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Major maps, atlas, and edited publications

1. Walker, D.A. and J.L. Peirce (eds.) 2015. Rapid Arctic Transitions due to Infrastructure and Climate (RATIC): A contribution to ICARP III. Alaska Geobotany Center Publication AGC 15-02. PDF
2. Walker, D.A., Raynolds, M.K., Buchhorn, M., Peirce, J.L. (eds.) 2014. Landscape and Permafrost Changes in the Prudhoe Bay Oilfield, Alaska. Alaska Geobotany Center Publication AGC 14-01. PDF. doi: 10.18739/A24X54H5D.
3. Walker, D.A., Hamilton, T.D., Ping, C.-L., Daanen, R.P., Streever, W.W. 2009. Dalton Highway Field Trip Guide for the Ninth International Conference on Permafrost. Division of Geological and Geophysical Surveys. Fairbanks, AK. 9. 117 . PDF - Print copy
4. Walker, D.A., Epstein, H.E., Welker, J.M. 2008. Introduction to special section on Biocomplexity of Arctic Tundra Ecosystems. Journal of Geophysical Research - Biogeosciences. 113:G03S00. PDF. doi: 10.1029/2008JG000740.
5. Walker, D.A., Maier, H.A. 2008. Vegetation in the Vicinity of the Toolik Lake Field Station, Alaska. Biological Papers of the University of Alaska, Institute of Arctic Biology. No. 28. - Map
6. Raynolds, M.K., Walker, D.A., Maier, H.A. 2006. Alaska Arctic Tundra Vegetation Map. 1:4,000,000. PDF
7. Walker, D.A., Elvebakk, A., Talbot, S.S., Daniels, F.J.A. 2005. The Second International Workshop on Circumpolar Vegetation Classification and Mapping: a tribute to Boris A. Yurtsev. Phytocoenologia. 35:715-725. PDF - Abstract. doi: 10.1127/0340-269X/2005/0035-0715.
8. CAVM Team 2003. Circumpolar Arctic Vegetation Map. 1:7,500,000. PDF
9. Walker, D.A., Hamilton, T.D., Balser, A.W., Anderson, J.A. 2003. Glacial Geology of Toolik Lake and the Upper Kuparuk River Region. University of Alaska Printing Services. Fairbanks, AK. 24 . PDF
10. NRC, Orians, G., Albert, T., Brown, G., Cameron, R., Cochran, P., Gerlach, S., Gramling, R., Gryc, G., Hite, D., Kennicutt II, M., Lachenbruch, A., Lowry, L., L., M., Pielou, C., Sedingr, J., Lindstedt-Siva, K.J., Speer, L., Walker, D.A., NAS, N.A.o.S.-., NRC, N.R.C.-. 2003. Cumulative Environmental Effects of Oil and Gas Activities on Alaska's North Slope. National Academies Press. Washington, D.C. 288 . PDF - Website
11. Jones, H.G., Pomeroy, J., Walker, D.A., Hoham, R.W. 2001. Snow Ecology. Cambridge University Press. Cambridge, UK. 378 .
12. Walker, D.A., Everett, K.R., Webber, P.J., Brown, J. 1980. Geobotanical Atlas of the Prudhoe Bay Region, Alaska. CRREL Report 80-14. 69. - PDF - 92MB

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Peer-reviewed book chapters

1. Frost, G.V., Bhatt, U.S., Epstein, H.E., Myers-Smith, I., Phoenix, G.K., Berner, L.T., Bjerke, J.W., Forbes, B.C., Goetz, S.J., Kerby, J.T., Macander, M.J., Park, T., Raynolds, M.K., Tømmervik, H. and Walker, D.A. 2021. Tundra greenness. in Arctic Report Card 2020. pp. 68-78. - Website. doi: 10.25923/46rm-0w23.
2. Epstein, H.E., Bhatt, U.S., Raynolds, M.K., Walker, D.A., Forbes, B.C., Horstkotte, T., Macias-Fauria, M., Martin, A., Phoenix, G., Bjerke, J., Tømmervik, Hl, Fauchald, P., Vickers, H., Myneni, R. and Dickerson, C. 2017. Tundra Greenness. in Arctic Report Card 2017. - Website
3. Romanovsky, V., Isaksen, K., Drozdov, D., Anisimov, O., Instanes, A., Leibman, M., et al. 2017. Changing permafrost and its impacts. in Snow, Water, Ice and Permafrost in the Arctic (SWIPA) 2018. - Website
4. Walker, D.A., Breen, A.L., Druckenmiller, L.A., Wirth, L.w., Fisher, W, Raynolds, M.K, Sibik, J., Walker, M.D., Hennekens, S., Boggs, K., Boucher, T., Buchhorn, M., Bültmann, H., Cooper, D.J., Daniëls, F.J.A., Davidson, S.J., Ebersole, J.J. et al. 2016. The Alaska Arctic Vegetation Archive (AVA-AK). Phytocoenologia 46:221-229. . doi: 10.1127/phyto/2016/0128.
5. Epstein, H.E., Bhatt, U.S., Raynolds, M.K., Walker, D.A., Bieniek, P.A., Tucker, C.J., Pinzon, J., Myers-Smith, I.H., Forbes, B.C., Macias-Fauria, M., Boelman, N.T. and Sweet, S.K. 2015. Tundra Greenness. in Arctic Report Card 2015. - Website
6. Epstein, H.E., Bhatt, U.S., Raynolds, M.K., Walker, D.A., Bieniek, P.A., Tucker C.J., Pinzon, J., Zeng, H., Jia, G.J., Guay, K.C. and Goetz, S.J. 2014. Tundra Greenness. in Arctic Report Card 2014. - Website
7. Walker, D.A., Hamilton, T.D., Munger, C. and Maier, H.A. 2014. Glacial history and long-term ecology in the Toolik Lake region. in A changing Arctic: Ecological consequence for tundra, streams and lakes. pp. 61-80.
8. Breen, A.L., Murray, D.F., Raynolds, M.K., Timling, I. and Walker, D.A. 2014. Ecology and evolution of plants in arctic and alpine environments. in Plant Ecology and Evolution in Harsh Environments. pp. 149-177. - Website
9. Ims, R.A., Ehrich, D., Forbes, B.C., Huntley, B., Walker, D.A., Wookey, P.A., Berteaux, D., Bhatt, U.S., Bråthen, K.A., Edwards, M.E., Epstein, H.E., Forchhammer, M.C., Fuglei, G. Gauthier, G. Gilbert, S., Leung, M., Menyushina, I.E., Ovsyanikov, N., Post, E., Raynolds, M.K., Reid, D.G., Schmidt, N.M., Stien, A., Sumina, O.I. and R. van der Wal 2013. Terrestrial ecosystems. in Arctic Biodiversity Assessment: Status and trends in Arctic biodiversity (pp. 385-440). pp. 385-440.
10. Goetz, S.J., Epstein, H.E., Alcaraz, J.D., Beck, P.S.A., Bhatt, U.S., Bunn, A., Comiso, J.C., Jia, G.J., Kaplan, J.O., Lilschke, H., Lloyd, A., Walker, D.A., Yu, Q. 2011. Recent changes in Arctic vegetation: Satellite observations and simulation model predictions. in Eurasian Arctic Land Cover and Land Use in a Changing Climate. pp. 9-36. PDF
11. Walker, D.A., Forbes, B.C., Leibman, M.O., Epstein, H.E., Bhatt, U.S., Comiso, J.C., Drozdov, D.S., Gubarkov, A.A., Jia, G.J., Karlejaärvi, E., Kaplan, J.O., Khumutov, V., Kofinas, G.P., Kumpula, T., Kuss, P., Moskalenko, N.G., Raynolds, M.K., Romanovsky, V.E., Stammler, F. and Yu, Q. 2011. Cumulative effects of rapid land-cover and land-use changes on the Yamal Peninsula, Russia. in Eurasian Arctic Land Cover and Land Use in a Changing Climate. pp. 206-236. PDF. doi: 10.1007/978-90-481-9118-5_9.
12. Walker, D.A., Hamilton, T.D., Walker, M.D., Balser, A.W., Maier, H.A., Munger, C.A. and Auerbach, N.A. 2006. Vegetation of the Toolik Lake region in relationship to glacial geology. in Toolik Lake LTER.
13. Walker, D.A., Billings, W.D., de Molenaar, J.G. 2001. Snow-vegetation interactions in tundra environments. in Snow Ecology. pp. 266-324. PDF - Google Books
14. Walker, M.D., Walker, D.A., Theodose, T.A., Webber, P.J. 2001. Vegetation: hierarchical species-environment relationships. in Structure and Function of an Alpine Ecosystem: Niwot Ridge, Colorado. pp. 99-127. PDF
15. Bockheim, J.G., D.A. Walker and Everett, L.R. 1997. Soil carbon distribution in nonacidic and acidic tundra of Arctic Alaska. in Soil processes and the carbon cycl. pp. 143-155. PDF
16. Walker, D.A. 1997. Arctic Alaskan vegetation disturbance and recovery: a hierarchic approach to the issue of cumulative impacts. in R.M.M. Crawford (eds.) Disturbance and Recovery in Arctic Lands. Kluwer Academic Publishers Publishers. Dordrecht. pp. 457-479. PDF - Purchase book
17. Duguay, C.R., Walker, D.A. 1996. Environmental modeling and monitoring with GIS: Niwot Ridge Long-Term Ecological Research Site. in GIS and Environmental Modeling: Progress and Research Issues. pp. 219-223.
18. Walker, D.A. 1996. Disturbance and recovery of Arctic Alaskan vegetation. in Landscape Function and Disturbance in Arctic Tundra (pp. 35-71). PDF - Purchase book
19. Walker, D.A. and Walker, M.D. 1996. Terrain and vegetation of the Imnavait Creek Watershed. in Landscape Function: Implications for Ecosystem Disturbance, a Case Study in Arctic Tundra. pp. 73-108. PDF - Purchase book
20. Walker, D.A. 1981. Prudhoe Bay, Alaska. in L.C. Bliss, O.W. Heal, J.J. Moore (eds.) Tundra ecosystems: a comparative analysis. Cambridge University Press. Cambridge, UK. pp. 766-676.

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Peer-reviewed articles

1. Bergstedt, H., Jones, B.M., Walker, D.A., Peirce, J., Bartsch, A., Pointner, G., Kanevskiy, M., Raynolds, M. and Buchhorn, M. 2022. The spatial and temporal influence of infrastructure and road dust on seasonal snowmelt, vegetation productivity, and early season surface water cover in the Prudhoe Bay Oilfield. Arctic Science. e-First. . doi: 10.1139/as-2022-0013.
2. Kanevskiy, M., Shur, Y., Walker, D.A., Jorgenson, M.T., Raynolds, M., Peirce, J., Jones, B., Buchhorn, M., Matyshak, G., Bergstedt, H., Breen, A., Connor, B., Daanen, R., Liljedahl, A., Romanovsky, V. and Watson-Cook, E. 2022. The shifting mosaic of ice-wedge degradation and stabilization in response to infrastructure and climate change, Prudhoe Bay Oilfield, Alaska. Arctic Science. 8:498-530. . doi: 10.1139/as-2021-0024.
3. Povoroznyuk, O., Vincent, W.F., Schweitzer, P., Laptander, R., Bennett, M., Calmels, F., Sergeev, D., Arp, C., Forbes, B.C., Roy-Léveillée, P., and Walker, D.A. 2022. Arctic roads and railways: social and environmental consequences of transport infrastructure in the circumpolar North. Arctic Science. e-First. . doi: 10.1139/as-2021-0033.
4. Walker, D.A., Raynolds, M.K., Kanevskiy, Shur, Y., Romanovsky, V.E., Jones, B.M., Buchhorn, M., Jorgenson, M.T., Sibik, J., Breen, A.L., Kade, A., Watson-Cook, E., Matyshak, G., Bergstedt, H., Liljedahl, A., Daanen, R., Connor, B., Nicolsky, D. and Peirce, J.L. 2022. Cumulative impacts of a gravel road and climate change in an ice-wedge polygon landscape, Prudhoe Bay, Alaska. Arctic Science. 8:1040-1066. . doi: 10.1139/as-2021-0014.
5. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Walsh, J.E., Bieniek, P.A., Cai, L., Comiso, J.C., Epstein, H.E., Frost, G.V., Gersten, R., Hendricks, A.S., Pinzon, J.E., Stock, L. and Tucker, C. 2021. Climate drivers of Arctic tundra variability and change using an indicators framework. Environmental Research Letters. 16:055019. . doi: 10.1088/1748-9326/abe676.
6. Frost, G.V., Macander, M.J., Bhatt, U.S., Epstein, H.E., Berner, L.T., Bjerke, J.W., Forbes, B.C., Goetz, S.J., Lara, M.J., Park, T., Phoenix, G.K., Raynolds, M.K., Tømmervik, H. and Walker, D. A. 2021. Tundra greenness [in "State of the Climate in 2020"]. Bulletin of the American Meteorological Society. 102(8):S297-S299. . doi: 10.1175/BAMS-D-21-0086.1.
7. Schneider von Deimling, T., Lee, H., Ingeman-Nielsen, T., Westermann, S., Romanovsky, V., Lamoureux, S., Walker, D.A., Chadburn, S., Trochim, E., Cai, L., Nitzbon, J., Jacobi, S. and Langer, M. 2021. Consequences of permafrost degradation for Arctic infrastructure - bridging the model gap between regional and engineering scales. The Cryosphere. 15:2451-2471. . doi: 10.5194/tc-15-2451-2021.
8. Frost, G.V., Bhatt, U.S., Epstein, H.E., Berner, L.T., Bjerke, J.W., Forbes, B.C., Goetz, S.J., Lara, M.J., Macander, M.J., Phoenix, G.K., Raynolds, M.K., Tømmervik, H. and Walker, D.A. 2020. Tundra greenness [in "State of the Climate in 2019"]. in Bulletin of the American Meteorological Society. 101(8):S272-S274. . doi: 10.1175/BAMS-D-20-0086.1.
9. Raynolds, M.K., Jorgenson, J.C., Jorgenson, M.T., Kanevskiy, M., Liljedahl, A.K., Nolan, M., Sturm, M. and Walker, D.A. 2020. Landscape impacts of 3D-seismic surveys in the Arctic National Wildlife Refuge, Alaska. Ecological Applications. 30(7):e02143. . doi: 10.1002/eap.2143.
10. Raynolds, M.K., Walker, D.A., Balser, A., Bay, C., Campbell, M., Cherosov, M.M., Daniëls, F.J.A., Eidesen, P.B., Ermokhina, K.A., Frost, G.V., et al. 2019. A raster version of the Circumpolar Arctic Vegetation Map (CAVM). Remote Sensing of Environment. 232:111297. . doi: 10.1016/j.rse.2019.111297.
11. Walker, D.A., Epstein, H.E., Sibik, J., Bhatt, U., Romanovsky, V.E., Breen, A.L., et al. 2019. Vegetation on mesic loamy and sandy soils along a 1700-km maritime Eurasia Arctic Transect. Applied Vegetation Science. 2019; 22:150-167. PDF. doi: 1111/avsc.12401.
12. Frost, G.V., Epstein H.E., Walker, D.A., Matyshak G., & Ermokhina, K. 2018. Seasonal and Long-Term Changes to Active-Layer Temperatures after Tall Shrubland Expansion and Succession in Arctic Tundra. Ecosystems. 21:507-520. . doi: 10.1007/s10021-017-0165-5.
13. Reichle, L.M., Epstein, H.E., Bhatt, U.S., Raynolds, M.K. and Walker, D.A. 2018. Spatial Heterogeneity of the Temporal Dynamics of Arctic Tundra Vegetation. Geophysical Research Letters. 45:9206-9215. . doi: 10.1029/2018GL078820.
14. Walker, D.A., Daniëls, F.J.A., Matveyeva, N.V., Sibik, J., Walker, M.D., Breen, A.L., Druckenmiller, L.A., Raynolds, M.K. & (...) Wirth, L.M. 2018. Circumpolar Arctic Vegetation Classification. Phytocoenologia. 48:181-201. PDF. doi: 10.1127/phyto/2017/0192.
15. Walker, D.A., Shur, Y., Kanevskiy, M., Raynolds, M., Kofinas, G., Romanovsky, V., et al. 2018. Cumulative effects of oilfield infrastructure and climate change in the Prudhoe Bay Oilfield, Alaska, illustrate the need for an international strategy to address rapid arctic transitions due to infrastructure and climate. Frontiers in Ecology and the Environment. submitted.
16. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Comiso, J.C., Pinzon, J.E., Tucker, C.J., Steele, M.A., Ermold, W. and Zhang, J. 2017. Changing seasonality of Pan-Arctic tundra vegetation in relation to climatic variables. Environmental Research Letters. 12:055003. . doi: 1088/1748-9326/aa6b0b.
17. Bratsch, S.N., Epstein, H.E., Buchhorn, M., Walker, D.A. and Landes, H.A. 2017. Relationships between hyperspectral data and components of vegetation biomass in Low Arctic tundra communities at Ivotuk, Alaska. Environmental Research Letters. 12:025003.
18. Frost, G.V., Epstein, H.E., Walker, D.A., Matyshak, G. and Ermokhina, K. 2017. Seasonal and long-term changes to active-layer temperatures after tall shrubland expansion and succession in arctic tundra. Ecosystems. 16, 1296. . doi: 1007/s10021-017-0165-5.
19. Kanevskiy, M., Shur, Y., Jorgensen, T., Brown, D.R.N., Moskalenko, N., Brown, J., Walker, D.A., Raynolds, M.K. & Buchhorn, M. 2017. Degradation and stabilization of ice wedges: Implications for assessing risk of thermokarst in northern Alaska. Geomorphology. 297:20-42. . doi: 10.1016/j.geomorph.2017.09.001.
20. Yu, Q., Epstein, H., Engstrom, R. and Walker, D. 2017. Circumpolar arctic tundra biomass and productivity dynamics in response to projected climate change and herbivory. Global Change Biology. 23:3895–3907. . doi: 1111/gcb.13632.
21. Bratsch, S.N., Epstein, H.E., Buchhorn, M. and Walker, D.A. 2016. Differentiating among Four Arctic Tundra Plant Communities at Ivotuk, Alaska Using Field Spectroscopy. Remote Sensing. 8(1):51. . doi: 10.3390/rs8010051.
22. Frost, G.V., Epstein, H.E., Walker, D.A. and Matyshak, G. 2016. Changes to active-layer temperature after tall shrub expansion in arctic tundra. Ecosystems. in prep.
23. Liljedahl A.K., Boike, J., Daanen, R.P., Fedorov, A.N., Frost, G.V., Grosse, G., Hinzman, L.D., Iijma, Y., Jorgenson, J.C., Matveyeva, N., Necsoiu, M., Raynolds, M.K., Romanovsky, V.E., Jörg Schulla, Tape, K.D., Walker, D.A., Wilson, C.J., Yabuki, H. and Zona, D. 2016. Pan-Arctic ice-wedge degradation in warming permafrost and its influence on tundra hydrology. Nature Geoscience. 9:312-318. . doi: 10.1038/NGEO2674.
24. Raynolds, M.K. and Walker, D.A. 2016. Increased wetness confounds Landsat-derived NDVI trends in the central Alaska North Slope region, 1985–2011. Environmental Research Letters. 11:085004. . doi: 10.1088/1748-9326/11/8/085004.
25. Walker, D.A., Daniëls, F.J.A., Alsos, I., Bhatt, U.S., Breen, A.L., Buchhorn, M., Bültmann, H., Druckenmiller, L.A., Edwards, M.E., Ehrich, D., Epstein, H.E., Gould, W.A., Ims, R.A., Meltofte, H., Raynolds, M.K., Sibik, J., Talbot, S.S. and Webber, P.J. 2016. Circumpolar arctic vegetation: A hierarchic review and roadmap toward an internationally consistent approach to survey, archive and classify tundra plot data. Environmental Research Letters. 11:055005. . doi: 10.1088/1748-9326/11/5/055005.
26. Bieniek, P.A, Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Pinzon, J.E., Tucker, C.J., Thoman, R.L. & (...) Ermold, W. 2015. Climate drivers linked to changing seasonality of Alaska coastal tundra vegetation productivity. Earth Interactions. 19:1-29. . doi: 1175/EI-D-15-0013.1.
27. De Cáceres, M., Chytrý, M., Agrillo, E., Attorre, F., Botta-Dukát, Z., Capelo, J., Czúcz, B., Dengler, J., Ewald, J., Faber-Langendoen, D., Feoli, E., Franklin, S.B., Gavilán, R., Gillet, F., Jansen, F., Jiménez-Alfaro, B., Krestov, P., Landucci, F., Lengyel, A., Loidi, J., Mucina, L., Peet, R.K., Roberts, D.W., Role?ek, J., Schaminée, J.H.J., Schmidtlein, S., Theurillat, J.-P., Tichý, L., Walker, D.A., Wildi, O., Willner, W., Wiser, S.K. 2015. A comparative framework for broad-scale plot-based vegetation classification. Applied Vegetation Science. 18:543-560. . doi: 10.1111/avsc.12179.
28. Epstein, H.E., Frost, G.V., Walker, D.A. and R. Kwok, R. 2015. [The Arctic] Declassified high-resolution visible imagery for observing the Arctic [in "State of the Climate in 2014"]. Bulletin of the American Meteorological Society. 96:S142-S143. . doi: 10.1175/2013BAMSStateoftheClimate.1.
29. Matyshak, G.V., Goncharova, O.Y., Walker, D.A., Epstein, H.E., Moskalenko, N.G., and Shur, Y. 2015. Contrasting soil thermal regimes in the forest-tundra transition near Nadym, West Siberia, Russia. Permafrost and Periglacial Processes. 10.1002/ppp.1882.
30. Bhatt, U.S., Walker, D.A., Walsh, J.E., Carmack, E.C., Frey, K.E., Meier, W.N., Moore, S.E., Parmentier, F.W., Post, E., Romanovsky, V.E. and Simpson, W.R. 2014. Implications of Arctic Sea Ice Decline for the Earth System. Annual Review of Environment and Resources. 39:57-89. PDF - Supplemental Materials. doi: 10.1146/annurev-environ-122012-094357.
31. Frost, G. V., Epstein, H. E. and Walker, D. A. 2014. Regional and landscape-scale variability of Landsat-observed vegetation dynamics in northwest Siberian tundra. Environmental Research Letters. 9(2) 025004. . doi: 1088/1748-9326/9/2/025004.
32. Raynolds, M. K., Walker, D. A., Ambrosius, K. J., Brown, J., Everett, K. R., Kanevskiy, M., et al. 2014. Cumulative geoecological effects of 62 years of infrastructure and climate change in ice-rich permafrost landscapes, Prudhoe Bay Oilfield, Alaska. Global Change Biology. 20(4):1211-1224. . doi: 10.1111/gcb.12500.
33. Timling, I., Walker, D. A., Nusbaum, C., Lennon, N. J. and Taylor, D. L. 2014. Rich and cold: Diversity, distribution and drivers of fungal communities in patterned-ground ecosystems of the North American Arctic. Molecular Ecology. 23: 3258–3272. . doi: 1111/mec.12743.
34. Bhatt, U., Walker, D., Raynolds, M., Bieniek, P., Epstein, H., Comiso, J., et al. 2013. Recent Declines in Warming and Vegetation Greening Trends over Pan-Arctic Tundra. Remote Sensing. 5(9):4229-4254. . doi: 10.3390/rs5094229.
35. Epstein, H.E., Myers-Smith, I., & Walker, D.A. 2013. Recent dynamics of arctic and sub-arctic vegetation. Environmental Research Letters. 8(1), 015040. . doi: 10.1088/1748-9326/8/1/015040.
36. Frost, G. V., Epstein, H. E., Walker, D. A., Matyshak, G., & Ermokhina, K. 2013. Patterned-ground facilitates shrub expansion in Low Arctic tundra. Environmental Research Letters. 8(1), 015035. . doi: 10.1088/1748-9326/8/1/015035.
37. Walker, D.A., Bay, C., Breen, A.L., Bültmann, H., Christiansen, T., Damgaard, C., Daniëls, F.J.A., Hennekens, S.M., Luoto, M., Pellisier, L., Peet, R.K., Schmidt, N.-M., Yoccoz, N.G., Wisz, M.S. 2013. Rescuing valuable Arctic vegetation data for biodiversity and ecosystem models: CBIO-NET—IAVD workshop, Roskilde, Denmark, 29-31 May 2012. Arctic. 68(1):133-138. PDF
38. Epstein, H.E., Raynolds, M.K., Walker, D.A., Bhatt, U.S., Tucker, C.J., Pinzon, J.E. 2012. Dynamics of aboveground phytomass of the circumpolar arctic tundra during the past three decades. Environmental Research Letters. 7(1):12. PDF. doi: 10.1088/1748-9326/7/1/015506.
39. Kelley, A.M., Epstein, H.E., Ping, C.-L., Walker, D.A. 2012. Soil nitrogen transformations associated with small patterned-ground features along a North American Arctic transect. Permafrost and Periglacial Processes. 23:196-206. PDF. doi: 10.1002/ppp.1748.
40. Masson-Delmotte, V., Swingedouw, D., Landais, A., Siedenkrantz, M.-S., Gauthier, E., Bichet, V., Massa, C., Perren, B., Jomelli, V., Adalgeirsdottir, G., Christensen, J., Arneborg, J., Bhatt, U.S., Walker, D.A., Elberling, B., Gillet-Chaulet, F., Ritz, C., Gallee, H., van den Broeke, M., Fettweis, X., de Vernal, A. 2012. Greenland climate change: from the past to the future. Climate Change. draft:(unk):45. PDF. doi: 10.1002/wcc.186.
41. Michaelson, G.J., Ping, C.-L., Walker, D.A. 2012. Soils associated with biotic activity on frost boils in Arctic Alaska. Soil Science Society of America Journal. 76:2265. PDF
42. Raynolds, M.K., Walker, D.A., Epstein, H.E., Pinzon, J.E., Tucker, C.J. 2012. A new estimate of tundra-biome phytomass from trans-Arctic field data and AVHRR NDVI. Remote Sensing Letters. 3:403-411. PDF. doi: 10.1080/01431161.2011.609188.
43. Raynolds, M.K., Walker, D.A., Verbyla, D., Munger, C.A. 2012. Patterns of change within a tundra landscape: 22-year Landsat NDVI trends in an area of the northern foothills of the Brooks Range, Alaska. Arctic, Antarctic, and Alpine Research.
44. Timling, I., Walker, D.A., Gardes, M., Charcosset, J.Y., Welker, J.A., Taylor, D.L. 2012. Distribution and drivers of ectomycorrhizal fungal communities across the North American Arctic. Ecosphere. 3:1-25. PDF
45. Walker, D.A., Bhatt, U.S., Epstein, H.E., Bieniek, P.A., Comiso, J.C., Frost, G.V., Pinzon, J., Raynolds, M.K., Tucker, C.J. 2012. [The Arctic] Changing Arctic tundra vegetation biomass and greenness [in "State of the Climate in 2011"]. Bulletin of the American Meteorological Society. 93(7):S138-139. PDF. doi: 10.1175/2012BAMSStateoftheClimate.1.
46. Walker, D.A., Epstein, H.E., Raynolds, M.K., Kuss, P., Kopecky, M.A., Frost, G.V., Daniëls, F.J.A., Leibman, M.O., Moskalenko, N.G., Matyshak, G.V., Khitun, O.V., Khomutov, A.V., Forbes, B.C., Bhatt, U.S., Kade, A.N., Vonlanthen, C.M., Tichy, L. 2012. Environment, vegetation and greenness (NDVI) along the North America and Eurasia Arctic transects. Environmental Research Letters. 7(1). PDF. doi: 10.1088/1748-9326/7/1/015504.
47. Blinnikov, M.S., Gaglioti, B., Walker, D.A., Wooler, M.J., Zazula, G.D. 2011. Pleistocene graminoid-dominated ecosystems in the Arctic. Quaternary Science Reviews. 30:2906-2929. PDF. doi: 10.1016/j.quascirev.2011.07.002.
48. Walker, D.A., Bhatt, U.S., Callaghan, T.V., Comiso, J.C., Epstein, H.E., Forbes, B.C., Gill, M., Gould, W.A., Henry, G.H.R., Jia, G.J., Kokelj, S.V., Lantz, T.C., Oberbauer, S.F., Pinzon, J.E., Raynolds, M.K., Shaver, G.R., Tucker, C.J., Tweedie, C.E., Webber, P.J. 2011. [The Arctic] Land: Vegetation [in "State of the Climate in 2010"]. Bulletin of the American Meteorological Society. 92:S150-S152. - Website. doi: 10.1175/1520-0477-92.6.S1.
49. Walker, D.A., Kuss, H.P., Epstein, H.E., Kade, A.N., Vonlanthen, C., Raynolds, M.K., Daniëls, F.J.A. 2011. Vegetation of zonal patterned-ground ecosystems along the North American Arctic Transect. Applied Vegetation Science. 14:440-463. PDF
50. Yu, Q., Epstein, H.E., Walker, D.A., Frost, G.V., Forbes, B. 2011. Modeling dynamics of tundra plant communities on the Yamal Peninsula, Russia, in response to climate change and grazing pressure. Environmental Research Letters. 6(4). PDF. doi: 10.1088/1748-9326/6/4/045505.
51. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Jia, G.J., Gens, R., Pinzon, J.E., Tucker, C.J., Tweedie, C.E., Webber, P.J. 2010. Circumpolar Arctic tundra vegetation change is linked to sea-ice decline. Earth Interactions. 14:(8):1-20. PDF
52. Gould, W.A., Gonzalez, G., Walker, D.A., Ping, C.L. 2010. Commentary. Integrating research, education, and traditional knowledge in ecology: a case study of biocomplexity in Arctic ecosystems. Arctic, Antarctic, and Alpine Research. 42:(4):379-384. PDF
53. Walker, D.A., Bhatt, U.S., Comiso, J.C., Epstein, H.E., Gould, W.A., Henry, G.H.R., Jia, G.J., Kokelj, S.V., Lantz, T.C., Mercado-Diaz, J.A., Pinzon, J.E., Raynolds, M.K., Shaver, G.R., Tucker, C.J., Tweedie, C.E., Webber, P.J. 2010. [The Arctic] Land: Vegetation [in "State of the Climate in 2009"]. Bulletin of the American Meteorological Society. 91(7):S115-S116. PDF - Website. doi: 10.1175/BAMS-91-7-StateoftheClimate.
54. *Walker, D.A., Raynolds, M.K., Maier, H.A., Barbour, E.M., Neufeld, G.P. 2010. Circumpolar geobotanical mapping: a web-based plant-to-planet approach for vegetation-change analysis in the Arctic. Viten. 1:125-128. PDF - Conference Website
55. Walker, D.A., Walker, M.D., Gould, W.A., Mercado, J., Auerbach, N.A., Maier, H.A., Neufeld, G.P. 2010. Maps for monitoring changes to vegetation structure and composition: The Toolik and Imnavait Creek grid plots. Viten. 1:121-123. PDF - Conference Website
56. Groisman, P.Y., Clark, E.A., Kattsov, V.M., Lettenmaier, D.P., Sokolik, I.N., Aizen, V.B., Cartus, O., Chen, J., Conard, S., Katzenberger, J., Krankina, O., Kukkonen, J., Machida, T., Maksyutov, S., Ojima, D., Qi, J., Romanovsky, V.E., Santoro, M., Schmullius, C.C., Shiklomanov, A.I., Shimoyama, K., Shugart, H.H., Shuman, J.K., Sofiev, M.A., Sukhinin, A.I., Vorosmarty, C., Walker, D.A., Wood, E.F. 2009. The Northern Eurasia Earth Science Partnership: An example of Science Applied to Societal Needs. Bulletin of the American Meteorological Society. 90:671-688. PDF. doi: 10.1175/2008BAMS2556.1.
57. Jia, G.J., Epstein, H.E., Walker, D.A. 2009. Vegetation greening in the Canadian Arctic related to decadal warming. Journal of Environmental Monitoring. 11:2231-2238. - Purchase PDF. doi: 10.1039/B911677J.
58. Raynolds, M.K., Walker, D.A. 2009. Effects of deglaciation on circumpolar distribution of arctic vegetation. Canadian Journal of Remote Sensing. 35:(2):118-129. PDF - Permanent link
59. Walker, D.A., Bhatt, U.S., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Jia, G.J. 2009. [The Arctic] Land: Vegetation [in "State of the Climate in 2008"]. Bulletin of the American Meteorological Society. 90(8):S104-S105. PDF - Website. doi: 10.1175/BAMS-90-8-StateoftheClimate.
60. Walker, D.A., Leibman, M.O., Epstein, H.E., Forbes, B.C., Bhatt, U.S., Raynolds, M.K., Comiso, J., Gubarkov, A.A., Khomutov, A.V., Jia, G.J., Kaarlejärvi, E., Kaplan, J.O., Kumpula, T., Kuss, H.P., Matyshak, G., Moskalenko, N.G., Orechov, P., Romanovsky, V.E., Ukraientseva, N.K., Yu, Q. 2009. Spatial and temporal patterns of greenness on the Yamal Peninsula, Russia: interactions of ecological and social factors affecting the Arctic normalized difference vegetation index. Environmental Research Letters. 4:16. PDF. doi: 10.1088/1748-9326/4/4/045004.
61. Daanen, R., Romanovsky, V., Walker, D., LaDouceur, M. 2008. High resolution, surface and subsurface survey of a non-sorted circle system. Ninth International Conference on Permafrost. Fairbanks, AK, June 29 - July 3. 1:321-326. PDF - Session 1P-9-62
62. Daanen, R.P., Misra, D., Epstein, H., Walker, D., Romanovsky, V. 2008. Simulating nonsorted circle development in arctic tundra ecosystems. Journal of Geophysical Research - Biogeosciences. 113:1-10. PDF. doi: 10.1029/2008JG000682.
63. Epstein, H.E., Walker, D.A., Raynolds, M.K., Jia, G.J., Kelley, A.M. 2008. Phytomass patterns across a temperature gradient of the North American arctic tundra. Journal of Geophysical Research - Biogeosciences. 113:1-11. PDF - Permanent link
64. Kade, A., Walker, D.A. 2008. Experimental alteration of vegetation on nonsorted circles: effects on cryogenic activity and implications for climate change in the Arctic. Arctic, Antarctic, and Alpine Research. 40(1):96-103. PDF - Abstract. doi: 10.1657/1523-0430(06-029)[KADE]2.0.CO;2.
65. Leibman, M.O., Epstein, H.E., Khomutov, A.V., Moskalenko, N.G., Walker, D.A. 2008. Relation of active layer depth to vegetation on the central Yamal Peninsula, Russia. Ninth International Conference on Permafrost. Fairbanks, AK, June 29-July 3. Extended Abstracts 2:177-178. PDF - Session 2P-4-43
66. Michaelson, G.J., Ping, C.L., Epstein, H., Kimble, J.M., Walker, D.A. 2008. Soils and frost boil ecosystems across the North American Arctic Transect. Journal of Geophysical Research - Biogeosciences. 113:G03S11, 10.1029/2007JG000672. PDF - Abstract. doi: 10.1029/2007JG000672.
67. Munger, C.A., Walker, D.A., Maier, H.A., Hamilton, T.D. 2008. Spatial analysis of glacial geology, surficial geomorphology, and vegetation in the Toolik Lake region: Relevance to past and future land-cover changes. Ninth International Conference on Permafrost. Fairbanks, AK June 29 - July 3. 2:1255-1260. PDF
68. Nicolsky, D.J., Romanovsky, V.E., Tipenko, G.S., Walker, D.A. 2008. Modeling biogeophysical interactions in nonsorted circles in the Low Arctic. Journal of Geophysical Research - Biogeosciences. 113:1-17. PDF - Abstract. doi: 10.1029/2007JG000565.
69. Nicolsky, D.J., Romanovsky, V.E., Tipenko, G.S., Walker, D.A. 2008. Modeling observed differential frost heave within non-sorted circles in Alaska. Ninth International Conference on Permafrost. Fairbanks, AK, June 29-July 3. 2:1281-1286. - Session 3P-6-54
70. Ping, C.-L., Michaelson, G.J., Jorgenson, M.T., Kimble, J.M., Epstein, H., Romanovsky, V.E., Walker, D.A. 2008. High stocks of soil organic carbon in North American Arctic region. Nature Geoscience. 1:615-619. PDF - Abstract. doi: 10.1038/ngeo284.
71. Ping, C.-L., Michaelson, G.J., Kimble, J.M., Romanovsky, V.E., Shur, Y.L., Swanson, D.K., Walker, D.A. 2008. Cryogenesis and soil formation along a bioclimate gradient in Arctic North America. Journal of Geophysical Research - Biogeosciences. 113:G03S12. PDF. doi: 10.1029/2008JG000744.
72. Raynolds, M.K., Comiso, J.C., Walker, D.A., Verbyla, D. 2008. Relationship between satellite-derived land surface temperatures, arctic vegetation types, and NDVI. Remote Sensing of Environment. 112(4):1884-1894. PDF. doi: 10.1016/j.rse.2007.09.008.
73. Raynolds, M.K., Walker, D.A. 2008. Circumpolar relationships between permafrost characteristics, NDVI, and arctic vegetation types. Ninth International Conference on Permafrost. Fairbanks, AK, June 29-July 3. 2:1469-1474. PDF
74. Raynolds, M.K., Walker, D.A., Munger, C.A., Vonlanthen, C.M., Kade, A.N. 2008. A map analysis of patterned-ground along a North American Arctic Transect. Journal of Geophysical Research - Biogeosciences. 113:1-18. PDF - Abstract. doi: 10.1029/2007JG000512.
75. Romanovsky, V.E., Marchenko, S.S., Daanen, R., Sergeev, D.O., Walker, D.A. 2008. Soil climate and frost heave along the permafrost/ecological North American Arctic transect. Ninth International Conference on Permafrost. Fairbanks, AK, June 28-July3. 2:1519-1524. PDF
76. Vonlanthen, C.M., Walker, D.A., Raynolds, M.K., Kade, A., Kuss, H.P., Daniëls, F.J.A., Matveyeva, N.V. 2008. Patterned-ground plant communities along a bioclimate gradient in the High Arctic, Canada. Phytocoenologia. 38:23-63. PDF - Abstract. doi: 10.1127/0340-269X/2008/0038-0023.
77. Walker, D.A., Barbour, E.M., Maier, H.A. 2008. A Web-based Arctic Geobotanical Atlas and a New Hierarchy of Maps of the Toolik Lake Region, Alaska. Ninth International Conference on Permafrost. Fairbanks, AK, June 29 - July 3. 2:1893-1898. PDF
78. Walker, D.A., Epstein, H.E., Romanovsky, V.E., Ping, C.L., Michaelson, G.J., Daanen, R.P., Shur, Y., Peterson, R.A., Krantz, W.B., Raynolds, M.K., Gould, W.A., Gonzalez, G., Nicolsky, D.J., Vonlanthen, C.M., Kade, A.N., Kuss, P., Kelley, A.M., Munger, C.A., Tarnocai, C.T., Matveyeva, N.V., Daniëls, F.J.A. 2008. Arctic patterned-ground ecosystems: A synthesis of field studies and models along a North American Arctic Transect. Journal of Geophysical Research - Biogeosciences. 113:G03S01. PDF. doi: 10.1029/2007JG000504.
79. Walker, D.A., Raynolds, M.K., Gould, W.A. 2008. Fred Daniëls, Subzone A, and the North American Arctic Transect. Abhandlungen aus dem Westfälischen Museum für Naturkunde. 70:(3/4):387-400. PDF
80. Jia, G.J., Epstein, H.E., Walker, D.A. 2006. Spatial heterogeneity of tundra vegetation response to recent temperature changes. Global Change Biology. 12:42-55. PDF. doi: 10.1111/j.1365-2486.2005.01079.x.
81. Kade, A., Romanovsky, V.E., Walker, D.A. 2006. The N-factor of nonsorted circles along a climate gradient in Arctic Alaska. Permafrost and Periglacial Processes. 17(4):279-289. PDF. doi: 10.1002/ppp.563.
82. Raynolds, M.K., Walker, D.A., Maier, H.A. 2006. NDVI patterns and phytomass distribution in the circumpolar Arctic. Remote Sensing of Environment. 102:271-281. PDF. doi: 10.1016/j.rse.2006.02.016.
83. Richter-Menge, J., Overland, J., Proshutinsky, A., Romanovsky, V., Bengtsson, L., Brigham, L., Dyurgerov, M., Gascard, J.C., Gerland, S., Graversen, R., Hass, C., Karcher, M., Kuhry, P., Maslanik, J., Melling, H., Maslowski, W., Morison, J., Perovich, D., Przybylak, R., Rachold, V., Rigor, I., Shiklomanov, A., Stroeve, J., Walker, D., Walsh, J. 2006. State of the Arctic Report. NOAA/OAR/PMEL. Seattle, WA. NOAA OAR Special Report(2952). 36 . PDF - State of the Arctic
84. Zhurbenko, M.P., Matveeva, N.V., Vonlanthen, C., Walker, D.A., Raynolds, M.K. 2006. Lichens from Ellef Ringnes Island, Canadian Arctic Archipelago. Evansia. 23:(3):69-78. PDF
85. Chapin, F.S.I., Sturm, M., Serreze, M.C., McFadden, J.P., Key, J.R., Lloyd, A.H., McGuire, A.D., Rupp, T.S., Lynch, A.H., Schimel, J.P., Beringer, J., Chapman, W.L., Epstein, H.E., Euskirchen, E.S., Hinzman, L.D., Jia, G., Ping, C.-L., Tape, K.D., Thompson, C.D.C., Walker, D.A., Welker, J.M. 2005. Role of land-surface changes in Arctic summer warming. Science. 310:(5748):657-660. PDF - Permanent link
86. Hinzman, L.D., Bettez, N.D., Bolton, W.R., Chapin, F.S., III, Dyurgerov, M.B., Fastie, C.L., Griffith, B., Hollister, R.D., Hope, A., Huntington, H.P., Jensen, A., Jia, G.J., Jorgenson, T., Kane, D.L., Klein, D.R., Kofinas, G., Lynch, A.H., Lloyd, A.H., McGuire, A.D., Nelson, F., Oechel, W.C., Osterkamp, T.E., Racine, H.C., Romanovsky, V.E., Stone, R., Stow, D.A., Sturm, M., Tweedie, C.E., Vourlitis, G.L., Walker, M.D., Walker, D.A., Webber, P.J., Welker, J.M., Winker, K.S., Yoshikawa, K. 2005. Evidence and implications of recent climate change in northern Alaska and other Arctic regions. Climatic Change. 72:251-298. PDF - Abstract. doi: 10.1007/s10584-005-5352-2.
87. Kade, A., Walker, D.A., Raynolds, M.K. 2005. Plant communities and soils in cryoturbated tundra along a bioclimate gradient in the Low Arctic, Alaska. Phytocoenologia. 35:761-820. PDF - Abstract
88. Ping, C.-L., Michaelson, G.J., Kimble, J.M., Walker, D.A. 2005. Soil acidity and exchange properties of cryogenic soils in Arctic Alaska. Journal of Soil Science and Plant Nutrition. 51(5):649-653. PDF - Abstract. doi: 10.1111/j.1747-0765.2005.tb00083.x.
89. Raynolds, M.K., Walker, D.A., Maier, H.A. 2005. Plant community-level mapping of arctic Alaska based on the Circumpolar Arctic Vegetation Map. Phytocoenologia. 35:821-848. PDF - Abstract. doi: 10.1127/0340-269X/2005/0035-0821.
90. Riedel, S.M., Epstein, H.E., Walker, D.A. 2005. Biotic controls over spectral reflectance of arctic tundra vegetation. International Journal of Remote Sensing. 26(11):2391-2405. PDF. doi: 10.1080/01431160512331337754.
91. Riedel, S.M., Epstein, H.E., Walker, D.A., Richardson, D.L., Calef, M.P., Edwards, E., Moody, A. 2005. Spatial and temporal heterogeneity of vegetation properties among four tundra plant communities at Ivotuk, Alaska, USA. Arctic, Antarctic, and Alpine Research. 37(1):25-33. PDF. doi: 10.1657/1523-0430(2005)037[0025:SATHOV]2.0.CO;2.
92. Walker, D.A., Raynolds, M.K., Daniëls, F.J.A., Einarsson, E., Elvebakk, A., Gould, W.A., Katenin, A.E., Kholod, S.S., Markon, C.J., Melnikov, E.S., N.G., M., Talbot, S.S., Yurtsev, B.A., CAVM Team 2005. The Circumpolar Arctic Vegetation Map. Journal of Vegetation Science. 16(3):267-282. PDF. doi: 10.1658/1100-9233(2005)016[0267:TCAVM]2.0.CO;2.
93. Zhurbenko, M.P., Laursen, G.A., Walker, D.A. 2005. New and rare lichenicolous fungi and lichens from the North American Arctic. Mycotaxon. 92:201-212. PDF - Abstract
94. Zhurbenko, M.P., Raynolds, M.K., Walker, D.A., Matveeva, N.V. 2005. Lichens and lichenicolous fungi from the Kolyma delta region, Russian Arctic. Graphis Scripta. 17:27-29. PDF
95. Epstein, H.E., Beringer, J., Copass, C., Gould, W., Lloyd, A., Chapin III, F.S., Ping, C.L., Michaelson, G., Rupp, S., Walker, D.A. 2004. The nature of spatial transitions in arctic ecosytems. Journal of Biogeography. 31:1917-1933. PDF - Abstract. doi: 10.1111/j.1365-2699.2004.01140.x.
96. Jia, G.J., Epstein, H.E., Walker, D.A. 2004. Controls over intra-seasonal dynamics of AVHRR NDVI for the Arctic tundra in northern Alaska. International Journal of Remote Sensing. 25(9):1547-1564. PDF. doi: 10.1080/0143116021000023925.
97. Kelley, A.M., Epstein, H., Walker, D.A. 2004. Role of vegetation and climate in permafrost active layer depth in arctic tundra of Northern Alaska and Canada. Journal of Glaciology and Climatology. 26:269-273. PDF
98. Stow, D.A., Hope, A., D., M., Verbyla, D., Gamon, J., Huemmrich, F., Houston, S., Racine, C., Sturm, M., Tape, K., Hinzman, L., Yoshikawa, K., Tweedie, C., Noyle, B., Silapaswan, C., Douglas, D., Griffith, B., Jia, G., Epstein, H., Walker, D., Daeschner, S., Petersen, A., Zhou, L., Myneni, R. 2004. Remote sensing of vegetation and land-cover change in arctic tundra ecosystems. Remote Sensing of Environment. 89:281-308. PDF - Abstract. doi: 10.1016/j.rse.2003.10.018.
99. Walker, D.A., Epstein, H.E., Gould, W.A., Kelley, A.M., Kade, A.N., Knudson, J.A., Krantz, W.B., Michaleson, G., Peterson, R.A., Ping, C.L., Raynolds, M.K., Romanovsky, V.E., Shur, Y.L. 2004. Frost-boil ecosystems: complex interactions between landforms, soils, vegetation, and climate. Permafrost and Periglacial Processes. 15(2):171-188. PDF - Abstract. doi: 10.1002/ppp.487.
100. Bigelow, N.H., Brubaker, L.B., Edwards, M.E., Harrison, S.E., Prentice, I.C., Anderson, P.M., Andreev, A.A., Bartlein, P.J., Christensen, T.R., Cramer, W., Kaplan, J.O., Lozhkin, A.V., Matveyeva, N.V., Murray, D.F., McGuire, A.D., Razzhivin, Y.Y., Ritchie, J.C., Smith, B., Walker, D.A., Gajewski, K., Wolf, V., Holmqvist, B.H., Igarashi, Y., Kremenetskii, K.V., Paus, A., Pisaric, M.F.J., Volkova, V.S. 2003. Climate change and Arctic ecosystems I: Vegetation changes north of 55° N between the last glacial maximum, mid-Holocene and present. Journal of Geophysical Research. 108(D19). PDF. doi: 10.1029/2002JD002558.
101. Gould, W.A., Raynolds, M.A., Walker, D.A. 2003. Vegetation, plant biomass, and net primary productivity patterns in the Canadian Arctic. Journal of Geophysical Research. 108(D2):1-14. PDF - Abstract. doi: 10.1029/2001JD000948.
102. Gould, W.A., Walker, D.A., Biesboer, D. 2003. Combining research and education: Bioclimatic Zonation along a Canadian Arctic Transect. Arctic. 56:(1):45-54. PDF - Abstract
103. Jia, G.J., Epstein, H.E., Walker, D.A. 2003. Greening of arctic Alaska, 1981-2001. Geophysical Research Letters. 30(20):1-4. PDF - Abstract. doi: 10.1029/2003GL018268.
104. Kaplan, J.O., Bigelow, N.H., Prentice, I.C., Harrison, S.P., Bartlein, P.J., Christensen, T.R., Cramer, W., Matveyeva, N.V., McGuire, A.D., Murray, D.F., Razzhivin, V.Y., Smith, B., Walker, D.A., Anderson, P.M., Andreev, A.A., Brubaker, L.B., Edwards, M.E., Lozhkin, L.V. 2003. Climate change and Arctic ecosystems II: Modeling, paleodata-model comparisons, and future projections. Journal of Geophysical Research. 108 (D19). PDF - Abstract. doi: 10.1029/2002JD002559.
105. Peterson, R.A., Walker, D.A., Romanovsky, V.E., Knudson, J.A., Raynolds, M.K., Krantz, W.B. 2003. A differential frost heave model: cryoturbation-vegetation interactions. Proceedings of the Eighth International Conference on Permafrost. Lisse, 21-25 July. 2:885-890. PDF - Complete set of PDFs
106. Walker, D.A., Epstein, H.E., Jia, J.G., Balser, A.W., Copass, C., Edwards, E.J., Gould, W.A., Hollingsworth, J., Knudson, J., Maier, H.A., Moody, A., Raynolds, M.K. 2003. Phytomass, LAI, and NDVI in northern Alaska: Relationships to summer warmth, soil pH, plant functional types, and extrapolation to the circumpolar Arctic. Journal of Geophysical Research - Atmospheres. 108(d2):8169. PDF - Abstract. doi: 10.1029/2001JD000986.
107. Walker, D.A., Jia, G.J., Epstein, H.E., Raynolds, M.K., Chapin , F.S., III, Copass, C.D., Hinzman, L.D., Knudson, J.A., Maier, H.A., Michaelson, G.J., Nelson, F., Ping, C.L., Romanovsky, V.E., Shiklomanov, N. 2003. Vegetation-soil-thaw-depth relationships along a low-arctic bioclimate gradient, Alaska: synthesis of information from the ATLAS studies. Permafrost and Periglacial Processes. 14(2):103-123. PDF - Abstract. doi: 10.1002/ppp.452.
108. Walker, D.A., Raynolds, M.A., Moskalenko, N.G., Team, C. 2003. A physiognomic-based circumpolar Arctic Vegetation map. Eighth International Conference on Permafrost Extended Abstracts. Zurich, Switzerland, July 21 - 25. 177-178.
109. Gould, W.A., Edlund, S., Zoltai, S., Raynolds, M.K., Walker, D.A., Maier, H.A. 2002. Canadian Arctic vegetation mapping. International Journal of Remote Sensing. 23(21):4597-4609. PDF - Abstract. doi: 10.1080/01431160110113962.
110. Jia, G.J., Epstein, H.E., Walker, D.A. 2002. Spatial characteristics of AVHRR-NDVI along latitudinal transects in northern Alaska. Journal of Vegetation Science. 13:(3):315-326. PDF - JSTOR
111. Litaor, M.I., Seastedt, T.R., Walker, D.A. 2002. Spatial analysis of selected soil attributes across an alpine topographic/snow gradient. Landscape Ecology. 17:71-85. PDF
112. McGuire, A.D., Wirth, C., Apps, M., Beringer, J., Clein, J., Epstein, H., Kicklighter, D.W., Blatti, J., Chapin III, F.S., de Groot, B., Efremov, D., Eugster, W., Fukuda, M., Gower, T., Hinzman, L., Huntley, B., Jia, G.J., Kasischke, E., Melillo, J., Romanovsky, V., Shvidenko, A., Vaganov, E., Walker, D. 2002. Environmental variation, vegetation distribution, carbon dynamics and water/energy exchange at high latitudes. Journal of Vegetation Science. 13:(3):301-314. PDF - BioOne online article
113. Schickhoff, U., Walker, M.D., Walker, D.A. 2002. Riparian willow communities on the Arctic Slope of Alaska and their environmental relationships: A classification and ordination analysis. Phytocoenologia. 32:145-204. PDF - Abstract. doi: 10.1127/0340-269X/2002/0032-0145.
114. Walker, D.A., Gould, W.A., Maier, H.A., Raynolds, M.K. 2002. The Circumpolar Arctic Vegetation Map: AVHRR-derived base maps, environmental controls, and integrated mapping procedures. International Journal of Remote Sensing. 23(21):4551-4570. PDF - Abstract. doi: 10.1080/01431160110113854.
115. Pomeroy, J.W., Hoeller, P., Marsh, P., Walker, D.A., Williams, M.W. 2001. Snow vegetation interactions: Issues for a new initiative. in Soil, Vegetation, Atmosphere Transfer Schemes and Large Scale Hydrological Models (IAHS Publ. No. 270). pp. 299-306.
116. Walker, D.A., Bockheim, J.G., Chapin, F.S., III, Eugster, W., Nelson, F.E., Ping, C.L. 2001. Calcium-rich tundra, wildlife, and ''the Mammoth Steppe''. Quaternary Science Reviews. 20:149-163. PDF. doi: 10.1016/S0277-3791(00)00126-8.
117. Chapin, F.S., III, Eugster, W., McFadden, J.P., Lynch, A.H., Walker, D.A. 2000. Summer differences among arctic ecosystems in regional climate forcing. Journal of Climate. 13(12):2002-2010. PDF. doi: 10.1175/1520-0442(2000)013<2002:SDAAEI>2.0.CO;2.
118. Walker, D.A. 2000. Hierarchical subdivision of arctic tundra based on vegetation response to climate, parent material, and topography. Global Change Biology. 6(S1):19-34. PDF - Wiley online library. doi: 10.1046/j.1365-2486.2000.06010.x.
119. Muller, S.V., Racoviteanu, A.E., Walker, D.A. 1999. Landsat MSS-derived land-cover map of northern Alaska: extrapolation methods and a comparison with photo-interpreted and AVHRR-derived maps. International Journal of Remote Sensing. 20:2921-2946. PDF. doi: 10.1080/014311699211543.
120. Walker, D.A. 1999. An integrated vegetation mapping approach for northern Alaska (1:4 M scale). International Journal of Remote Sensing. 20(15-16):2895-2920. PDF. doi: 10.1080/014311699211534.
121. Walker, M.D., Walker, D.A., Welker, J.M., Arft, A.M., Bardsley, T., Brooks, P.D., Fahnestock, J.T., Jones, M.H., Losleben, M., Parsons, A.N., Seastedt, T.R., Turner, P.L. 1999. Long-term experimental manipulation of winter snow regime and summer temperature in arctic and alpine tundra. Hydrological Processes. 13:2315-2330. PDF - Abstract. doi: 10.1002/(SICI)1099-1085(199910)13:14/15<2315::AID-HYP888>3.0.CO;2-A.
122. Bockheim, J.G., Walker, D.A., Everett, L.R., Nelson, F.E. and Shiklomanov, N.I. 1998. Soils and cryoturbation in moist nonacidic and acidic tundra in the Kuparuk river basin, arctic Alaska, USA. Arctic and Alpine Research. 30:(2):166-174. PDF - JSTOR
123. Fahnestock, J.T., Jones, M.H., Brooks, P.D., Walker, D.A., Welker, J.M. 1998. Winter and early spring CO2 efflux from tundra communities of northern Alaska. Journal of Geophysical Research. 103(D22):29,023-29,027. PDF. doi: 10.1029/98JD00805.
124. Hobbie, J.E., Kwiatkowski, B.L., Rastetter, E.B., Walker, D.A., McKane, R.B. 1998. Carbon cycling in the Kuparuk basin: plant production, carbon storage, and sensitivity to future changes. Journal of Geophysical Research. 103:(D22):29065-29073. PDF - Abstract
125. Jones, M.H., Fahnestock, J.T., Walker, D.A., Walker, M.D., Welker, J.M. 1998. Carbon dioxide fluxes in moist and dry arctic tundra during the snow-free season: responses to increases in summer temperature and winter snow accumulation. Arctic and Alpine Research. 30:(4):373-380. PDF - JSTOR
126. Muller, S.V., Walker, D.A., Nelson, F.E., Auerbach, N., Bockheim, J., Guyer, S. and Sherba, D. 1998. Accuracy assessment of a land-cover map of the Kuparuk River basin, Alaska: considerations for remote regions. Photogrammetric Engineering & Remote Sensing. 64:(6):619-628. PDF - Abstract
127. Nelson, F.E., Hinkel, K.M., Shiklomanov, N.I., Mueller, G.R., Miller, L.L., Walker, D.A. 1998. Active-layer thickness in north central Alaska: Systematic sampling, scale, and spatial autocorrelation. Journal of Geophysical Research. 103:(D22):28963-28973. PDF - Abstract
128. Ping, C.-L., Bockheim, J.G., Kimble, J.M., Michaelson, G.J., Walker, D.A. 1998. Characteristics of cryogenic soils along a latitudinal transect in Arctic Alaska. Journal of Geophysical Research. 103:(D22):28917-28928. PDF - Abstract
129. Reeburgh, W.S., King, J.Y., Regli, S.K., Kling, G.W., Auerbach, N.A., Walker, D.A. 1998. A CH4 emission estimate for the Kuparuk River basin, Alaska. Journal of Geophysical Research. 103(D22):29,005-29,013. PDF - Abstract. doi: 10.1029/98JD00993.
130. Stow, D., Hope, A., Boynton, W., Phinn, S., Walker, D., Auerbach, N. 1998. Satellite-derived vegetation index and cover type maps for estimating carbon dioxide flux for Arctic tundra regions. Geomorphology. 21:313-327. PDF - Abstract. doi: 10.1016/S0169-555X(97)00071-8.
131. Walker, D.A., Auerbach, N.A., Bockheim, J.G., Chapin, F.S., III, Eugster, W., King, J.Y., McFadden, J.P., Michaelson, G.J., Nelson, F.E., Oechel, W.C., Ping, C.L., Reeburg, W.S., Regli, S., Shiklomanov, N.I., Vourlitis, G.L. 1998. Energy and trace-gas fluxes across a soil pH boundary in the Arctic. Nature. 394:469-472. PDF. doi: 10.1038/28839.
132. Auerbach, N.A., Walker, M.D., Walker, D.A. 1997. Effects of roadside disturbance on substrate and vegetation properties in arctic tundra. Ecological Applications. 7(1):218-235. PDF - JSTOR. doi: /10.1890/1051-0761(1997)007[0218:EORDOS]2.0.CO;2.
133. Nelson, F.E., Shiklomanov, N.I., Mueller, G.R., Hinkel, K.M., Walker, D.A. and Bockheim, J.G. 1997. Estimating active-layer thickness over a large region: Kuparuk River Basin, Alaska, USA. Arctic, Antarctic, and Alpine Research. 29:(4):367-378. PDF - JSTOR
134. Walker, M.D., Everett, K.R., Walker, D.A., Birkland, P.W. 1996. Soil development as an indicator of relative pingo age, Northern Alaska, USA. Arctic and Alpine Research. 28:(3):352-362. PDF - JSTOR
135. Brooks, P.D., Williams, M.K., Walker, D.A., Schmidt, S.K. 1995. The Niwot Ridge snowfence experiment: biogeochemical responses to changes in the seasonal snowpack. International Association of Hydrological Sciences. 228:293-302. PDF
136. Shippert, M.M., Walker, D.A., Auerbach, N.A., Lewis, B.E. 1995. Biomass and leaf-area index maps derived from SPOT images for Toolik Lake and Imnavait Creek areas, Alaska. Polar Record. 31(177):147-154. PDF - Abstract. doi: 10.1017/S0032247400013644.
137. Walker, D.A. 1995. Toward a new circumpolar arctic vegetation map: St. Petersburg workshop. Arctic and Alpine Research. 31:169-178.
138. Walker, D.A., Auerbach, N.A., Shippert, M.M. 1995. NDVI, biomass, and landscape evolution of glaciated terrain in northern Alaska. Polar Record. 31(177):169-178. PDF - Abstract. doi: 10.1017/S003224740001367X.
139. Walker, D.A., Bay, C., Daniels, F.J.A., Einarsson, E., Elvebakk, A., Johansen, B.E., Kapitsa, A., Kholod, S.S., Murray, D.F., Talbot, S.S., Yurtsev, B.A., Zoltai, S.C. 1995. Toward a new arctic vegetation map: a review of existing maps. Journal of Vegetation Science. 6(3):427-436. PDF - Abstract. doi: 10.2307/3236242.
140. Weller, G., Chapin, F.S., III, Everett, K.R., Hobbie, J.E., Kane, D.L., Oechel, W.C., Ping, C.L., Reeburgh, W.S., Walker, D.A., Walsh, J. 1995. The Arctic Flux Study: a regional view of trace gas release. Journal of Biogeography. 22:(2/3):365-374. PDF - JSTOR
141. Zhurbenko, M., Santesson, R., Walker, D.A., Auerbach, N.A., Lewis, B. 1995. New and interesting lichenicolous fungi and lichens from Alaska. Evansia. 12:92-97.
142. Jones, H.G., Pomeroy, J.W., Walker, D.A., Wharton, R.A. 1994. Snow ecology: a report on a new initiative. Arctic and Alpine Research. 26:(2):195-196. PDF - Permanent link
143. Jones, H.G., Pomeroy, J.W., Walker, D.A., Wharton, R.A. 1994. Snow Ecology: A Report on a New Initiative. Bulletin of the Ecological Society of America. 75:(1):29-31. PDF - Permanent link
144. Walker, M.D., Walker, D.A., Auerbach, N.A. 1994. Plant communities of a tussock tundra landscape in the Brooks Range Foothills, Alaska. Journal of Vegetation Science. 5:(6):843-866. PDF - JSTOR
145. Walker, D.A., Halfpenny, J.C., Walker, M.D., Wessman, C. 1993. Long-term studies of snow-vegetation interactions. BioScience. 43:(5):287-301. PDF - JSTOR
146. Walker, D.A., Krantz, W.B., Lewis, B.L., Price, E.T., Tabler, R.T. 1993. Hierarchic studies of snow-ecosystem interactions: a 100-year snowpack-alteration experiment. Proceedings of the 50th Eastern Snow Conference 61st Western Snow Conference. Quebec City, Quebec, June 8-10. 407-414. PDF - Online Proceedings
147. Walker, D.A., Everett, K.R. 1991. Loess ecosystems of northern Alaska: regional gradient and toposequence at Prudhoe Bay. Ecological Monographs. 61:(4):437-464. PDF - Permanent link
148. Walker, D.A., Walker, M.D. 1991. History and pattern of disturbance in Alaskan Arctic terrestrial ecosystems: A hierarchical approach to analysing landscape change. Journal of Applied Ecology. 28:(1):244-276. PDF - JSTOR
149. Walker, M.D., Walker, D.A., Everett, K.R. and Short, S.K. 1991. Steppe vegetation on south-facing slopes of pingos, central Arctic Coastal Plain, Alaska, USA. Arctic and Alpine Research. 23:170-188. PDF - JSTOR
150. Slaughter, C.W., Racine, C.H., Walker, D.A., Johnson, L.A., Abele, G. 1990. Use of off-road vehicles and mitigation of effects in Alaska permafrost environments: a review. Environmental Management. 14:63-72. PDF. doi: 10.1007/BF02394020.
151. Evans, B.M., Walker, D.A., Benson, C.S., Nordstrand, E.A., Petersen, G.W. 1989. Spatial interrelationships between terrain, snow distribution and vegetation patterns at an arctic foothills site in Alaska. Holarctic Ecology. 12:270-278. PDF - JSTOR
152. Walker, D.A., Binnian, E., Evans, B.M., Lederer, N.D., Nordstrand, E., Webber, P.J. 1989. Terrain, vegetation and landscape evolution of the R4D research site, Brooks Range Foothills, Alaska. Holarctic Ecology. 12:(3):238-261. PDF - JSTOR
153. Walker, D.A., Lederer, N.D., Walker, M.D., Binnian, E., Everett, K.R., Nordstrand, E., Webber, P.J. 1989. Impacts of petroleum development in the Arctic: Response. Science. 245:764-765. PDF - JSTOR
154. Walker, D.A. 1987. Height and growth-ring response of Salix lanata ssp. richardsonii along the coastal temperature gradient of northern Alaska. Canadian Journal of Botany. 65(5):988-993. PDF - Abstract. doi: archpress.com/doi/abs/10.1139/b87-136.
155. Walker, D.A., Everett, K.R. 1987. Road dust and its environmental impact on Alaskan taiga and tundra. Arctic and Alpine Research. 19:(4):479-489. PDF - JSTOR
156. Walker, D.A., Webber, P.J., Binnian, E.F., Everett, K.R., Lederer, N.D., Nordstrand, E.A., Walker, M.D. 1987. Cumulative Impacts of Oil Fields on Northern Alaskan Landscapes. Science. 238:(4828):757-761. PDF - Permanent link
157. Walker, D.A., Webber, P.J., Walker, M.D., Lederer, N.D., Meehan, R.H., Nordstrand, E.A. 1986. Use of geobotanical maps and automated mapping techniques to examine cumulative impacts in the Prudhoe Bay Oilfield, Alaska. Environmental Conservation. 13(2):149-160. PDF - Abstract. doi: 10.1017/S0376892900036754.
158. Walker, D.A., Walker, M.D., Everett, K.R., Webber, P.J. 1985. Pingos of the Prudhoe Bay region. Arctic and Alpine Research. 17:(3):321-336. PDF - JSTOR
159. Klinger, L.F., Walker, D.A., Webber, P.J. 1983. The effects of gravel roads on Alaskan Arctic Coastal Plain tundra. Fourth International Conference on Permafrost. Fairbanks, AK, 17-22 July. 628-633. PDF
160. Walker, D.A. 1983. A hierarchical tundra vegetation classification especially designed for mapping in northern Alaska. Fourth International Conference on Permafrost. Fairbanks, AK, 17-22 July. 1332-1337. PDF - PDF of all presentations
161. Walker, D.A., Short, S.K., Andrews, J.T., Webber, P.J. 1981. Late Holocene pollen and present-day vegetation, Prudhoe Bay and Atigun River, Alaskan North Slope. Arctic and Alpine Research. 13:(2):153-172. PDF - JSTOR
162. Walker, D.A., Webber, P.J. 1979. Relationship of soil acidity and air temperature to the wind and vegetation at Prudhoe Bay, Alaska. Arctic. 32:(3):224-236. PDF - Abstract
163. Everett, K.R., Webber, P.J., Walker, D.A., Parkinson, R.J., Brown, J. 1978. A geoecological mapping scheme for Alaskan coastal tundra. Proceedings of the Third International Conference on Permafrost. Edmonton, Alberta, Canada, 10-13 July. 359-365. PDF
164. Walker, D.A., Webber, P.J., Everett, K.R., Brown, J. 1978. Effects of crude and diesel spills on plant communities at Prudhoe Bay, Alaska, and the derivation of oil spill sensitivity maps. Arctic. 31:(3):242-259. PDF - Abstract

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Published Abstracts in Proceedings Volumes, Refereed Government Reports and Maps (*invited)

1. Frost, G.V., Epstein, H.E., Walker, D.A. 2012. Widespread expansion of boreal shrublands in the Siberian Low Arctic since the 1960s. AGU Fall Meeting. San Francisco, CA December 3-7. PDF - CC31A-0965, Wednesday Dec. 5, session GC31A
2. Bieniek, P.A., Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Pinzon, J.C., Comton, J.T., Thoman, R.L., Tran, H., Molders, N., Ermold, W., Zhang, J., Steele, M. 2012. Alaska Coastal Tundra Vegetation's Links to Climate. AGU Fall Meeting, San Francisco, CA December 3-7. PDF
3. Talbot, S.S., Baldwin, K.A., Jorgensen, M.T., MacKenzie, W., Meades, W.J., Meidinger, D., Robitaille, A., Saucier, J.P., Selkowitz, D., Walker, D.A. 2011. Progress toward a circumboreal vegetation map (CBVM) emphasizing boreal North America. European Vegetation Survey 20th Workshop. Rome, Italy April 6-9.
4. Walker, D.A., Kuss, H.P., Kopecky, M., Frost, G.V., Daniëls, F.J.A., Kade, A.N., Vonlanthen, C.M., Raynolds, M.K., Epstein, H.E. 2011. The North American and Eurasia Arctic transects: Using phytosociology and remote sensing to detect vegetation pattern and change. European Vegetation Survey 20th Workshop. Rome, Italy April 6-9. PDF
5. Bieniek, P.A., Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C. 2011. Impacts of Changing Seasonality on Arctic Systems and an Arctic in Rapid Transition II. AGU Fall Meeting. San Francisco, CA, December 5-9. PDF - GC32A-04, Wednesday, Dec. 7, session GC32A
6. Bhatt, U.S., Walker, D.A., Raynlds, M.K, Bieniek, P., Comiso, J.C., Pinzon, J.E., and Tucker, C.J. 2011. The role of seasonality and large-scale climate drivers in recent Pan-Arctic tundra vegetation variability and change. AGU Fall Meeting. San Francisco, CA, December 5-9. PDF - GC51F-1075, Friday, Dec. 9, session GC51F
7. Frost, G.V., Epstein, H.E., Walker, D.A., Matyshak, G., Ermokhina, K. 2011. Tall shrub expansion facilitated by patterned ground in the northwest Siberian Low Arctic. AGU Fall Meeting. San Francisco, CA, December 5-9. PDF - GC51F-1058, Friday, Dec. 9, session GC51F
8. Walker, D.A., Raynolds, M.K. 2011. An International Arctic Vegetation Database: A foundation for panarctic biodiversity studies. CAFF Strategy Series Report nr. 5. 29 pp. PDF
9. Yu, Q., Epstein, H., Walker, D.A., and Forbes, B.C. 2011. Modeling dynamics of circum-arctic tundra plant communities in response to climate warming and grazing pressure. AGU Fall Meeting. San Francisco, cA, December 5-9. PDF - GC41C-0831, Friday, Dec. 9, session GC51F
10. Walker, D.A., Bhatt, U.S., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Frost, G.V., Leibman, M.O., Forbes, B.C., Comiso, J.C., Tucker, C.J., Pinzon, J. 2011. Satellite and land-based observations of environment, vegetation and NDVI along two Arctic Transects: Partial results from the IPY Greening of the Arctic Project. AGU Fall Meeting. San Francisco, CA, December 5-9. PDF - GC51F-1072, Friday, Dec. 9, session GC51F
11. Walker, D.A., Bhatt, U.S., Callaghan, T.V., Comiso, J.C., Epstein, H.E., Forbes, B.C., Gill, M., Gould, W.A., Henry, G.H.R., Jia, G.J., Kokelj, S.V., Lantz, T.C., Oberbauer, S.F., Pinzon, J.E., Raynolds, M.K., Shaver, G.R., Tucker, C.J., Tweedie, C.E., Webber, P.J. 2011. Vegetation. in Arctic Report Card 2011. PDF - Website
12. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Comiso, J.C., Pinzon, J.E., Tucker, C.J., Polyakov, I.V., Liu, Y., Gens, R., Tweedie, C.E., Webber, P.J., Steele, M., Jia, G.J. 2010. Understanding drivers of recent Arctic tundra vegetation changes. AGU Fall Meeting. San Francisco, CA, 13-17 December. PDF
13. Bieniek, P.A., Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Gens, R., Pinzon, J.E., Tucker, C.J., Steele, M., Ozimek, C. 2010. Alaska tundra vegetation trends and their links to the large-scale climate. AGU Fall Meeting. San Francisco, CA, 13-17 December. PDF
14. Epstein, H.E., Walker, D.A., Raynolds, M.K., Kelley, A.M., Jia, G.J., Ping, C.L. 2010. Vegetation biomass, leaf area index, and NDVI patterns and relationships along two latitudinal transects in arctic tundra. IPY Oslo Science Conference. Oslo, Norway 8-12 Jun.
15. Frost, G.V., Epstein, H.E., Walker, D.A., Yu, Q., Raynolds, M.K. 2010. Spatio-temporal trends in vegetation structure and NDVI in Low Arctic northwest Siberia: evidence from the satellite record and ground observations. AGU Fall Meeting. San Francisco, CA, 13-17 December. PDF - GC54A-03
16. Raynolds, M.K., Walker, D.A., Verbyla, D., Munger, C.A. 2010. Changes in tundra vegetation over 25 years as measured by Landsat NDVI in the Upper Kuparuk River Basin, North Slope Alaska, 1985-2009. AGU Fall Meeting. San Francisco, CA, 13-17 December. PDF - GC43B-0984
17. Talbot, S.S., Walker, D.A. 2010. Circumboreal Vegetation Mapping (CBVM) Project: Introduction and objectives. Circumboreal Vegetation Mapping (CBVM) Workshop. Helsinki, Finland, November 3-6, 2008. 1-3.
18. Walker, D.A. 2010. Greening of the Arctic: Spatial and temporal (1982-2009) variation of circumpolar tundra NDVI and aboveground biomass. AGU Fall Meeting. San Francisco, CA, 13-17 December. PDF - GC53B-01
19. Walker, D.A., Epstein, H.E., Bhatt, U.S., Leibman, M.O., Forbes, B., Romanovsky, V.E., Raynolds, M.K., Jia, G.J., Frost, G.V., Khomutov, A.V., Moskalenko, N.G., Orekhov, P., Matyshak, G., Webber, P.J., Tweedie, C.E., Gould, W.A., Mercado, J., Munger, C.A., Maier, H.A., Comiso, J., Pinzon, J.E., Tucker, C.J., Ukraintseva, N.G., Drozdov, D.S., Gubarkov, A.A., Kaarlejärvi, E., Khitun, O., Kuss, P., Yu, Q. 2010. Greening of the Arctic: A planet-to-plant analysis of Arctic vegetation change. IPY Oslo Science Conference. Oslo, Norway 8-12 June. PDF
20. Yu, Q., Epstein, H.E., Walker, D.A., Frost, G.V. 2010. Modeling dynamics of tundra plant communities on the Yamal Peninsula. AGU Fall Meeting. San Francisco, CA, 13-17 December. PDF - GC54A-04
21. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Steele, M., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2009. Seasonality of the air-sea-ice-land environment of Arctic tundra in Northern Eurasia and North America. AGU Fall Meeting. San Francisco, CA, December 14-18. 90:GC31A-0701. PDF
22. Epstein, H.E., Walker, D.A., Raynolds, M.K., Kelley, A.M., Jia, G.J., Ping, C.L., Michaelson, G.J., Liebman, M.O., Kaarlejärvi, E., Khumotov, A.V., Kuss, H.P., Moskalenko, N.G., Orekhov, P., Matyshak, G., Forbes, B.C., Yu, Q. 2009. Vegetation biomass, leaf area index, and NDVI patterns and relationships along two latitudinal transects in arctic tundra. AGU Fall Meeting. San Francisco, CA, December 14-18. 90:GC31A-0697. PDF
23. Frost, G.V., Epstein, H.E., Walker, D.A. 2009. Spatio-temporal trends in tree and tall shrub cover in the Eurasian Low Arctic: evidence from 1960s and contemporary satellite imagery and ground observations. AGU Fall Meeting. San Francisco, CA, December 14-18. 90:GC31A-0698. PDF
24. Walker, D.A., Bhatt, U.S., Epstein, H.E., Raynolds, M.K., Frost, G.V., Liebman, M.O., Khumotov, A.V., Jia, G.J., Forbes, B.C., Comiso, J.C., Pinzon, J.E., Tucker, C.J., Webber, P.J., Tweedie, C.E. 2009. Circumpolar Arctic greening: Relationships to summer sea-ice concentrations, land temperatures and disturbance regimes. AGU Fall Meeting. San Francisco, CA, December 14-18. 90:GC43B-08. PDF
25. Walker, D.A., Walker, M.D., Auerbach, N.A., Maier, H.A., Neufeld, G.P. 2009. Toolik Grid Plots: Baseline canopy height and species composition in 1990. Mapping and Monitoring of Nordic Vegetation and Landscapes. Hveragerdi, Iceland 16-18 September. PDF
26. Yu, Q., Epstein, H.E., Walker, D.A. 2009. Simulating soil organic nitrogen and grazing effects on arctic tundra vegetation dynamics on the Yamal Peninsula, Russia. AGU Fall Meeting. San Francisco, CA, December 14-18. 90:GC31A-0693.
27. Walker, D.A., Bhatt, U.S., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Jia, G.J., Pinzon, J.E., Tucker, C.J. 2009. Vegetation. in Arctic Report Card 2008. PDF - Website
28. Bhatt, U.S., Walker, D.A., Raynolds, M., Comiso, J. 2008. Examining relationships between sea ice and Arctic vegetation on the Pan-Arctic, regional and site scales. European Geosciences Union General Assembly. Vienna, Austria, 13 -18 April. 10:EGU2008-A-11271. - Abstract
29. Epstein, H.E., Walker, D.A., Kuss, P., Karlejaärvi, E., Matyshak, G. 2008. Ecosystem Properties along a Latitudinal Gradient of the Yamal Region, Russia. European Geosciences Union General Assembly. Vienna, Austria, 13 - 18 April. 10:EGU2008-A-04406. PDF - Abstract
30. Jia, G.J., Epstein, H.E., Walker, D.A., Wang, H. 2008. Decadal changes of phenological patterns over arctic tundra biome. AGU Fall Meeting. San Francisco, CA, Dec. 15-19. 89:C21C-0559. PDF
31. *Walker, D.A., Bhatt, U.S., Epstein, H.E. 2008. Greening of the Arctic: an IPY Initiative. AGU Fall Meeting. San Francisco, CA, December 12-15. 89:1. PDF - U23F-05 INVITED
32. Walker, D.A., Bhatt, U.S., Romanovsky, V.E., Kofinas, G.P., Raynolds, M.K., Epstein, H.E., Yu, Q., Forbes, B.C., Stammler, F., Karlejäarvi, E., Leibman, M., Moskalenko, N., Gubarkov, A., Khomutov, A., Kumpula, T., Comiso, J.C., Kuss, J.P., Jia, G.J., Kaplan, J.O., Matyshak, G. 2008. Application of space-based technologies and models to address land-cover/land-use change problems on the Yamal Peninsula, Russia. European Geosciences Union General Assembly. Vienna, Austria, April 13-18. 10:EGU2008-A-05697. PDF - EGU2008-A-05697
33. Walker, D.A., Leibman, M.O., Forbes, B.C., Epstein, H.E. 2008. Cumulative effects of rapid climate and land-use changes on the Yamal Peninsula, Russia. AGU Fall Meeting. San Francisco, CA, December 15-19. 89:GC52A-07. PDF - GC52A-07
34. Walker, D.A., Barbour, E.M., Maier, H.A. 2008. A Web-based Arctic Geobotanical Atlas and a New Hierarchy of Maps of the Toolik Lake Region, Alaska. Ninth International Conference on Permafrost. Fairbanks, AK, June 29 - July 3. 2:1893-1898. PDF
35. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C. 2007. The relationship between sea ice variability and arctic tundra on the pan-Arctic, regional, and site scales. AGU Fall Meeting, San Francisco, CA, December 10-14, 2007.
36. Jia, G.J., Epstein, H.E., Walker, D.A. 2007. Trends of Vegetation Greenness in the Arctic from 1982-2005. AGU Fall Meeting, San Francisco, CA, December 10-14, 2007. PDF
37. Kuss, K. and Walker, D.A. 2007. Project for interlinked Flora Arctica and Arctic Vegetation databases. Proceedings of the Fourth International Conservation of Arctic Flora and Fauna (CAFF) Flora Group Workshop, Tórshavn, Faroe Islands, May 15-18, 2007. Akureyri, Iceland, . 63-65. PDF
38. van Bogaert, R., Walker, D.A., Jia, G.J., Grau, O., Hallinger, M., De Dapper, M., Jonasson, C. and Callaghan, T.V. 2007. Recent changes in vegetation. in Arctic Report Card 2007. PDF - Website
39. Walker, D.A. 2007. The Circumpolar Arctic Vegetation Map, the Alaska Arctic Tundra Vegetation Map, and the Arctic Geobotanical Atlas. Proceedings of the Fourth International CAFF Flora Group Workshop. 15:60-62. PDF - CAFF Website
40. Daanen, R.P., Misra, D., Epstein, H.E., Walker, D.A. 2006. Modeling hydrology-vegetation interactions in non-sorted-circle ecosystems. AGU Fall Meeting. San Francisco, CA, December 11 - 15. C44A-07. - C44A-07
41. Epstein, H.E., Kelley, A.M., Walker, D.A., Jia, G.J., Raynolds, M.K. 2006. Regional-scale vegetation dynamics in patterned-ground ecosystems of arctic tundra. AGU Fall Meeting. San Francisco, CA, December 11-15. 87:C51A-0396. - C51A-0396
42. Gould, W.A., González, G., Walker, D.A. 2006. Integrating research and education in a study of biocomplexity in arctic tundra ecosystems: costs, results, and benefits to the research agenda. AGU Fall Meeting. San Francisco, CA, December 11-15. C44A-08. - C44A-08
43. Jia, G.J., Epstein, H.E., Walker, D.A. 2006. Decadal changes of vegetation greenness in the Canadian Arctic. AGU Fall Meeting. San Francisco, CA, December 11-15. 87:C51A-0383. - C51A-0383
44. Kelley, A.M., Epstein, H.E., Walker, D.A., Ping, C. 2006. Soil nitrogen transformations associated with small patterned-ground features along the complete arctic bioclimatic gradient. AGU Fall Meeting. San Francisco, CA, December 11 - 15. C51A-0395. - C51A-0395
45. Kuss, P., Kade, A.N., Vonlanthen, C.M., Raynolds, M.K., Matveyeva, N.V., Daniels, F.J.A., Walker, D.A. 2006. Vegetation differentiation of arctic patterned-ground ecosystems. AGU Fall Meeting. San Francisco, CA, December 11-15. 87:C44A-05. - C44A-05
46. Michaelson, G.J., Ping, C.L., Epstein, H.E., Kimbel, J.M., Romanovsky, V.E., Tarnocai, C.T., Walker, D.A. 2006. Soil Properties and Patterned Ground Across the North American Arctic Transect. AGU Fall Meeting. San Francisco, CA, December 11-15. C51A-0397. - C51A-0397
47. Munger, C.A., Walker, D.A., Raynolds, M.K., Kade, A.N., Vonlanthen, C.M., Kuss, P., Daanen, R.P. 2006. The North American Arctic Transect: baseline vegetation and active layer maps for the IPY. AGU Fall Meeting. San Francisco, CA, December 11 - 15. C51A-0382. - C51A-0382
48. Raynolds, M.K., Walker, D.A., Kade, A.N., Vonlanthen, C.M., Vockeroth, S.G., Munger, C.A., Kuss, H.P. 2006. Aboveground Phytomass of Vegetation Communities Along an Arctic Climate Gradient. AGU Fall Meeting. San Francisco, CA, December 11-15. 87:C51A-0385. PDF - C51A-0385
49. Romanovsky, V.E., Marchenko, S.S., Daanen, R., Nikolsky, D., Sergeev, D.O., Walker, D.A. 2006. Soil climate and frost heave along the permafrost/ecological North American Arctic Transect. AGU Fall Meeting. San Francisco, CA, December 11 - 15. C44A-06. - C44A-06
50. Walker, D., Daanen, R., Epstein, H.E., Gould, W., Gonzalez, G., Kade, A., Kelley, A., Krantz, W., Kuss, J.P., Michaelson, G., Munger, C., Nickolsky, D., Peterson, R., Ping, C., Raynolds, M.K., Romanovsky, V., Tarnocai, C., Vonlanthen, C. 2006. Biocomplexity of Arctic Patterned Ground: A tale of cracking, heaving, and smothering. AGU Fall Meeting. San Francisco, CA, December 14. 87:C44A-04. PDF - C44A-04
51. Daanen, R.P., Peterson, R., Misra, D., Nicolsky, D., Epstein, H.E., Walker, D.A. 2006. Modeling self organization of non-sorted circles. European Geosciences Union General Assembly. Vienna, Austria April 2-7. PDF
52. Epstein, H.E., D.A. Walker, G.J. Jia, Kelley, A.M. 2005. Climate, plant biomass, NDVI, and LAI relationships along the full arctic bioclimate gradient. AGU Fall Meeting, San Francisco, CA, December 5-9. 86:B33E-1092. - B33E-1092
53. Jia, G.J., Epstein, H.E., Walker, D.A. 2005. Uneven response of arctic tundra to recent environmental changes. AGU Fall Meeting, San Francisco, CA, December 5-9. 86:B33E-1091. - B33E-1091
54. Kade, A., Walker, D.A., Romanovsky, V.E. 2005. The effect of vegetation, soil organic layer and snow on the modified N-factor in patterned-ground ecosystems. AGU Fall Meeting, San Francisco, CA, December 5-9. 86:C21C-1135. - C21C-1135
55. Kelley, A.M., Epstein, H.E., Walker, D.A. 2005. Soil nitrogen cycling associated with small patterned ground features along a high-latitude temperature gradient in northern Alaska. AGU Fall Meeting, San Francisco, CA, December 5-9. B51A-0193.
56. Nicolsky, D.J., Romanovsky, V.E., Tipenko, G.S., Walker, D.A. 2005. Modeling non-sorted circles along low Arctic climate gradient, Dalton Highway, Alaska. AGU Fall Meeting, San Francisco, CA, December 5-9. 86:C31A-1107. PDF - C31A-07
57. Ping, C.-L., Kimble, J.M., Michaelson, G.J., Tarnocai, C., Walker, D.A. 2005. Carbon stores and their distribution in different arctic ecosystems. 1st Climate and Cryosphere International Science Conference. Beijing, China April 11 - 15.
58. Ping, C.-L., Michaelson, G.J., Tarnocai, C., Walker, D.A. 2005. Cryogenic features of tundra soils along a bioclimate gradient in arctic Alaska and Canada. AGU Fall Meeting, San Francisco, CA, December 5-9. 86:C24A-05. - C24A-05
59. Raynolds, M.K., Walker, D.A., Kade, A.N., Munger, C.A. 2005. Small-scale patterned ground in the Arctic: Maps of vegetation and thaw depth on a north-south transect. AGU Fall Meeting, San Francisco, CA, December 5-9. 86:C24A. - C24A-06
60. Walker, D.A., Daanen, R.P., Epstein, H.E., Gonzalez, G., Gould, W.A., Kade, A.N., Kelley, A.M., Krantz, W.B., Michaelson, G.J., Munger, C.A., Nickolsky, D.J., Peterson, R.A., Ping, C.L., Raynolds, M.K., Romanovsky, V.E., Shur, Y.L., Tarnocai, C.T., Tipenko, G.S., Timling, I., Vonlanthen, C.M. 2005. The North American Arctic Transect: Patterned ground ecosystems across the full arctic bioclimate gradient. AGU Fall Meeting, San Francisco, CA, December 5-9. 86:C24A-03. - C24A-03
61. Afonina, O.M., Raynolds, M.K., Walker, D.A. 2005. On the moss flora of Mould Bay (Prince Patrick Island, Canadian Arctic Archipelago). Arctoa. 14:135-142. PDF
62. Hinzman, L.D., Bettez, N., Bolton, W.R., Chapin, F.S., III, Dyurgerov, M.B., Fastie, C.L., Griffith, B., Hollister, R.D., Hope, A., Huntington, H.P., Jensen, A.M., Jia, G.J., Jorgensen, T., Kane, D.L., Klein, D.R., Kofinas, G.P., Lynch, A.H., Lloyd, A.H., Nolan, M., Oechel, W.C., Osterkamp, T.E., Racine, C.H., Romanovsky, V.E., Stone, R.S., Stow, D.A., Sturm, M., Tweedie, C.E., Vourlitis, G.L., Walker, M.D., Walker, D.A., Webber, P.J., Welker, J.M., Yoshikawa, K. 2004. Evidence and Implications of Recent Climate Change in Northern Alaska and Other Arctic Regions. AGU Fall Meeting, San Francisco, CA, December 13-17. 85:GC51A-1052. - GC51A-1052
63. Nicolsky, D.J., Romanovsky, V.E., Tipenko, G.S., Walker, D.A. 2004. A coupled thermo-mechanical model of differential frost heave. AGU Fall Meeting, San Francisco, CA, December 13-17. 85:C13B-0282. - C13B-0282
64. Walker, D.A., Epstein, H.E., Kuss, P., Michaelson, G., Ping, C.L., Raynolds, M.K., Romanovsky, V.E., Tarnocai, C.T. 2004. Interactions of multiple factors for patterned-ground features across the Arctic bioclimate gradient. AGU Fall Meeting, San Francisco, CA, December 13-17. 85:F424. PDF - C12A-07
65. Gould, W.A., Gonzalez, G., Walker, D.A. 2003. Integrating research and education in a study of Arctic frost-boil ecosystems. AGU Fall Meeting, San Francisco, CA, December 8 - 12. 84:ED21B-1218. - ED21B-1218
66. Gould, W.A., Quijano, A., Gonzalez, G., Walker, D.A. 2003. Variation in frost-boil morphology and associated vegetation characteristics along a climatic gradient. AGU Fall Meeting, San Francisco, CA, December 8-12. 84:B31C-0311. - B31C-0311
67. Walker, D.A., Raynolds, M.K., Maier, H.A. 2003. The Circumpolar Arctic Vegetation Map: A tool for analysis of change in permafrost regions. AGU Fall Meeting, San Francisco, CA, December 8 - 12. 84:C11E-05. - C11E-05
68. Michaelson, G.J., Ping, C.L., Walker, D.A. 2002. Biogeochemistry of Soils Associated with Cryptogamic Crusts on Frost Boils. AGU Fall Meeting, San Francisco, CA, December 6-10. 83:F260.
69. Ping, C.-L., Michaelson, G.J., Kimble, J., Shur, Y.L., Walker, D.A. 2002. Morphogenesis of soils associated with frost boils. AGU Fall Meeting, San Francisco, CA, December 6-10. 83:F259. PDF
70. Walker, D.A., Jia, G.J., Epstein, H.E., Shiklomanov, N.I., Nelson, F.E., Hinzman, L.D., Romanovsky, V.E. 2002. Vegetation-soil-active layer relationships along a low-arctic bioclimate gradient, Alaska. AGU Fall Meeting, San Francisco, CA, December 6-10. 83:B72D-02. - B72D-02
71. Walker, D.A., Burian, J.C., Epstein, H.E., Gould, W.A., Jia, G.J., Maier, H.A., Raynolds, M.K. 2001. Controls on Arctic NDVI Patterns: a Zonal Analysis. AGU Fall Meeting. San Francisco, CA, December 10-14. 82:B22C-0176. - B22C-0176
72. Copass, C., Beringer, J., McGuire, A.D., Chapin, F.S., III, Walker, D.A. 2000. Characterization of Vegetation Biomass and Structure Along a Gradient from Tundra to Forest at Treeline in Council, Alaska. AGU Fall Meeting, San Francisco, CA, December 15-19. 81:B72B-09. PDF - B72B-09
73. Gould, W.A., Raynolds, M.K., Walker, D.A. 2000. Vegetation Characteristics Derived from an Integrated Vegetation Complex Map for the Canadian Arctic. AGU Fall Meeting, San Francisco, CA, December 15-19. 81:B72B-13. - B72B-13
74. Ping, C.L., Michaelson, G.J., Dai, X., Everett, L., Kimble, J.M., Walker, D.A. 2000. Characteristics of Soils Associated With ATLAS Sites in Western Alaska. AGU Fall Meeting, San Francisco, CA, December 15-19. 81:B72B-15. - B72B-15
75. Riedel, S.M., Epstein, H.E., Walker, D.A. 2000. Biotic controls on spectral reflectance indices of tundra vegetation. AGU Fall Meeting, San Francisco, CA, December 15-19. 81:B71D-11. - B71D-11
76. Walker, D.A., Epstein, H.E., Jia, J.G., Edwards, E.J., Moody, A. 2000. Climate, Vegetation, Soil, and Spectral Reflectance Patterns Across Zonal Vegetation Boundaries in Arctic Alaska. AGU Fall meeting, San Francisco, CA, December 15-19. 81:F223. - B71F-08
77. Markon, C.J., Walker, D.A. 1999. Proceedings of the Third International Circumpolar Arctic Vegetation Mapping Workshop. USGS Open File Report No. 99-551. . 79. PDF
78. Walker, D.A. 1998. Welcome, History, and Goals of the 3rd International Circumpolar Arctic Vegetation Mapping Workshop. 3rd International Circumpolar Arctic Vegetation Mapping Workshop. Anchorage, AK June 3-7.
79. Walker, D.A. 1998. An Integrated Vegetation Map for Northern Alaska: A Prototype for Circumpolar Arctic Vegetation Mapping. 3rd International Circumpolar Arctic Vegetation Mapping Workshop. Anchorage, AK June 3-7.
80. Walker, D.A. 1998. An integrated vegetation mapping approach for the Circumpolar Arctic Vegetation Map. 3rd International Circumpolar Arctic Vegetation Mapping Workshop. Anchorage, AK June 3-7.
81. Eugster, W., J. P. McFadden, F. S. Chapin III, Walker, D.A. 1997. Importance of Landscape Age and Plant Community Composition for the Surface Energy Budget and Carbon Fluxes in Alaskan Arctic Tundra. Annales Geophysicae. 15:(Supplement II):C356.
82. Auerbach, N.A., Walker, D.A. 1996. An electronic hierarchic geobotanical atlas for arctic system science. Second Circumpolar Arctic Vegetation Mapping Workshop and The CAVM-North American Workshop. Arendal, Norway, and Anchorage, AK, 19-24 May 1996/14-16 January 1997. Occasional Paper No. 52:26-27. PDF - Purchase proceedings
83. Murray, D.F., Walker, D.A. 1996. ''Tundra'' and the ''Arctic''. Second Circumpolar Arctic Vegetation Mapping Workshop and The CAVM-North American Workshop. Arendal, Norway and Anchorage, AK, 19-24 May 1996/14-16 January 1997. 52:14-15. PDF - Purchase proceedings
84. Walker, D.A. 1996. Method for making an integrated vegetation map of northern Alaska (1:4,000,000 scale). Second Circumpolar Arctic Vegetation Mapping Workshop and The CAVM-North American Workshop. Arendal, Norway and Anchorage, AK, 19-24 May 1996/14-16 January 1997. 52:54-61. PDF - Purchase proceedings
85. Walker, D.A. 1996. Progress since the first CAVM workshop and goals of the second. Second Circumpolar Arctic Vegetation Mapping Workshop and The CAVM-North American Workshop. Arendal, Norway, and Anchorage, AK, 19-24 May 1996/14-16 January 1997. Occasional Paper No. 52:1-6. PDF - Purchase proceedings
86. *Walker, D.A., N.A. Auerbach, J.G. Bockheim, C.-L. Ping, G. Michaelson, F.E. Nelson, N.I. Shiklomanov, G.R. Mueller, F.S. Chapin III, W. Eugster, J. McFadden, K.R. Everett, L. Everett, K. Hinkel, L. Miller, W.S. Reeburgh 1996. Studies of process, pattern and scale in arctic ecosystems. AGU Fall Meeting, San Francisco, CA, December 13-16.
87. Walker, D.A., Lillie, A.C. 1996. Proceedings of the Second Circumpolar Arctic Vegetation Mapping Workshop and the CAVM-North American Workshop. Second Circumpolar Arctic Vegetation Mapping Workshop and The CAVM-North American Workshop. 52. PDF
88. Walker, D.A., N. Auerbach, M. Walker, J. Brown, K. Everett, L. Hinzman, F. Nelson, Moskolenko, N. 1995. Monitoring change in arctic terrestrial ecosystems at multiple scales. Workshop to define research priorities for Russian Arctic land-shelf systems. Columbus, OH, January 10-12. 118-120.
89. Walker, D.A., Walker, M.D., Welker, J.M., Parsons, A.N., Seastedt, T.R., Lewis, B.E., Brooks, P.D. 1995. Long-term snow-fence experiments to examine effects of altered winter precipitation regimes in arctic and alpine tundra. Bulletin of the Ecological Society of America. 76:(2):276.
90. Walker, M.D., Walker, D.A., Everett, K.R. 1995. Pingos as models of arctic landscape development. Bulletin of the Ecological Society of America. 76:(2):276.
91. Welker, J.M., Parsons, A.N., Walker, M.D., Walker, D.A., Seastedt, T.R., Robinson, C.H., Wookey, P.A. 1995. Comparative responses of Dryas octopetala to simulated changes in climate from alpine, low- and high- arctic ITEX sites. Bulletin of the Ecological Society of America. 76:(2):281.
92. Brooks, P., Williams, M.W., Walker, D.A., Schmidt, S.K. 1994. Nitrous oxide and carbon dioxide flux from snow covered soils: responses to changes in precipitation and temperature. AGU Fall Meeting, San Francisco, December 5-9.
93. Everett, K.R., Brown, J., Walker, D.A., Webber, P.J. 1994. Long-term natural recovery of development related disturbances in northern Alaska. The industrial development of the North and problem of recultivation. Syktyvkar, USSR, July 8-14.
94. Shippert, M.M., D.A. Walker, N.A. Auerbach, B.E. Lewis 1994. Regional biomass and leaf-area estimates derived from satellite imagery as inputs to spatial trace-gas models for arctic tundra. Annual Ecological Society of America (ESA) Meeting: science and public policy. 75:(2):211. - Abstract
95. Walker, D.A. 1994. Background and goals of the Circumpolar Arctic Vegetation Mapping Workshop. Circumpolar Arctic Vegetation Mapping Workshop. Komarov Botanical Institute, St. Petersburg, Russia March 21-25.
96. Walker, D.A. 1994. A hierarchic geographic information system for northern Alaska: insights toward a circumpolar arctic vegetation map. Circumpolar Arctic Vegetation Mapping Workshop. Komarov Botanical Institute, St. Petersburg, Russia March 21-25. PDF
97. *Walker, D.A., M. D. Walker, L.R. Lestak, K.R. Everett, Webber, P.J. 1994. Application of geographic information systems to the problem of cumulative impacts in the Prudhoe Bay Oil Field, Alaska. The industrial development of the North and problem of recultivation. Syktyvkar, USSR, July 8-14, 1991. 151. PDF - Full proceedings
98. Lewis, B.E., E.T. Price, Walker, D.A. 1993. A snow fence experiment to examine long-term ecosystem response to altered snow regimes in the Colorado alpine. Bulletin of the Ecological Society of America. 74:(2):328-329.
99. Walker, D.A., Auerbach, N.A., Everett, K.R., Shippert, M.M., Walker, M.D. 1993. Large-scale disturbance features in northern Alaska affect regional carbon budgets. Bulletin of the Ecological Society of America. 74:(2):475.
100. Walker, M.D., Walker, D.A., Everett, K.R. 1989. Wetland soils and vegetation, Arctic Foothills, Alaska. Biological Report. 7(89). 89.
101. Walker, D.A. 1988. Terrain and vegetation types of the Sagavanirktok Quadrangle, Alaska. NASA-Ames University Consortium Final Report. 56 pp.
102. Acevedo, W., Walker, D.A. 1987. Vegetation and land cover, Beechey Point, Alaska. 1:250000.
103. Walker, D.A., Acevedo, W. 1987. Vegetation and a Landsat-derived land cover map of the Beechey Point Quadrangle, Arctic Coastal Plain, Alaska. CRREL Report 87-5. . 63 (plus Map L-0211).
104. Walker, D.A., Cate, D., Brown, J., Racine, C. 1987. Disturbance and recovery of arctic Alaskan tundra terrain: a review of recent investigations. CRREL Report 87-11. . 63.
105. Walker, D.A. 1985. Vegetation and environmental gradients of the Prudhoe Bay region, Alaska. CRREL Report 85-14. . 240. PDF
106. Simmons, C.L., Everett, K.R., Walker, D.A., Linkins, A.E., Webber, P.J. 1983. Sensitivity of plant communities and soil flora to seawater spills, Prudhoe Bay, Alaska. CRREL Report. . 35. PDF
107. Acevedo, W., Walker, D.A., Gaydos, L., Wray, J. 1982. Vegetation and land cover Arctic National Wildlife Refuge, Coastal Plain Alaska. 1:250,000. Department of the Interior. Washington, D.C..
108. Walker, D.A., Everett, K.R., Acevedo, W., Gaydos, L., Brown, J., Webber, P.J. 1982. Landsat-assisted environmental mapping in the Arctic National Wildlife Refuge, Alaska. CRREL Report 82-57. . 68.
109. Walker, D.A., Everett, K.R., Acevedo, W., Gaydos, L., Brown, J., Webber, P.J. 1982. Landsat assisted environmental mapping in the Arctic National Wildlife Refuge, Alaska. in U.S. Fish and Wildlife Service (eds.) Draft environmental impact statement and draft regulations for the proposed oil and gas exploration within the coastal plain of the Arctic National Wildlife Refuge, Alaska. Department of the Interior. Washington, D.C. pp. 829-890 with 3 maps.
110. Walker, D.A., Werbe, N. 1980. Dust impacts on vegetation. Environmental engineering and ecological baseline investigations along the Yukon River-Prudhoe Bay Haul Road. . 126-127.
111. Walker, D.A., Webber, P.J. 1980. Vegetation mapping. Environmental engineering and ecological baseline investigations along the Yukon River-Prudhoe Bay Haul Road. . 45-58.
112. Abele, G., Walker, D.A., Brown, J., Brewer, M.C., Atwood, D.M. 1978. Effects of low ground pressure vehicle traffic on tundra at Lonely, Alaska. CRREL Special Report 78-16. (78-16). 63.
113. Walker, D.A., Webber, P.J., Everett, K.R., Brown, J. 1977. The effects of low-pressure wheeled vehicles on plant communities and soils at Prudhoe Bay, Alaska. CRREL Special Report 77-17. . 49.
114. Webber, P.J., Walker, D.A. 1975. Vegetation and landscape analysis at Prudhoe Bay, Alaska: a vegetation map of the Tundra Biome study area. in Ecological investigations of the Tundra Biome in the Prudhoe Bay region, Alaska. pp. 81-91. PDF - Permanent link
115. Webber, P.J., Walker, D.A., Rowley, F. 1975. Gradient analysis of plant growth forms. in J. Brown (eds.) Ecological and limnological reconnaissances from Prudhoe Bay into the Brooks Range, Alaska. pp. 31-35. PDF

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Book reviews:

1. Kruckeberg, A.R. 2002. Geology and Plant Life: The Effects of Landforms and Rock Types on Plants. Reviewed in Ecoscience. 362.
2. Wielgolaski, F.E. 2000. Polar and Alpine Tundra. Reviewed in Arctic, Antarctic, and Alpine Research. 32:930. PDF
3. Mucinal, L., Pignatti, S., Rodwell, J.S., Schaminée, J.H.J., Chytrý, M. 1999. European Vegetation Survey: Case Studies. Reviewed in Journal of Vegetation Science. 10:(1):138. PDF - JSTOR
4. Rodwell, J.S., Pignatti, S., Mucina, L., Schaminée, J.H.J. 1995. European vegetation survey: update on progress. Reviewed in Journal of Vegetation Science. 10:(138):759-762.
5. Svoboda, J., Freedman, B. 1995. Ecology of a Polar Oasis. Reviewed in Arctic and Alpine Research. 286. PDF
6. Coates, P.A. 1992. The Trans-Alaska Pipeline Controversy: Technology, Conservation and the Frontier. Reviewed in Arctic and Alpine Research. 24:(4):363-364. PDF
7. Chapin, F.S., III 1989. Research in Arctic Life and Earth Sciences. Present Life and Future Perspectives. Reviewed in Arctic and Alpine Research. 21:(1):103-104. PDF - JSTOR
8. Sonesson, M. 1989. Research in Arctic life and earth sciences: present knowledge and future perspectives. Reviewed in Arctic and Alpine Research. 21:(1):103-104. PDF - JSTOR
9. Olson, R., Hastings, R., Geddes, F. 1986. Northern Ecology and Resource Management: Memorial Essays Honouring Don Gill. Reviewed in Arctic and Alpine Research. 18:(1):127-128.
10. Ritchie, J.C. 1985. Past and Present Vegetation of the Far Northwest of Canada. Reviewed in Arctic and Alpine Research. 17:(3):349-350. PDF
11. Walker, D.A. 1984. Permafrost: Fourth International Conference, Proceedings. Reviewed in Arctic and Alpine Research. 16:(1):127-128. PDF - JSTOR

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Unpublished papers and posters presented at conferences and workshops (*invited):

1. Walker, D.A., Bartsch, A., Bergstedt, H., Bhatt, U.S., Brown, J., Daanen, R., Epstein, E., Frost, G.V., Jones, B.M. & (...) Zwieback, S. 2022. 70-year retrospective of remote sensing applied to cumulative impact assessments, Prudhoe Bay Oilfield, Alaska. 16th International Circumpolar Remote Sensing Symposium. PDF
2. Bergstedt, H., Jones, B., Walker, D., Peirce, J, Bartsch, A. and Pointner, G. 2021. Quantifying the spatial and temporal influence of infrastructure on seasonal snow melt timing and its influence on vegetation productivity and early season surface water cover in the Prudhoe Bay Oilfields. EGU General Assembly. Online, 19-30 April 2021, EGU21-10296. . doi: 10.5194/egusphere-egu21-10296, 2021.
3. Walker, D.A., Raynolds, M.K., Kanevskiy, M.Z., Shur, Y., Romanovsky, V.E., Jones, B.M., Buchhorn, M., Jorgenson, M.T., Sibík, J., Breen, A.L., Watson-Cook, E., Bergstedt, H., Liljedahl, A., Daanen, R., Nikolsky, D., Connor, B. and Peirce, J.L. 2021. Cumulative impacts of a gravel road and climate change in an ice-wedge polygon landscape, Prudhoe Bay Oilfield, AK. Arctic Science Summit Week 2021 (Session 19). Online, 19-26 March. PDF
4. Bergstedt, H., Jones, B, Walker, D.A. Farquharson, L., Breen, A. and Hinkel, K. 2020. Mapping lake drainage and drained lake basins around Point Lay, Alaska using multi-source remote sensing data. EGU General Assembly 2020. Online, 4-8 May 2020, EGU2020-11919. . doi: 10.5194/egusphere-egu2020-11919.
5. Walker, D.A. and Peirce, J.L. 2020. Navigating the New Arctic with a focus on ground ice: Landscape evolution and adapting to change in ice-rich permafrost systems (NNA-IRPS). IARPC Permafrost Collaborations Team Meeting. Online, 19 February. PDF
6. Walker, D.A., Raynolds, M.K., Breen, A.L., Druckenmiller, L.A., Sibik, J., Epstein, H.E., Byatt, U.S. & Shaepman-Strub, G. 2019. Circumpolar Arctic vegetation classification, mapping, and transects: a framework for Arctic change monitoring and analysis. Arctic Science Summit Week, Arkhangelsk, Russia, 22-30 May. PDF
7. Walker, D.A., Peirce, J.L., Kumpula, T., Romanovsky, V., Schweitzer, P. & Vincent, W. 2019. RATIC-TMOSAiC connections and opportunities. Arctic Science Summit Week, Arkhangelsk, Russia, 22-30 May. PDF
8. Raynolds, M.K., Walker, D.A. & Raster CAVM Team 2019. Russia portion of the new Raster Circumpolar Arctic Vegetation Map (CAVM). Arctic Science Summit Week, Arkhangelsk, Russia, 22-30 May. PDF
9. Kumpula, T., Raynolds, M.K. & Walker, D.A. 2019. Mapping of Cumulative Impacts of Oil and Gas Development in Arctic Alaska and the Yamal Peninsula. Arctic Science Summit Week, Arkhangelsk, Russia, 22-30 May. PDF
10. Walker, D.A., Epstein, H.E., Sibik, J., Bhatt, U., Romanovsky, V., Breen, A.L., Chasnikova, S., Daanen, R., Druckenmiller, L.A. & (...) Timling, I. 2019. Vegetation along the 1700-km Yamal Peninsula-Franz Josef Land Eurasia Arctic Transect. Arctic Science Summit Week, Arkhangelsk, Russia, 22-30 May. PDF
11. Walker, D.A. 2019. Landscape evolution and adapting to change in ice-rich permafrost systems (NNA-IRPS). Institute of Arctic Biology (IAB) Life Sciences Seminar Series. October 25. PDF
12. Walker, D.A. 2019. Landscape evolution and adapting to change in ice-rich permafrost systems (NNA-IRPS). Bridging Science, Art, and Community in the New Arctic. UVA, Charlottesville, Virginia, 23-25 September. PDF
13. Raynolds, M.K., and Walker, D.A. 2018. A raster-based circumpolar arctic vegetation map. 48th Annual International Arctic Workshop, Boulder, CO, April 5-6. - Abstract, p. 45
14. Walker, D.A. 2018. Vegetation of the European Arctic Transect (EAT) Yamal Peninsula and Franz Jozef Land, Russia. Arctic Biomass Workshop, Longyearbyn, Svalbard, 9-12 October.
15. Walker, D.A., Kanevskiy, M., Shur, Y., Raynolds, M., Buchhorn, M. and Matyshak, G. 2017. Rapid transitions caused by infrastructure and climate, Prudhoe Bay oilfield, Alaska, USA. Arctic Science Summit Week, Prague, CZ, 31 March-7 April. PDF - Abstract O 115, p. 171
16. Walker, D.A., Breen, A.L., Druckenmiller, L.A., Sibi­k, J., Hennekens, S., Daniels, F.J.A., Matveyeva, N.V., MacKenzie, W.H., Walker, M.D. & Wirth, L.M. 2017. An Arctic Vegetation Archive for circumpolar arctic vegetation classification. Arctic Science Summit Week, Prague, CZ, 31 March-7 April. PDF - Abstract P 150, p. 137
17. Epstein, H., Walker, D., Sibik, J., Chasnikova, S., Frost, G., Leibman, M., Matyshak, G. & Raynolds, M. 2017. Vegetation community and ecosystem properties along the Eurasian Arctic Transect (EAT). Arctic Science Summit Week, Prague, CZ, 31 March-7 April. PDF - Abstract O 065, p. 139
18. Matyshak, G., Walker, D.A., Epstein, H.E., Leibman, M.O., Moskalenko, N.G. & Orekhov, P.T. 2017. Characteristics of cryogenic soils along the latitudinal transect in the northwestern Siberia, Russia. Arctic Science Summit Week, Prague, CZ, 31 March-7 April. PDF - Abstract O 066, p. 141
19. Walker, D.A., Sibik, J., Chasnikova, S., Epstein, H.E., Ermokhina, K., Frost, G.V., Kaarlejarvi, E., Khitun, O., Khumotov, A., Kuss, P., Leibman, M.O., Matyshak, G., Moskalenko, N., Orekhov, P. & Raynolds, M.K. 2017. Vegetation of the European Arctic Transect (EAT), Yamal Peninsula and Franz Jozef Land, Russia. Arctic Science Summit Week, Prague, CZ, 31 March-7 April. PDF - Abstract O 064, p. 142
20. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Epstein, H.E., Bieniek, P.A., Comiso, C., Pinzon, J.E. and Tucker, C.J. 2017. Humidification of the Arctic: Effects of changing sea-ice on summer land temperatures, continentality and NDVI along transects in Eurasia and North America. Svalbard Biomass Workshop, 9-12 October, Longyearbyen, Norway.
21. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Comiso, J.C., Pinzon, J.E. and Tucker, C.J. 2017. Climate Drivers of Tundra Vegetation Greening/Browning in the Arctic. IARC Salon, April 13, Fairbanks, Alaska.
22. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Comiso, J.C., Pinzon, J.E. and Tucker, C.J. 2017. Possible causes of arctic tundra vegetation productivity declines (Invited). AGU Fall Meeting, 11-15 December, New Orleans, LA. - Abstract B43J-01
23. Bhatt, U.S., Walker, D.A., Raynolds, M.K. and Epstein, H.E., 2017. Humidification of the Arctic. Effects of more open ocean water on land temperatures and tundra productivity along continental and maritime bioclimate transects (Invited). AGU Fall Meeting, 11-15 December, New Orleans, LA. - Abstract B41A-1923
24. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Comiso, J.C., Pinzon, J.E. and Tucker, C.J. 2017. On understanding the climate drivers of tundra vegetation greening/browning in the Arctic. Chapman Chair Symposium, September 3, Fairbanks, Alaska.
25. Romanovsky, V., Nicolsky, D., Cable, W., Kholodov, A., Farquharson, L., Panda, S., et al. 2017. Measured and modeled changes in permafrost along North American Arctic Transect. Arctic Science Summit Week, Prague, CZ, 31 March-7 April.
26. Walker, D.A. 2017. Arctic transects as a concept: examples from Russia & North America: what do transects offer that normal one-site studies do not?. SVAL-GREEN Workshop, 22-24 May, Longyearbyn, Svalbard.
27. Walker, D.A. 2017. Cumulative effects of arctic oil development: planning for a sustainable future. Kuukpik UAF Workshop, UAF, Fairbanks, AK, June 5.
28. Walker, D.A. 2017. Vegetation of the European Arctic Transect (EAT) Yamal Peninsula and Franz Jozef Land, Russia. Slovak Academy of Sciences, Institute of Botany, Bratislava, Slovak Republic, 12 April.
29. Walker, D.A., Epstein, H.E., Raynolds, M.K., Buchhorn, M., Kumpula, T., Forbes, B.C., Leibman, M.O., Khomutov, A., Matyshak, G.V., Curry, T., Kofinas, G., Romanovsky, V., Shur, Y. and Kanevskiy, M.Z. 2016. Yamal LCLUC Synthesis. Science Team Meeting, Bethesda, MD, April 18-19. PDF
30. Walker, D.A., Epstein, H.E., Raynolds, M.K., Buchhorn, M., Kumpula, T., Forbes, B.C., Leibman, M.O., Khomutov, A., Matyshak, G.V., Curry, T., Kofinas, G., Romanovsky, V., Shur, Y. and Kanevskiy, M.Z. 2016. Yamal LCLUC Synthesis: Comparison of infrastructure development and consequences to social-ecological systems in the Bovanenkovo Gas Field, Russia and the Prudhoe Bay Oilfield, Alaska. Science Team Meeting, Bethesda, MD, April 18-19. PDF
31. Walker, D.A., Kanevskiy, M., Shur, Y., Raynolds, M.K. and Buchhorn, M. 2016. Effects of infrastructure, climate change, and icewedge degradation, Prudhoe Bay oilfield, Alaska. AGU Fall Meeting, San Francisco, CA, December 12-16. PDF - Abstract
32. Walker, D.A. 2016. NASA ABoVE All-scientists Presentation: A hierarchic framework for studying Arctic vegetation. NASA ABoVE All-scientists Meeting, Anchorage, AK, January 19-22. PDF
33. Buchhorn, M., Raynolds, M.K., Walker, D.A., M. Willis, M., Wirth, L.M., Kanevskiy, M., Matyshak, G., Shur, Y., and Peirce, J. 2016. Effects of 45 years of heavy road traffic and climate change on the thermal regime of permafrost and tundra at Prudhoe Bay, Alaska. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. pp. 1203-1205. PDF - Abstract, pp. 1203-1205. doi: 10.2312/GFZ.LIS.2016.001.
34. Epstein, H.E., Walker, D.A., Frost, G.V., Raynolds, M.K., and Bhatt U.S. 2016. Vegetation Biomass, NDVI, and LAI along the Eurasian Arctic Transect. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. pp. 900-901. PDF - Abstract, pp. 900-901. doi: 10.2312/GFZ.LIS.2016.001.
35. Frost, G., Epstein, H., Walker, D. and Matyshak, G. 2016. Changes to Active-Layer Temperature after Tall Shrub Expansion in Arctic Tundra. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. pp. 410-411. PDF - Abstract, pp. 410-411. doi: 10.2312/GFZ.LIS.2016.001.
36. Kanevskiy, M., Shur, Y., Walker, D.A., Buchhorn, M., Jorgensen, M.T., Matyshak, M., Raynolds, M.K., Peirce, J.L. and Wirth, L.M. 2016. Evaluation of Risk of Ice-Wedge Degradation, Prudhoe Bay Oilfield, Alaska. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. pp. 999-1001. PDF - Abstract, pp. 999-1001. doi: 10.2312/GFZ.LIS.2016.001.
37. Shur, Y., Kanevskiy, M., Walker, D.A., Jorgensen, T., Buchhorn, M., Raynolds, M.K. and Toniolo, H. 2016. Permafrost-Related Causes and Consequences of the Sagavanirktok River Delta Flooding in Spring 2015. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. pp. 1014-1016. PDF - Abstract, pp. 1014-1016. doi: 10.2312/GFZ.LIS.2016.001.
38. Walker, D.A., Epstein, H.E. Leibman, M., Khomutov, A., Moskolenko, N., Orekhov, P., Matyshak, G., Frost, G.V., Khitun, O., Chasnikova, S., Sibik, J., Kaarlejarvi, E. and Kuss, J.P. 2016. Eurasia Arctic Transect: Vegetation-environment-permafrost relationships. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. pp. 933-934. PDF - Abstract, pp. 933-934. doi: 10.2312/GFZ.LIS.2016.001.
39. Walker, D.A., Peirce, J.L., Kumpula, T., Liebman, M.O., Matyshak, G., Streletskiy, D., Raynolds, M.K., Shur, Y.S., Kanevskiy, M., Buchhorn, M., Kofinas, G., Ambrosius, K., Epstein, H.E., Romanovsky, V., Forbes, B.C., Khumotov, A., Khitun, O., Shiklomnanov, N., Grebenets, V., Lemay, M., Allard, M., Vincent, W., Lamoureux, S., Bell, T., Forbes, D., Fondahl, G., Kuznetsova, E., Roy, L-P, Petrov, A. and Schweitzer, P. 2016. Rapid Arctic Transitions due to Infrastructure and Climate (RATIC): An ICARP III initiative focusing on the cumulative effects of Arctic infrastructure and climate change. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. pp. 1234-1236. PDF - Abstract, pp. 1234-1236. doi: 10.2312/GFZ.LIS.2016.001.
40. Frost, G. V., Christopherson, T. C., Liljedahl, A. K., Macander, M. J., Walker, D. A. and Wells, A. F. 2016. Regional patterns and asynchronous onset of ice-wedge degradation in Arctic Alaska. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. p. 32. - Abstract, p. 32. doi: 10.2312/GFZ.LIS.2016.002.
41. Heim, B., Bartsch, A., Beamish, A., Stettner, S., Buchhorn, M., Duguay, C., Hoegstroem, E., Widhalm, B., Elger, K., and Walker, D.A. 2016. User and expert-supported validation and evaluation experiments for high latitude permafrost landscapes. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. p. 904. - Abstract, p. 904. doi: 10.2312/GFZ.LIS.2016.003.
42. Liljedahl, A.K., Boike, J., Daanen, R. P., Fedorov, A. N., Frost, G. V., Grosse, G., Hinzman, L., Iijima, Y., Jorgenson, J.C., Matveyeva, N., Necsoiu, M., Raynolds, M.K., Romanovsky, V., Schulla, J., Tape, K.D., Walker, D.A., Wilson, C.J., and Yabuki, H. 2016. Recent circum-Arctic ice-wedge degradation and its hydrological impacts. XI. International Conference On Permafrost - Book of Abstracts, 20-24 June 2016, Potsdam, Germany. p. 917. - Abstract, p. 917. doi: 10.2312/GFZ.LIS.2016.004.
43. Raynolds, M.K., and Walker, D.A. 2016. A raster version of the Circumpolar Arctic Vegetation Map (CAVM. 14th International Circumpolar Remote Sensing Symposium, Homer, AK, September 12-16. - Abstract, p. 95
44. Buchhorn, M., Curry, T., Kanevskiy, M., Raynolds, M.K., Shur, Y. and Walker, D.A. 2015. Landscape,  permafrost, and social change in the Prudhoe Bay region, Alaska: Snapshots from the NSF-ArcSEES project. Institute of Arctic Biology (IAB) Life Sciences Seminar Series. January 23. PDF
45. Walker, D.A., Bhatt, U.S., Breen, A.L., Buchhorn, M., Druckenmiller, L.A., Kade, A., Murray, D.F., Peirce, J.L., Raynolds, M.K., Wirth, L.M., Daniëls, F.J.A., Bültmann, H., Alsos, I., Ehrich, D., Ims, R.A., Edwards, M.E., Epstein, H.E., Gould, W.A., Meltofte, H., Talbot, S.S., Šibík, J., Hennekens, S., Walker, M.D., Cooper, D.J., Ebersole, J.J., Elmendorf, S.C., Hollister, B.D., Webber, P.J., Iversen, C., Sloan, V., Jorgenson, M.T., Lee, M.T., Peet, R.K., MacKenzie, M.H., Schickhoff, U., Tweedie, C.E. and Villarreal, Sl 2015. A hierarchic approach to examining panArctic vegetation with a focus on the linkages between remote sensing and plot-based studies. AGU Fall Meeting. San Francisco, CA, December 14 - 18. PDF - Abstract B53C-0577
46. *Walker, D.A., Peirce, J.L., Kumpula, T., Liebman, M.O., Matyshak, G., Streletskiy, D., Raynolds, M.K., Shur, Y.S., Kanevskiy, M., Buchhorn, M., Kofinas, G., Ambrosius, K., Epstein, H.E., Romanovsky, V., Forbes, B.C., Khumotov, A., Khitun, O., Shiklomnanov, N., Grebenets, V., Lemay, M., Allard, M., Vincent, W., Lamoureux, S., Bell, T., Forbes, D., Fondahl, G., Kuznetsova, E., Roy, L-P, Petrov, A. and Schweitzer, P. 2015. Rapid Arctic Changes due to Infrastructure and Climate (RATIC) in the Russian North. AGU Fall Meeting, San Francisco, CA, December 14-18. PDF - Abstract GC31B-1183
47. Buchhorn, M., Raynolds, M.K., Walker, D.A., Kanevskiy, M., Matyshak, G., Shur, Y., Wirth, L.M. and Peirce, J. 2015. Effects of 45 Years of Heavy Road Traffic and Infrastructure on Permafrost and Tundra at Prudhoe Bay, Alaska. AGU Fall Meeting. San Francisco, CA, December 14 - 18. PDF - Abstract GC23J-1215
48. Bhatt, U.S., Walker, D.A., Bieniek, P., Epstein, H., Comiso, J., Pinzon, J. and Tucker, C.J. 2015. Climate variations and Alaska tundra vegetation productivity declines in spring. AGU Fall Meeting. San Francisco, CA, December 14 - 18. PDF - Abstract GC11F-1083
49. *Epstein, H.E., Bhatt, U.S., Raynolds, M.K., Walker, D.A. and Reichle, L.M. 2015. Circumpolar dynamics of Arctic tundra vegetation in relation to temperature trends. AGU Fall Meeting. San Francisco, CA, December 14 - 18. PDF - Abstract GC13K-04
50. Frost, G.V., Christpherson, T., Liljedahl, A., Macander, M.J., Walker, D.A. and Wells, A.F. 2015. Regional Patterns of Ice-Wedge Degradation Across Northern Alaska: What Does Asynchronous Timing of Onset Tell Us Regarding Triggering Mechanisms, Thresholds, and Impacts?. AGU Fall Meeting. San Francisco, CA, December 14 - 18. PDF - Abstract C21C-0750
51. *Liljedahl, A., Daanen, R., Fedorov, A., Grosse, G., Hinzman, L., Iijima, Y., Jorgenson, J., Matveyeva, N., Necsoiu, M., Raynolds, M.K., Romanovsky, V., Schulla, J., Tape, K., Walker, D.A., Wilson, C. and Yabuki, H. 2015. Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier. AGU Fall Meeting. San Francisco, CA, December 14 - 18. PDF - Abstract C21C-0749
52. *Rousseau, D-D. (convenor) 2015. AGU-EGU Great Debate on "Sustainable Development of the Arctic". AGU Fall Meeting. San Francisco, CA, December 14 - 18. - Abstract U21A
53. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H. E., Comiso, J.C., Pinzon, J.E., Tucker, C.J., Steele, M.A., Ermold, W. and Zhang, J. 2015. Changing seasonality of tundra vegetation in relationship to climatic variables. IARC Summer School 2015. Fairbanks, AK, May 2015.
54. Walker, D.A., Epstein, H.E., Forbes, B.C., Kofinas, G., Kumpula, T., Leibman, M.O., Romanovsky, V.E., Shur, Y., Ambrosius, K., Bhatt, U.S., Currie, T., Buchhorn, M., Kanevskiy, M.Z., Khomutov, A., Matyshak, G., Raynolds, M.K. 2015. Oral presentation at the 3rd International Conference on Arctic Research Planning (ICARP III). Yohama, Japan, April 23-30.
55. Walker, D.A., Raynolds, M.K., Kumpula, T., Shur, Y., Kanevskiy, M.Z., Leibman, M.O., Khomutov, A., Ambrosius, K., Buchhorn, M., Epstein, H.E., Forbes, B.C., Kofinas, G., Maytshak, G.V., Romanovsky, V. and Wirth, L. 2014. Rapid Arctic Transitions in Relation to Infrastructure and Climate Change: Comparison of the Permafrost and Geoecological Conditions in the Bovanenkovo Gas Field, Russia and the Prudhoe Bay Oil Field, Alaska. AGU Fall Meeting. San Francisco, December 15 - 19. PDF - Abstract
56. Walker, D.A. 2014. Arctic Vegetation Sampling: Vegetation sampling, Biomass, NDVI, LAI, Zonal concept, Arctic Vegetation Archive. ArcticBiomass Workshop. Fairbanks, AK, September 2-3. PDF
57. Walker, D.A, Bhatt, U.S., Muchhorn, M., Comiso, J., Epstein, H.E., Ermokhina, K., Forbes, B., Frost, G., Heim, B., Kofinas, G., Khumotov, A., Kumpula, T., Leiman, M., Matyshak, G., Pinzon, J., Raynolds, M.K., Romanovsky, V., Tucker, C., Wirth, L. and Yu, Q. 2014. SYN-YAMAL: A synthesis of remote-sensing studies, ground observations and modeling to understand the social-ecological consequences of climate change and resource development on the Yamal Peninsula, Russia, and relevance to the circumpolar Arctic. Arctic Change 2014. Ottawa, ON, December 8-12. PDF
58. Bhatt, U.S., Walker, D.A. Bieniek, P.A. Raynolds, M.K. Epstein, H.E. Comiso, J.C. Pinzon, J. Tucker, C.J. 2013. Links between Pan-Arctic Tundra Vegetation Change and Climate. Seminar at Geophysical Institute, University of Bergen. Bergen, Norway February 20. PDF
59. Breen, A., Raynolds, M.K., Hennekens, S.M., Walker, D.A. 2013. Toward an Arctic Alaska Prototype for the Arctic Vegetation Archive. Arctic Vegetation Archive. Krakow, Poland . PDF
60. Raynolds, M.K., Breen, A.L., Hennekens, S.M., Walker, D.A., Elven, R., Belland, R., Konstantinova, N.A., Kristinsson, H. 2013. The Pan-Arctic Species List (PASL). Arctic Vegetation Archive. Krakow, Poland 14-16 April. PDF
61. Walker, D.A. 2013. International Arctic Vegetation Database. IASC Terrestrial Working Group Meeting. Krakow, Poland 13 April. PDF
62. Walker, D.A. 2013. Concluding Day. Arctic Vegetation Archive. Krakow, Poland 14-16 April. PDF
63. Walker, D.A. 2013. The Arctic Vegetation Archive Workshop, 14-16 April 2013, Kraków, Poland: Welcome and Agenda. Arctic Vegetation Archive. Krakow, Poland 14-16 April. PDF
64. Walker, D.A. 2013. Fred Daniëls key role through 21 years of History of the AVA. Arctic Vegetation Archive. Krakow, Poland 14-16 April. PDF
65. Walker, D.A. 2013. The Arctic Vegetation Archive (AVA). Arctic Science Summit Week. Krakow, Poland 13-19 April. PDF
66. Walker, D.A. 2013. Recovery and archiving of key Arctic Alaska vegetation map and plot data for long-term vegetation analyses: A proposal to NASA for data recovery for the Arctic-Boreal Vulnerability Experiment (Pre-ABoVE). Arctic Vegetation Archive. Krakow, Poland 14-16 April. PDF
67. Walker, D.A. 2013. Arctic Vegetation Archive: History and goals for the workshop. Arctic Vegetation Archive. Krakow, Poland 14-16 April. PDF
68. Walker, D.A. 2013. Yamal LCLUC Synthesis: A synthesis of remote-sensing studies, ground observations and modeling to understand the social-ecological consequences of climate change and resource development on the Yamal Peninsula, Russia and relevance to the circumpolar Arct. Proposal to the National Aeronautics and Space Administration. PDF
69. Walker, D.A., Epstein, H.E., Bhatt, U.S., Leibman, M.O., Forbes, B.C., Romanovsky, V.E., Kofinas, G., Kumpula, T., Raynolds, M.K., Frost, G.V., Yu, Q., Bieniek, P.A., Orekhov, P., Matyshak, G., Moskalenko, N., Ukraientseva, N., Khumotov, A., Ermokina, K., Comiso, J.C., Pinzon, J., Tucker, C.J., Meschtyb, N., Stammler, F. 2012. A hierarchical analysis of land-cover and land-use change in tundra environments: Remote sensing, ground-based observations of social and ecological factors, and models. 2012 NASA LCLUC Science Team meeting, Rockville, MD, April 3-5, 2012. PDF
70. Walker, D.A., Matyshak, G., Frost, G.V., Zhurbenko, M., Afonina, O. 2012. High cover, biomass, and NDVI of biological soil crusts on Hayes Island, Franz Josef Land, Russia. Tenth International Conference on Permafrost, Salekhard, Russia June 25-29, 2012. PDF
71. Walker, D.A., Epstein, H.E., Bhatt, U.S., Leibman, M.O., Forbes, B.C., Romanovsky, V.E., Kofinas, G., Kumpula, T., Raynolds, M.K., Frost, G.V., Yu, Q., Bieniek, P.A., Orekhov, P., Matyshak, G., Moskalenko, N., Ukraientseva, N., Khumotov, A., Ermokhina, K., Drozdov, D., Comiso, J.C., Pinzon, J., Tucker, C.J., Meschtyb, N., Stammler, F., Khitun, O.V. 2012. Greening of the Arctic Project (IPY-GOA, project ID 569). From Knowledge to Action, 2012 IPY Conference, Montreal, Quebec, May 22-27, 2012. PDF
72. Walker, D.A. 2012. Summary of the IPY Greening of the Arctic Project. Institute of Arctic Biology Seminar. Fairbanks, AK April 6. PDF
73. Raynolds, M.K., Walker, D.A., Kofinas, G.P., Ambrosius, K.J. 2012. 60 Years of Landscape Change within an Arctic Oilfield, Prudhoe Bay, Alaska. 12th Circumpolar Remote Sensing Symposium, Levi, Finland, May 14-18, 2012. PDF
74. Breen, A., Raynolds, M.K., Walker, D.A., Hennekens, S.M. 2012. Toward a Panarctic Species List. International Arctic Vegetation Database Workshop. Roskilde, Denmark May 29-31. PDF
75. Walker, D.A., Raynolds, M.K., Breen, A., Daniëls, F.J.A., Talbot, S.S., Hennekens, S.M., Peet, R.K., Murray, D.F., Walker, M.D. 2012. An International Arctic Vegetation Database. International Arctic Vegetation Database Workshop. Roskilde, Denmark May 29-31. PDF
76. Walker, D.A., Raynolds, M.K. and Breen, A. 2012. Survey of Arctic relevé data and a Northern Alaska IAVD prototype. International Arctic Vegetation Database Workshop. Roskilde, Denmark May 29-31. PDF
77. Walker, D.A. 2012. The idea of Greenland transects in the context of the IPY Greening of the Arctic project and Greenland biodiversity. International Arctic Vegetation Database Workshop. Roskilde, Denmark May 29-31. PDF
78. Yu, Q., Epstein, H.E., Walker, D.A., Forbes, B.C. 2012. Dynamics of Circum-Arctic Tundra Plant Communities in Response to Climate Warming and Grazing Pressure. From Knowledge to Action, 2012 IPY Conference, Montreal, Quebec, May 22-27, 2012. PDF
79. Bhatt, U.S., Walker, D.A., Bieniek, P.A., Raynolds, M.K., Epstein, H.E., Comiso, J.C., Pinzon, J., Tucker, C.J. 2012. Drivers of Recent Pan-Arctic Tundra Vegetation Variability and Change. From Knowledge to Action, 2012 IPY Conference, Montreal, Quebec, May 22-27, 2012. PDF
80. Epstein, H.E., Raynolds, M.K., Walker, D.A., Bhatt, U.S., Tucker, C.J., Pinzon, J.E., Frost, G.V., Yu, Q., Jia, G.J., Zeng, H. 2012. Recent dynamics of arctic tundra vegetation: Remote sensing, field observations, and modeling. From Knowledge to Action, 2012 IPY Conference, Montreal, Quebec, May 22-27, 2012. PDF
81. Epstein, H.E., Yu, Q., Frost, G.V., Raynolds, M.K., Walker, D.A., Bhatt, U.S., Tucker, C.J., Pinzon, J.E. 2012. Climate and grazing influences on circumpolar dynamics of arctic tundra vegetation. 12th Circumpolar Remote Sensing Symposium, Levi, Finland, May 14-18, 2012. PDF
82. Frost, G.V., Epstein, H.E., Matyshak, G., Ermokhina, K., Walker, D.A. 2012. Summary of Kharp field expedition, July 2011. Third Yamal Land-Cover Land-Use Change Workshop, Rovaniemi, Finland, May 19-20, 2012. PDF
83. Frost, G.V., Epstein, H.E., Walker, D.A., Yu, Q. 2012. Expansion and patch dynamics of alder shrublands in the Siberian Low Arctic: evidence from remote-sensing spanning the Space Age. 12th Circumpolar Remote Sensing Symposium, Levi, Finland, May 14-18, 2012. PDF
84. Raynolds, M.K., Walker, D.A., Kofinas, G.P., Ambrosius, K.J. 2012. Sixty years of landscape change within an Artic Oilfield, Prudhoe Bay, Alaska. Third Yamal Land-Cover Land-Use Change Workshop, Rovaniemi, Finland, May 19-20, 2012. PDF
85. Walker, D.A. 2012. Summary of the Greening of the Arctic Project. Third Yamal Land-Cover Land-Use Change Workshop, Rovaniemi, Finland, May 19-20, 2012. PDF
86. Walker, D.A., Raynolds, M.K., Breen, A., Daniëls, F.J.A., Talbot, S.S., Hennekens, S.M., Peet, R.K., Murray, D.F., Walker, M.D. 2012. An International Arctic Vegetation Database. European Vegetation Survey 21st Workshop. Vienna, Austria May 24-27. PDF
87. Walker, D.A., Webber, P.J., Brown, J., Raynolds, M.K., Streever, W., Ambrosius, K. 2012. The evolution of the Integrated Geobotanical and Historical Change Mapping (IGHCM) approach for documenting landscape change (1949-2010), Prudhoe Bay oil field, AK, USA. 12th Circumpolar Remote Sensing Symposium, Levi, Finland, May 14-18, 2012. PDF
88. Frost, G.V., Epstein, H.E., Walker, D.A., Matyshak, G., Ermokhina, K. 2012. Feedbacks between shrubland development and permafrost in the northwest Siberian Low Arctic. 12th Circumpolar Remote Sensing Symposium, Levi, Finland, May 14-18, 2012. PDF
89. Frost, G.V., Epstein, H.E., Walker, D.A., Matyshak, G., Ermokhina, K. 2012. Feedbacks between shrubland development and permafrost in the northwest Siberian Low Arctic. From Knowledge to Action, 2012 IPY Conference, Montreal, Quebec, May 22-27, 2012. PDF
90. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2011. Seasonal changes of the ice-ocean-atmosphere-terrestrial system on the Yamal. LCLUC Science Team Meeting. Adelphi, MD March 28-30. PDF
91. Epstein, H.E., Yu, Q., Frost, G.V., Raynolds, M.K., Walker, D.A., Forbes, B.C. 2011. Effects of climate, grazing, and gas development on tundra ecosystems of the Yamal Peninsula, northwestern Siberia. LCLUC Science Team Meeting. Adelphi, MD . PDF
92. Stevens, D.S.P., Jorgensen, M.T., Walker, D.A., Brown, J. 2011. Permafrost Information Enhanced by New Guide Books from the Ninth International Conference on Permafrost. 2011 Association of American Geographers Annual Meeting. Seattle, WA April 12-16. PDF
93. Walker, D.A. 2011. Biocomplexity of small patterned-ground features. Arctic Ecology Course. Masaryk University, Brno, Czech Republic March 8. PDF - PPT
94. *Walker, D.A. 2011. Arctic vegetation along two long bioclimatic transects in North America and Russia. Fulbright Lecture, Botany Dept., Masarysk University. Brno, Czech Republic March 10. PDF
95. *Walker, D.A. 2011. Greening of the Arctic: Climate change and circumpolar Arctic vegetation. Fulbright Lecture, Cesko Budovice University. Cesko Budovice, Czech Republic April 27. PDF
96. *Walker, D.A. 2011. Socio-ecological effects of oil and gas development in the Arctic: Comparison of the Prudhoe Bay, Alaska and Bovanenkova, Russia regions. Earth Day, 20th Celebration of the Czech Fulbright Commission. American Center, Prague, Czech Republic April 21. PDF
97. Walker, D.A., Barbour, E.M., Maier, H.A. 2011. Toolik-Arctic Geobotanical Atlas: A plant-to-planet volume of maps and related information produced by the Alaska Geobotany Center. - Toolik-Arctic Geobotanical Atlas
98. Walker, D.A., Raynolds, M.K., Epstein, H.E., Bhatt, U.S., Frost, G.V., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2011. Greening of the Arctic: Spatial variation of biomass and NDVI along two Arctic transects and the Circumpolar Arctic. LCLUC Science Team Meeting. Adelphi, MD March 28-30. PDF
99. Yu, Q., Epstein, H.E., Walker, D.A. 2011. Modeling dynamics of tundra plant communities on the Yamal Peninsula. LCLUC Science Team Meeting. Adelphi, MD March 28-30. PDF
100. Walker, D.A. 2011. Vulnerability, Impacts and Adaptations of Arctic Social-Ecological Systems. Proposal to the National Aeronautics and Space Administration. PDF
101. Walker, D.A., Bienek, P., Bhatt, U.S., Raynolds, M.K., Epstein, H.E., Jia, G.J., Comiso, J.C., Tucker, C.J., Pinzon, J., Liebman, M.O., Forbes, B.C., Kumpula, T. 2011. The Arctic Tundra is a maritime biome. High latitude trace gas exchanges: the role of ocean-land interactions. Nuuk, Greenland September 19-22. PDF
102. Walker, D.A. 2011. Welcome to IASC. Understanding Biodiversity Changes and Causes - Synergies in Arctic Terrestrial Biodiversity Research and Monitoring. Sonnerupgaard Gods, Hvalsø, Denmark 12 October. PDF
103. Walker, D.A. 2011. Multi-scale monitoring of Arctic vegetation. Terrestrial Expert Monitoring Group Inaugural Workshop. Sonnerupgaard Gods, Hvalsø, Denmark 10-14 October. PDF
104. Bhatt, U.S., Walker, D.A., Raynlds, M.K, Bieniek, P., Comiso, J.C., Pinzon, J.E., and Tucker, C.J. 2011. The role of seasonality and large-scale climate drivers in recent Pan-Arctic tundra vegetation variability and change. AGU Fall Meeting. San Francisco, CA, December 5-9. PDF - GC51F-1075, Friday, Dec. 9, session GC51F
105. Leibman, M.O., Moskalenko, N.G., Orekov, P.T., Khomutov, A.V., Walker, D.A., Epstein, H.E. 2011. Interaction of cryogenic and biotic components in cryolithozone of the West Siberia along the Yamal transect. in Polar cryosphere and hydrosphere of the Land.
106. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Bieniek, P.A., Epstein, H.E., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2011. Understanding Recent Arctic Tundra Vegetation Changes. World Climate Research Programme Open Science Conference. Denver, CO October 24. PDF
107. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Jia, G.J., Gens, R., Pinzon, J., Tucker, C., Tweedie, C., Webber, P. 2010. Circumpolar Arctic tundra vegetation change is linked to sea-ice decline. State of the Arctic Meeting. Miami, Fl March 16-19. PDF
108. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J. 2010. Seasonality of the atmosphere-ocean-ice-terrestrial environment of Arctic tundra. State of the Arctic Meeting. Miami, FL March 16-19. PDF
109. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2010. Climatology and Seasonality of the ice-ocean-atmosphere-terrestrial system on the Yamal. Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland 8-10 March. PDF
110. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2010. Circumpolar arctic tundra vegetation change is linked to sea-ice decline. Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
111. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2010. Climatology and variability of the ice-ocean-atmosphere-terrestrial system on the Yamal. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD April 20-22. PDF
112. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Steele, M., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2010. Circumpolar arctic tundra vegetation change is linked to sea-ice decline. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 31 March-2 April.
113. Epstein, H.E., Walker, D.A., Raynolds, M.K., Kelley, A.M., Jia, G.J., Ping, C.L., Michaelson, G., Leibman, M.O., Kaarlejärvi, E., Khomutov, A.V., Kuss, H.P., Moskalenko, N.G., Orechov, P., Matyshak, G., Forbes, B.C., Yu, Q. 2010. Vegetation biomass, leaf area index, and NDVI patterns and relationships along two latitudinal transects in arctic tundra. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 20-22 April. PDF
114. Epstein, H.E., Walker, D.A., Raynolds, M.K., Kelley, A.M., Jia, G.J., Ping, C.L., Michaelson, G.J., Leibman, M.O., Kaarlejärvi, E., Khomutov, A.V., Kuss, P., Moskalenko, N.G., Orechov, P., Matyshak, G., Forbes, B.C. 2010. Vegetation biomass, leaf area index, and NDVI patterns and relationships along two latitudinal transects in Arctic tundra. State of the Arctic Meeting. Miami, FL 16-19 March. PDF
115. *Forbes, B.C., Murray, M.S., Walker, D.A. 2010. Human dimensions of land-cover and land-use change in the Arctic with a focus on the Yamal Peninsula, Russia. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD April 20-22. PDF
116. Frost, G.V., Epstein, H.E., Walker, D.A. 2010. Spatio-temporal dynamics in tree and tall shrub cover near Kharp, northwest Siberia: 2009 field observations and proposed 2010 study plan. Yamal Land-Cover land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
117. Frost, G.V., Epstein, H.E., Walker, D.A. 2010. Summary of 2009 field observations and proposed 2010 study plan for Kharp study site, northwest Siberia. Yamal Land-Cover land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
118. Frost, G.V., Epstein, H.E., Walker, D.A. 2010. Spatio-temporal trends in tree and shrub cover in the circumpolar Low Arctic: Evidence from 1960s satellite photography and ground observations. State of the Arctic Meeting. Miami, FL March 16-19.
119. Frost, G.V., Epstein, H.E., Walker, D.A. 2010. Spatio-temporal dynamics in tree and tall shrub cover near Kharp, northwest Siberia. Land Cover, Land Use Change Spring Science Team Meeting Bethesda, MD April 20-22. PDF
120. Frost, G.V., Walker, D.A., Raynolds, M.K., Epstein, H.E. 2010. Ordination and gradient analysis of Yamal Peninsula releve data. Second Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland March 8-10. PDF
121. Jia, G.J., Epstein, H.E., Walker, D.A., Raynolds, M.K., Yonghong, H., Tucker, C. 2010. Satellite view of changing phenological patterns over Arctic tundra biome. State of the Arctic Meeting. Miami, FL March 16-19.
122. Jia, G.J., Hu, Y., Wang, H., Epstein, H.E., Walker, D.A. 2010. Greening and Seasonality: Multi-scale Approaches. Yamal Land-Cover land-Use Change Workshop. Rovaniemi, Finland 8-10 March 2010. PDF
123. Maier, H.A., Walker, D.A. 2010. Ostrov Belyy (White Island), Yamal Peninsula region, Russia: Landsat ETM+ false color image, land-cover map, and NDVI map (1:200K scale). Second Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
124. Maier, H.A., Walker, D.A. 2010. Yamal Peninsula, Russia: Landsat TM Mosaic Image (1:1M scale), Land-Cover Maps and NDVI Maps of the LCLUC Study Areas (1:250K-1:300K scales). Second Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
125. Maier, H.A., Walker, D.A. 2010. Application of Global Land Survey data to land-cover mapping: Yamal Peninsula, Russia. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD April 20-22. PDF
126. Raynolds, M.K., Walker, D.A., Bhatt, U.S., Pinzon, J.E., Comiso, J.C. 2010. NDVI trends 1981-2008 in the circumpolar Arctic and Yamal. Yamal Land-Cover land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
127. Walker, D.A. 2010. An integrated mapping approach and suggestions for incorporating tundra into the CBVM legend. Circum-Boreal Vegetation Mapping Workshop. Helsinki, Finland March 12-14.
128. Walker, D.A. 2010. Is Arctic refuge grass greener?. Fairbanks Daily News-Miner. PDF - Fairbanks Daily News-Miner
129. Walker, D.A. 2010. Welcome, goals of the workshop, and overview of the project. Second Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland 8-10 March. PDF
130. Walker, D.A., Epstein, H.E., Bhatt, U.S., Maier, H.A., frost, G.V., Raynolds, M.K., Comiso, J.C., Daanen, R.P., Drozdov, D.S., Forbes, B.C., Gubarkov, A.A., Jia, G.J., Kaarlejärvi, E., Khitun, O., Khumotov, A.V., Kuss, H.P., Leibman, M.E., Matyshak, G., Moskalenko, N.G., Orekhov, P., Pinzon, J.E., Romanovsky, V.E., Tucker, C.J., Ukraientseva, N.K., Yu, Q. 2010. Greening of the Arctic: A planet-to-plant analysis of tundra vegetation change. State of the Arctic Meeting. Miami, Fl 16-19 March. PDF
131. Walker, D.A., Epstein, H.E., Maier, H.A., Frost, G.V., Raynolds, M.K., Bhatt, U.S., Liebman, M.O., Moskalenko, N., Forbes, B.C., Romanovsky, V.E., Comiso, J.C., Daanen, R., Drozdov, D.S., Kaarlejärvi, E., Khitun, O., Khomutov, A.V., Kuss, P., Matyshak, G., Orechov, P., Pinzon, J.E., Tucker, C.J. 2010. The Yamal Transect: Vegetation Analysis and Mapping (a plant to planet approach). Second Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
132. Walker, D.A., Raynolds, M.K., Kofinas, G.P. 2010. Arctic LTER: Map Analysis. MALS Workshop. Fairbanks, AK October 8-9. PDF
133. Yu, Q., Epstein, H.E., Walker, D.A. 2010. Controls on arctic tundra vegetation dynamics on the Yamal Peninsula, Russia - an integrative study using ArcVeg and multi-temporal Landsat imagery. Second Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland 8-10 March. PDF
134. Yu, Q., Epstein, H.E., Walker, D.A. 2010. Land surface dynamics on the Yamal Peninsula based on multi-temporal imagery. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD April 20-22.
135. Epstein, H.E., Walker, D.A., Raynolds, M.K., Kelley, A.M., Jia, G.J., Ping, C.L., Michaelson, G.J., Leibman, M.O., Kaarlejärvi, E., Khomutov, A.V., Kuss, H.P., Moskalenko, N.G., Orechov, P., Matyshak, G., Forbes, B.C. 2010. Vegetation biomass, leaf area index, and NDVI patterns and relationships along two latitudinal transects in arctic tundra. Second Yamal Land-Cover Land-Use Change Workshop. Rovaniemi, Finland March 08-10. PDF
136. Walker, D.A., Epstein, H.E., Maier, H.A., Frost, G.V., Raynolds, M.K., Bhatt, U.S., Comiso, J.C., Daanen, R.P., Drozdov, D.S., Forbes, B.C., Gubarkov, A.A., Jia, G.J., Kaarlejärvi, E., Khitun, O., Khomutov, A.V., Kuss, P., Leibman, M.O., Matyshak, G., Moskalenko, N.G., Orekhov, P., Pinzon, J.E., Romanovsky, V.E., Tucker, C.J., Ukraintseva, N.G., Yu, Q. 2010. The Yamal LCLUC Study: Vegetation analysis and mapping along a 900-km Arctic transect. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 20-22 April. PDF
137. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Jia, G.J., Gens, R. 2009. Greening of Arctic tundra is linked to warming summer land temperatures and sea-ice declines. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 31 March - 2 April. PDF
138. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C., Epstein, H.E., Rudiger, G. 2009. Panarctic linkages between greening of Arctic tundra, sea ice decline, and summer land temperatures. NEESPI Workshop CITIES-2009. Krasnoyarsk, Russia July 14. PDF
139. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Steele, M., Epstein, H.E., Jia, G.J., Comiso, J.C., Pinzon, J.E., Tucker, C.J. 2009. Seasonality of the air-sea-ice-land environment of Arctic tundra in Northern Eurasia and North America. Department of Atmospheric Sciences, Informal Seminar. Fairbanks, AK Nov. 18.
140. Epstein, H.E., Walker, D.A., Karlejaärvi, E., Kuss, P., Moskalenko, N.G., Orekhov, P.T., Gubarkov, A.A., Khomutov, A.V., Liebman, M.O., Matyshak, G.V. 2009. Biomass-NDVI-LAI patterns and relationships on the Yamal Peninsula, Russia. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 31 Mar-2 Apr. PDF
141. Jia, G.J., Epstein, H.E., Walker, D.A., Hu, Y., Wang, H. 2009. Decadal changes of phenological patterns over Arctic tundra biome. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 31 March-2 April. PDF
142. Khomutov, A.V., Leibman, M.O., Moskalenko, N.G., Epstein, H.E., Walker, D.A. 2009. Numerical characteristics of vegetation and their influence on active layer depth. International Workshop on the results of IPY. Sochi, Krasnodar Krai, Russia 28 September - 1 October.
143. Raynolds, M.K., Walker, D.A., Verbyla, D., Huetmann, F. 2009. Modeling the distribution of circumpolar arctic vegetation. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, Maryland 31 March-2 April. PDF
144. Walker, D.A. 2009. Arctic land is greening, says scientist. Earth & Sky Radio Series. PDF
145. Walker, D.A. 2009. The integrated mapping approach used in mapping the Arctic tundra biome. North American CBVM Workshop. Great Lakes Forestry Centre, Sault Ste Marie, Ontario, Canada December 1-2.
146. Walker, D.A., Leibman, M.O., Epstein, H.E., Forbes, B.C., Bhatt, U.S., Raynolds, M.K., Comiso, J.C., Gubarkov, A.A., Khomutov, A.V., Jia, G.J., Kaarlejärvi, E., Kaplan, J.O., Kumpula, T., Kuss, P., Matyshak, G., Moskalenko, N.G., Orekhov, P., Ukraientseva, N.K., Yu, Q. 2009. Vegetation greenness on the Yamal Peninsula, Russia: Disturbance-climate-change interactions. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 31 March-2 April. PDF
147. Yu, Q., Epstein, H.E., Walker, D.A. 2009. Simulating soil organic nitrogen and grazing effects on arctic vegetation dynamics on the Yamal Peninsula, Russia. Environmental Research Letters. 4(4). PDF. doi: 10.1088/1748-9326/4/4/045027.
148. Yu, Q., Epstein, H.E., Walker, D.A. 2009. Simulating soil organic nitrogen and grazing effects on arctic tundra vegetation dynamics on the Yamal Peninsula, Russia. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD 31 March-2 April. PDF
149. Yu, Q., Epstein, H.E., Walker, D.A. 2009. Evaluating Environmental Controls on Arctic Tundra Vegetation Dynamics on Yamal Peninsula, Russia. EnviroDay. University of Virginia, VA January 12. PDF
150. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C. 2008. Circumpolar and regional analysis of the relationship between sea-ice variability, summer land-surface temperatures, Arctic tundra greenness and large-scale climate drivers. NASA Carbon Cycle and Ecosystems Joint Science Workshop. Adelphi, MD 28 April - 2 May . PDF
151. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C. 2008. Pan-Arctic climate dynamics in relationship to sea ice, land-surface temperatures and NDVI: focus Yamal region & comparison with North America. Yamal Land-Cover Land-Use Change Workshop. Moscow, Russia January 28-30. PDF
152. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C. 2008. Application of Space-based Technologies and Models to Address Land-cover/Land-use Change Problems on the Yamal Peninsula, Russia: Circumpolar and regional analysis of the relationship between sea-ice variability, summer land-surface temperatures, Arctic t. NASA Carbon Cycle and Ecosystems Joint Science Workshop. Adelphi, MD April 28 - May 2. PDF - NASA CCE website
153. Epstein, H., Bhatt, U., Steele, M., Walker, D.A. 2008. Collaborative Research: Seasonality of Circumpolar Tundra: Ocean and atmosphere controls and effects on energy and carbon budgets. Proposal to the National Science Foundation. PDF
154. Epstein, H.E., Walker, D.A., Kuss, P., Karlejaärvi, E. 2008. (1)LAI, NDVI, and vegetation biomass for Low Arctic sites in the Yamal region of Russia (2)An overview of modeling vegetation and ecosytem dynamics in arctic tundra. Yamal Land-Cover Land-Use Change Workshop Moscow, Russia 28-30 January.
155. Epstein, H.E., Walker, D.A., Kuss, P., Karlejaärvi, E., Matyshak, G.V. 2008. Ecosystem Properties along a Latitudinal Gradient of the Yamal Region, Russia. NASA Carbon Cycle and Ecosystems Joint Science Workshop, Adelphi, MD, April 28-May2, 2008. PDF - Abstract
156. Jia, G.J., Wang, H., Epstein, H.E., Walker, D.A. 2008. Greening of Arctic: Knowledge and Uncertainties. Yamal Land-Cover Land-Use Change Workshop. Moscow, Russia January 28-30. PDF
157. Kuss, P., Karlejaärvi, E., Moskalenko, N., Epsein, H., Walker, D. 2008. Plant communities at Nadym, Laborovaya, and Vaskiny Dachi. Yamal Land-Cover Land-Use Change Workshop. Moscow, Russia 28-30 January. PDF
158. Raynolds, M.K., D.A. Walker, and J.C. Comiso 2008. Spatial patterns of land surface temperature and NDVI and their relation to vegetation distribution on the Yamal Peninsula. Yamal Land-Cover Land-Use Change Workshop Moscow, Russia January 28-30. PDF
159. Raynolds, M.K., Walker, D.A., Comiso, J.C. 2008. Spatial Patterns of Land Surface Temperature and NDVI on the Yamal Peninsula, Russia. NASA Carbon Cycle and Ecosystems Joint Science Workshop. Adelphi, MD April 28 - May 2. PDF
160. Raynolds, M.K., Walker, D.A., Comiso, J.C. 2008. Circumpolar AVHRR Surface Temperature and its Relationship to Bioclimate Zones and NDVI. Komarov Botanical Institute. St. Petersburg, Russia February 5.
161. *Walker, D.A. 2008. Arctic sea ice, Arctic vegetation change and lessons from 2007. Arctic Observation Integration Workshop. Palisades, NY March 17-20. PDF
162. Walker, D.A. 2008. Remote very High Arctic Terrestrial Observatory Stations: A reconnaissance expedition to Isachsen, Mould Bay, and Green Cabin. Proposal to National Science Foundation, ARC-AON. PDF
163. Walker, D.A. 2008. North American Arctic Transect. 20th Annual Meeting and Arctic Forum. Washington, D.C. May 13-15 . PDF
164. Walker, D.A. 2008. Overview of the Yamal LCLUC Project and Objectives of the Meeting. Yamal Land-Cover Land-Use Change Workshop. Moscow, Russia January 28-30. PDF
165. Walker, D.A. 2008. Greening of the Arctic: An IPY Initiative. Does the loss of sea ice affect the tundra and those who depend on it?. Institute of Arctic Biology Seminar. Fairbanks, AK November 21. PDF
166. Walker, D.A. 2008. Biocomplexity of Arctic Patterned Ground: A tale of cracking, heaving, and smothering!. Dynamics of Complex Systems: Common Threads Workshop. Fairbanks, AK 6 August. PDF
167. Walker, D.A. 2008. Application of space-based technologies and models to address land-cover/land-use change problems on the Yamal Peninsula, Russia. NASA Carbon Cycle and Ecosystems Joint Science Workshop. Adelphi, MD April 28 - May 2. PDF
168. Walker, D.A. 2008. Monitoring spatial and temporal changes in Arctic vegetation. CBMP Partnership Workshop. Washington, D.C. March 6-7. PDF
169. Walker, D.A., Bhatt, U., Romanovsky, V., Kofinas, G. 2008. Adaptation to rapid land-use and climate changes on the Yamal Peninsula, Russia: Remote sensing and models for analyzing cumulative effects. Proposal to the National Aeronautics and Space Administration. PDF
170. Walker, D.A., Bhatt, U.S., Romanovsky, V.E., Kofinas, G.P., Raynolds, M.K., Epstein, H.E., Yu, Q., Forbes, B.C., Stammler, F., Karlejaärvi, E., Leibman, M., Moskalenko, N., Gubarkov, A., Khomutov, A., Kumpula, T., Comiso, J.C., Kuss, J.P., Jia, G.J., Kaplan, J.O., Matyshak, G. 2008. Cumulative effects of resource development, reindeer herding, and climate change on the Yamal Peninsula. NASA Carbon Cycle and Ecosystems Joint Science Workshop. Adelphi, MD 28 April - 2 May.
171. Walker, D.A., Epstein, H.E., Karlejaärvi, E., Kuss, J.P., Leibman, M.O., Matyshak, G.V., Moskalenko, N.G., Romanovsky, V.E. 2008. Application of space-based technologies and models to address land-cover/land-use change problems on the Yamal Peninsula, Russia: 2007 field studies along the bioclimate gradient. NASA Carbon Cycle and Ecosystems Joint Science Workshop, Adelphi, MD, April 28-May 2, 2008. PDF
172. Walker, D.A., Epstein, H.E., Karlejaärvi, E., Kuss, P., Leibman, M.O., Moskalenko, N.G., Matyshak, G.V. 2008. 2007 Expedition to Yamal Peninsula Region, Russia. Yamal Land-Cover Land-Use Change Workshop Moscow, Russia January 28-30. PDF
173. Walker, D.A., Forbes, B.C., Stammler, F., Kumpula, T., Gubarkov, A., Karlejäarvi, E., Bhat, t.U., Raynolds, M., Romanovsky, V., Kuss, P., Leibman, M., Moskalenko, N., Khomutov, A., Epstein, H., Yu, Q., Jia, J., Comiso, J., Kaplan, J. 2008. Cumulative impacts analysis on the Yamal Peninsula, Russia: A blueprint for a comparative study in Northern Alaska?. 20th Annual Meeting and Arctic Forum. Washington, D.C. 13-15 May . PDF
174. Walker, D.A., Murray, M. 2008. Linked Response to Rapid Climate Change and Land-Use Change in the Arctic. Human Dimensions of the Arctic. San Francisco, CA December 18. PDF
175. Bhatt, U.S., Walker, D.A., Raynolds, M.K., Comiso, J.C. 2007. Influence of Regional Sea Ice Variability on Arctic Tundra. Seventh International Conference on Global Change: Connection to the Arctic. Fairbanks, Alaska, February 19-20, 2007. 76-78. PDF - Online Proceedings
176. Ping, C.L., Kimble, J., Michaelson, G.J., Walker, D.A. 2007. Cryogenesis and Carbon Stores in Arctic Tundra Soils, Alaska. Arctic Science Conference. Anchorage, AK September 24-26.
177. Walker, D.A. 2007. The Circumpolar Arctic Vegetation Map and the Arctic Geobotanical Atlas. Fourth International CAFF Flora Group Workshop. Faroe Islands, Denmark May 15-17 .
178. Walker, D.A. 2007. A Circum-Boreal Vegetation Map Inititiative: The U.S. Perspective. Fourth International CAFF Flora Group Workshop. Faroe Islands, Denmark May 15-17.
179. Walker, D.A. 2007. Interactions of climate, sea-ice, land-temperatures carbon, and humans in the Arctic: an overview. Land Cover, Land Use Change Spring Science Team Meeting. Bethesda, MD April 4 - 6. PDF
180. Walker, D.A. 2007. A Hierarchic Geobotanical Atlas. 41st Alaska Surveying and Mapping Conference. Fairbanks, AK 19-23 March. PDF
181. Walker, D.A., Maier, H.A., Barbour, E.M., Balser, A.W., Grimes, J.P., Heinrichs, T.A., Nolan, M., Prokein, P., Pylant, C.L., Raynolds, M.K., Rogan, L.M., Sharpton, V.L., Stahlke, D.L., Vockeroth, S.G. 2007. Legacy IPY Hierarchic GIS Database for the Arctic Observatory at Toolik Lake. 41st Alaska Surveying and Mapping Conference. Westmark Hotel, Fairbanks, AK 19-23 March. PDF
182. Barbour, E.M., Walker, D.A., Maier, H.A., Balser, A.W., Grimes, J.P., Heinrichs, T.A., Nolan, M., Prokein, P., Pylant, C.L., Raynolds, M.K., Rogan, L.M., Sharpton, V.L., Stahlke, D.L., Vockeroth, S.G. 2006. Arctic Geobotanical Atlas. Arctic Science Conference, Arctic AAAS Division Meeting. Fairbanks, AK October 2-4. PDF
183. Epstein, H.E., Walker, D.A., Jia, G.J., Kelley, A.M., Raynolds, M.K. 2006. Climate, plant biomass, and NDVI relationships along the full arctic bioclimate gradient. Arctic Forum. Washington, DC May 12.
184. Maier, H.A., Walker, D.A., Barbour, E.M., Balser, A.W., Grimes, J.P., Heinrichs, T.A., Nolan, M., Prokein, P., Pylant, C.L., Raynolds, M.K., Rogan, L.M., Sharpton, V.L., Stahlke, D.L., Vockeroth, S.G. 2006. Arctic Geobotanical Atlas. 26th Annual ESRI International User Conference. San Diego, CA August 7-12. PDF
185. Nickolsky, D.J., Romanovsky, V.E., Tipenko, G.S., Walker, D.A., Daanen, R.P., Overduin, P.P. 2006. Modeling reaction of non-sorted circles to changes in climate and vegetation cover. Arctic Science Conference, Arctic AAAS Division Meeting. Fairbanks, AK October 2-4. PDF
186. Raynolds, M.K., Comiso, J.C., Walker, D.A. 2006. Comparison of arctic tundra bioclimate subzones and AVHRR surface temperature, and relationship to NDVI. 9th Bi-Annual Circumpolar Remote Sensing Symposium. Seward, Alaska May 16-19. PDF
187. Raynolds, M.K., Walker, D.A. 2006. Satellite land surface temperatures and tundra vegetation. Arctic Science Conference, Arctic AAAS Division Meeting. Fairbanks, AK October 2-4.
188. Walker, D.A. 2006. IPY: Greening of the Arctic (GOA): North American Arctic Transect (NAAT). Proposal to National Science Foundation, IPY (declined). PDF
189. Walker, D.A. 2006. Application of space-based technologies and models to address landcover/land-use change problems on the Yamal Peninsula, Russia. NEESPI-CLAC meeting. Fairbanks, AK April 6-8.
190. Walker, D.A. 2006. Greening of the Arctic: an IPY initiative. Arctic Science Conference, Arctic AAAS Division Meeting. Fairbanks, AK October 2-4.
191. Walker, D.A. 2006. Complexity in natural biological ecosystems: Interactions of physical and biological processes in the formation of small patterned-ground features across the Arctic climate gradient. Dynamics of Complex Systems: Common Threads Workshop. Fairbanks, AK July 5-7. PDF
192. Walker, D.A., Bhatt, U.S., Comiso, J.C., Epstein, H.E., Forbes, B.C., Jia, J., Kaplan, J.O., Kofinas, G.P., Leibman, M.O., Maier, H.A., Moskalenko, N.G., Raynolds, M.K., Romanovsky, V.E. 2006. Application of Space-based Technologies and Models to Address Land-cover/Land-use Change Problems on the Yamal Peninsula, Russia. Proposal to the National Aeronautics and Space Administration. PDF
193. Walker, D.A., Bhatt, U.S., Comiso, J.C., Epstein, H.E., Forbes, B.C., Jia, J., Kaplan, J.O., Kofinas, G.P., Leibman, M.O., Maier, H.A., Moskalenko, N.G., Raynolds, M.K., Romanovsky, V.E. 2006. Application of Space-based Technologies and Models to Address Land-cover/Land-use Change Problems on the Yamal Peninsula, Russia. Land Cover, Land Use Change Meeting. College Park, MD October 10-12.
194. Walker, D.A., Daanen, R., Kade, A.N., Michaelson, G.J., Nicolsky, D.J., Peterson, R., Ping, C.L., Munger, C.A., Raynolds, M.K., Romanovsky, V.E., Vonlanthen, C.M., Epstein, H.E., Kelley, A.M., Gould, W.A., Gonzalez, G., Krantz, W.B., Tarnocai, C.T. 2006. Interactions of physical and biological processes in the formation of small patterned-ground features across the arctic climate gradient. Arctic Science Conference, Arctic AAAS Division Meeting. Fairbanks, AK October 2-4.
195. Walker, D.A., Epstein, H.E., Jia, G.J., Bhatt, U.S., Romanovsky, V.E., Comiso, J.C., Kaplan, J.O., Markon, C.J., Leibman, M.E., Moskalenko, N.G., Forbes, B.C., Kofinas, G.P., Tarnocai, C., Ping, C.L., Michaelson, G., Gould, W.A., Maier, H.A., Barbour, E.M., Raynolds, M.K., Munger, C.A., Nolan, M., Prokein, P., Heinrichs, T.A., Grimes, J.P., Sharpton, V.L., Balser, A.W., Kuss, H.P. 2006. Greening of the Arctic: An IPY Initiative. Arctic Forum. Washington, D.C. 25-26 May. PDF
196. Kade, A., D.A. Walker, Romanovsky, V.E. 2005. The N-factor along a climate gradient in patterned-ground ecosystems. 2nd European Conference on Permafrost. Potsdam, Germany June 12 - 16.
197. Ping, C.-L., G.J. Michaelson, Y. Shur, C. Tarnocai, Walker, D.A. 2005. Nonsorted circles and soil formation in Arctic Canada. 2nd European Conference on Permafrost. Potsdam, Germany 12-16 June.
198. Shur, Y., Ping, C.L., Walker, D.A. 2005. Comprehensive model of frost boils and earth hummocks formation. 2nd European Conference on Permafrost. Potsdam, Germany 12-16 June. PDF
199. Tarnocai, C., Walker, D. 2005. Turf hummocks along a climatic gradient in Arctic Canada: characteristics and development. 2nd European Conference on Permafrost. Potsdam, Germany June 12-16.
200. Walker, D.A. 2005. Greening of the Arctic: Synthesis and models to examine pan-Arctic vegetation change: climate, sea-ice, and terrain linkages. Proposal to the National Science Foundation. PDF
201. *Walker, D.A. 2005. Biocomplexity of frost-heave features. University of Alaska Anchorage Complex Systems Group. Anchorage, Alaska March 21.
202. Walker, D.A. 2005. Application of space-based technologies and models to address land-cover/land-use change problems on the Yamal Peninsula, Russia. NEESPI Briefing for IGBP Leadership. San Francisco, CA December 4. PDF
203. *Walker, D.A. 2005. Recent changes to arctic tundra vegetation. NOAA State of the Arctic Workshop. Woods Hole, MA October 24-26.
204. Walker, D.A. 2005. Polygenetic origin of small patterned-ground features. Biocomplexity of Frost Boils Modeling Workshop. Fairbanks, AK March 14-16. PDF
205. Walker, D.A. 2005. Biocomplexity of small patterned-ground features: A North American Arctic Transect. Institute of Arctic Biology Seminar. Fairbanks, AK October 28. PDF
206. Walker, D.A. 2005. Towards an Arctic Geographic Information System: A web-based plant-to-planet-scale geobotanical atlas centered on the Toolik Lake Field Station. PDF
207. Walker, D.A., Epstein, H.E., Jia, G.J., Bhatt, U.S., Romanovsky, V., Comiso, J., Kaplan, J., Markon, C.J., Leibman, M.E., Moskalenko, N.G., Forbes, B., Kofinas, G.P., Tarnocai, C.T., Ping, C.L., Maier, H.A., Nolan, M., Prokein, P., Heinrichs, T.A., Grimes, J.P., Raynolds, M.K., Munger, C.A., Sharpton, V.L., Balser, A.W. 2005. Greening of the Arctic: an IPY initiative. ICARP II. Copenhagen, Denmark November 10-12. PDF
208. Walker, D.A., Kade, A.N., Michaelson, G.J., Ping, C.L., Raynolds, M.K., Romanovsky, V.E., Epstein, H.E., Kelley, A.M., Gould, W.A., Gonzalez, G., Krantz, W.B. 2005. Biocomplexity of small periglacial patterned-ground forms: Polygenetic formation of surface forms along the Arctic bioclimate gradient. Biocomplexity in the Environment Awardees Meeting. Arlington, VA March 21 - 23.
209. *Walker, D.A., Raynolds, M.K., Maier, H.A. 2005. Circumpolar Arctic Vegetation Map: application for a plant-community-level map. Arctic Network Terrestrial Scoping Workshop. Fairbanks, AK April 26 - 28.
210. Gould, W.A., Walker, D.A., Raynolds, M.K., Daniels, F.J.A., Elvebakk, A., Matveyeva, N. 2004. Variation in plant community composition along topographic and climatic gradients in the Canadian Arctic: results of the CAVM Canadian transect. Second International Workshop on Circumpolar Vegetation Classification and Mapping. Tromsø, Norway June 2-6.
211. Kade, A., D.A. Walker, Raynolds, M.K. 2004. Classification and ordination of frost-boil ecosystems along a climate gradient in the Low Arctic, Alaska. Second International Workshop on Circumpolar Vegetation Classification and Mapping. Tromsø, Norway June 2-6.
212. Raynolds, M.K., Walker, D.A. 2004. The Circumpolar Arctic Vegetation Map: Analysis of distribution and NDVI of vegetation types. 8th Circumpolar Symposium on Remote Sensing of Polar Environments. Chamonix, France June 8 - 12.
213. Raynolds, M.K., Walker, D.A., Maier, H.A. 2004. Plant-community-level mapping of Alaska based on the Circumpolar Arctic Vegetation Map. Second International Workshop on Circumpolar Vegetation Classification and Mapping. Tromsø, Norway June 2 - 6.
214. Walker, D.A. 2004. Greening of the Arctic: A transect to monitor terrestrial change across the full Arctic bioclimate gradient. IPY Workshop. Fairbanks, AK November 29. PDF
215. Walker, D.A., Raynolds, M.K., Maier, H.A., Team, C. 2004. A Vegetation Map of the Arctic Tundra Biome (1:1,750,000 scale): Overview, methods, legend and analysis. Second International Workshop on Circumpolar Vegetation Classification and Mapping. Tromsø, Norway June 2-6.
216. Epstein, H.E., Calef, M., Jia, G.J., Chapin, F.S., III, Walker, D.A., Walker, M.D., Starfield, A. 2003. Dynamics of Vegetation and Soils in Arctic Tundra Ecosystems. Field talk. Toolik Field Station, AK June 30. PDF
217. Gould, W.A., Gonzalez, G., Walker, D.A. 2003. Biocomplexity of Frost-boil Ecosystems: Integrating science and education. Biocomplexity in the Environment Awardees Meeting. Arlington, Virginia 14 - 17 September.
218. Kade, A. and D.A. Walker 2003. Experimental Alteration of Vegetation Canopy and the Effects on Cryoturbation Regime. 54th Arctic Science Conference. Fairbanks, AK 22 - 24 September.
219. Kade, A.N., Walker, D.A. 2003. Experimental Alteration of Plant Canopy and the Effects on Cryoturbation Regime. Field talk. Toolik Field Station, AK June 30. PDF
220. Kade, A.N., Walker, D.A. 2003. Manipulation of vegetation canopy and the effects on cryoturbation regime in Alaskan Arctic tundra. 54th Arctic Science Conference. Fairbanks, AK 22-24 September. PDF
221. Michaelson, G.J., Ping, C.L., Walker, D.A. 2003. Biogeochemistry of Soils Associated with Cryptogamic Crusts on Frost Boils. Field talk. Toolik Field Station, AK June 30. PDF
222. Munger, C.A., Walker, D.A. 2003. Vegetation of the upper Kuparuk River region in relationship to glacial geology and surficial geomorphology. 54th Arctic Science Conference. Fairbanks, AK 22-24 September. PDF
223. Ping, C.L., Michaelson, G.J., Kimbel, J.M., Shur, Y.L., Walker, D.A. 2003. Morphogenesis of Soils Associated with Frost Boils. Field talk. Toolik Field Station, AK June 30. PDF
224. Raynolds, M.K., Burian, J.C., Walker, D.A., Maier, H.A. 2003. Relationship between plant biomass and arctic tundra bioclimate subzones based on the Circumpolar Arctic Vegetation Map. 54th Arctic Science Conference. Fairbanks, AK 22 - 24 September.
225. Walker, D.A. 2003. Biocomplexity of frost-boil ecosystems: 2003 Expedition to Banks Island. Institute of Arctic Biology Seminar. Fairbanks, AK 2003. PDF
226. Walker, D.A., Balser, A.W., Maier, H.A., Sharpton, V.L. 2003. Towards a Web-based Arctic Geographic Information System: A hierarchic GIS geobotanical atlas for the Toolik Lake-Kuparuk River region. SEARCH. unknown . PDF
227. Walker, D.A., Kade, A.N., Michaelson, G., Ping, C.L., Raynolds, M.K., Romanovsky, V.E., Epstein, H.E., Kelley, A.M., Gould, W.A., González, G., Krantz, W.B., Tarnocai, C.T. 2003. Biocomplexity of frost boil ecosystems: 2003 expedition to Banks Island and Prince Patrick Island, Canada. 54th Arctic Science Conference. Fairbanks, Alaska 22 - 24 September.
228. Walker, D.A., Kade, A.N., Michaelson, G.J., Ping, C.L., Raynolds, M.K., Romanovsky, V.E., Epstein, H.E., Kelley, A.M., Gould, W.A., Gonzalez, G., Krantz, W.B., Tarnocai, C.T. 2003. Biocomplexity of Frost-Boil Ecosystems: Models for self-organization across the Arctic Bioclimate Gradient. Biocomplexity in the Environment Awardees Meeting. Arlington, VA 14 - 17 September.
229. Cushing, E.E., Walker, D.A., Kade, A.N., Kelley, A.M. 2002. Differences in vegetation and thaw depths of frost boils and interboils of acidic and non-acidic tundra. 53rd Alaska Science Conference of the American Association for the Advancement of Science Arctic Division, Fairbanks, AK, September 18-21, 2002. PDF
230. Kade, A.N., Walker, D.A. 2002. Vegetation and Cryoturbation Interactions in Alaskan Arctic Tundra. 53rd Alaska Science Conference of the American Association for the Advancement of Science Arctic Division. Fairbanks, AK September 18-21. PDF
231. Kade, A.N., Walker, D.A. 2002. Experimental investigation of vegetation and cryoturbation interactions in Alaskan arctic tundra. 53rd Arctic Science Conference. Fairbanks, AK 18-21 September.
232. Raynolds, M.K., Ananjeva, G.V., Drozdov, D.S., Daniëls, F.J.A., Einarsson, E., Elvebakk, A., Gould, W.A., Katenin, A.E., Kholod, S.S., Korostelev, Y.V., Maier, H.A., Markon, C.J., Moskalenko, N., Talbot, S.S., Walker, D.A. 2002. Second Draft of the Circumpolar Arctic Vegetation Map. ARCSS All-Hands Workshop. Seattle, WA February 20.
233. Raynolds, M.K., Walker, D.A. 2002. Draft of the Circumpolar Arctic Vegetation Map. 53rd Arctic Science Conference. Fairbanks, AK September 18-21.
234. Walker, D.A. 2002. Active-layer-vegetation interactions: The Circumpolar Arctic Vegetation Map and a network of active layer monitoring sites as part of the Biocomplexity in the Environment initiative. Circumpolar Active Layer Monitoring (CALM) Workshop. Lewes, Delaware November 11 - 15.
235. Walker, D.A., Epstein, H.E., Gould, W.A., Krantz, W.B., Tipenko, G., Ping, C.L., Romanovsky, V., Walker, M.D. 2002. Biocomplexity of Frost-boil Ecosystems. Artic Forum. Washington, D. C. May 16-17. PDF
236. Walker, D.A., Epstein, H.E., Gould, W.A., Krantz, W.B., Tipenko, G., Ping, C.L., Romanovsky, V., Walker, M.D. 2002. Biocomplexity of Frost-boil Ecosystems. 53rd Arctic Science Conference. Fairbanks, AK September 18-21. PDF
237. Walker, D.A., Knudson, J.A. 2002. Biocomplexity of frost boil ecosystems. 53rd Arctic Science Conference. Fairbanks, AK September 18-21.
238. Walker, D.A., Raynolds, M.K., Maier, H.A., Murray, D.F., Markon, C.J., Talbot, S.S., Gould, W.A., Bliss, L.C., Edlund, S.A., Zoltai, S.C., Daniels, F.J.A., Wilhelm, M., Bay, C., Einarsson, E., Gundjonsson, G., Moskalenko, N.G., Ananjeva, G.V., Drozdov, D.S., Konchenko, L.A., Korostelev, Y.V., Melnikov, E., Ponomareva, O.E., Katenin, A.E., Kholod, S.S., Matveyeva, N.V., Safranova, I.N., Shelkunova, R., Yurtsev, B.A., Polezhaev, A.N., Elvebakk, A., Johansen, B.E., Trahan, N.G., Charron, T.M. 2002. Draft of the Circumpolar Arctic Vegetation Map. 53rd Alaska Science Conference of the American Association for the Advancement of Science Arctic Division. Fairbanks, AK September 18-21. PDF
239. Walker, D.A., V.E. Romanovsky, Krantz, W.B. 2002. Cryoturbation-ecosystem interactions: Field observations and experiments to validate a new model of frost-boil formation and its relevance to climate change. IARC/CIFAR PI Final Results Meeting. Boulder, CO October 20 - 22.
240. Walker, D.A., V.E. Romanovsky, W.B. Krantz, C.L. Ping, R.A. Peterson, M.K. Raynolds, H.E. Epstein, G.J. Jia, Wirth, D.C. 2002. Biocomplexity of frost boil ecosystems on the Arctic Slope, Alaska. 14th Annual Meeting and Arctic Forum. Arlington, VA May 16 - 17.
241. Knudson, J.A., Walker, D.A., Epstein, H.E., Jia, G.J., Raynolds, M.K., Copass, C.D., Edwards, E.J., Hollingsworth, J., Kiesz, L., Moody, A., Wirth, D. 2002. Synthesis of the Effects of the Climate Gradient and Substrate on Vegetation in the Alaskan Arctic at the ATLAS Sites: 1998-2001. ARCSS All-Hands Workshop. Seattle, WA February 20. PDF
242. Gould, W.A., Raynolds, M.K., Walker, D.A. 2001. Vegetation Characteristics Derived from an Integrated Vegetation Complex Map for the Canadian Arctic. Arctic GIS Workshop. Seattle, WA, 22-24 January. - Abstract
243. Gould, W.A., Raynolds, M.K., Walker, D.A., Edlund, S.A. 2001. Canadian Arctic vegetation and ecosystem properties. Fourth International Circumpolar Arctic Vegetation Mapping Workshop. Moscow, Russia April 10-13. PDF
244. Jia, G.J., Epstein, H.E., Walker, D.A., Burian, J.C., Maier, H.A., Raynolds, M.K., Riedel, S.M. 2001. Patterns of NDVI in Arctic Tundra from Local to Circumpolar Scales. LAII All Hands Meeting. Salt Lake City, UT 14-17 November. PDF
245. Knudson, J.A., Hollingsworth, J., Maier, H.A., Raynolds, M.K., Walker, D.A. 2001. A framework for a web-based GIS for a circumpolar arctic geobotanical atlas. Arctic GIS Workshop. Seattle, WA 22-24 Jan.
246. Raynolds, M.K., Ananjeva, G.V., Drozdov, D.S., Daniels, F.J.A., Einarsson, E., Elvebakk, A., Gould, W.A., Katenin, A.E., Kholod, S.S., Korostelev, Y.V., Maier, H.A., Markon, C.J., Moskalenko, N.G., Talbot, S.S., Walker, D.A., Wilhelm, M. 2001. First draft of the Circumpolar Arctic Vegetation Map. LAII All Hands Meeting. Salt Lake City, UT 14-17 November .
247. Raynolds, M.K., Walker, D.A., Gould, W.A., Markon, C.J. 2001. Synthesis of Alaska and Canada. Fourth International Circumpolar Arctic Vegetation Mapping Workshop. Moscow, Russia April 10-13. PDF
248. Riedel, S.M., Epstein, H.E. & Walker, D.A. 2001. Biotic controls over spectral indices of tundra vegetation and implications for regional scaling. PDF
249. Walker, D.A. 2001. Circumpolar Arctic Vegetation Map: Plan for Synthesis. unknown. unknown . PDF
250. Walker, D.A. 2001. Welcome, history, progress, and future of the CAVM. Fourth International Circumpolar Arctic Vegetation Mapping Workshop. Moscow, Russia April 10-13. PDF
251. *George, S., Hay, B., Knudson, J., Maier, H.A., Nance, K., Raynolds, M.K., Walker, D.A. 2000. The University of Alaska Fairbanks: A member of an Arctic GIS community. Arctic GIS Workshop. Seattle, WA January 22 - 24.
252. Gould, W.A., D.A. Walker, Raynolds, M.K. 2000. Canadian transect and mapping for the Circumpolar Arctic Vegetation Map. ARCSS LAII Science Workshop. Seattle, WA February 23 - 26. PDF
253. Gould, W.A., Raynolds, M.K., Walker, D.A., Maier, H.A., Edlund, S.A., Zoltai, S.C. 2000. Canadian arctic vegetation: An integrated vegetation complex map for the Circumpolar Arctic Vegetation Mapping project. 6th Circumpolar Symposium on Remote Sensing of Polar Environments. Yellowknife, NWT, Canada 12-14 May.
254. Jia, G.J., Epstein, H.E., Walker, D.A. 2000. Spatial and intraseasonal characteristics of AVHRR-NDVI for the arctic tundra in northern Alaska. ARCSS LAII Science Workshop. Seattle, WA 23-26 February.
255. Moody, A., Edwards, E.J., Walker, D.A., Epstein, H.E., Jia, G.J., Ping, C.L., Michaelson, G.J., Hinzman, L.D. 2000. A western Alaska transect to examine interactions of climate, substrate, vegetation, and spectral reflectance: ATLAS grids at Barrow, Atqasuk, Oumalik, and Ivotuk, Alaska, 1999. ARCSS LAII Science Workshop. Seattle, WA 23-26 February.
256. Muller, S.V., D.A. Walker, Moody., A. 2000. Accuracy assessment of a MSS-derived landcover map of Northern Alaska. ARCSS LAII Science Workshop. Seattle, WA February 23 - 26.
257. Riedel, S.M., Epstein, H.E., Walker, D.A., Richardson, D.L., Calef, M.P. 2000. Seasonal variations in NDVI, LAI, and biomass on four tundra vegetation types at Ivotuk, Alaska. ARCSS LAII Science Workshop. Seattle, WA February 23 - 26. PDF
258. Walker, D.A., Gould, W.A., Maier, H.A., Raynolds, M.K., Board., C.E. 2000. An AVHRR-image-based Circumpolar Arctic Vegetation Map: A hierarchical approach using image intepretation and integrated mapping methods. ARCSS LAII Science Workshop. Seattle, WA February 23 - 26. PDF
259. Walker, D.A., Gould, W.A., Maier, H.A., Raynolds, M.K., Muller, S.V. 2000. The Circumpolar Arctic Vegetation Map: Environmental controls, AVHRR-derived base maps, and integrated mapping procedures. 6th Circumpolar Symposium on Remote Sensing of Polar Environments. Yellowknife, NWT, Canada 12-14 May.
260. Walker, D.A., V.E. Romanovsky, W.B. Krantz, al., e. 2000. Cryoturbation-ecosystem interactions: project overview and first field season results. IARC/CIFAR Principal Investigators Meeting. Fairbanks, AK October 23 - 25.
261. Edwards, E.J., Moody, A., Walker, D.A. 2000. A western Alaskan transect to examine interactions of climate, substrate, vegetation, and spectral reflectance: ATLAS grids and transects, 1998-1999. NEAML Data Report. . 44 pp. + appendices.
262. Walker, D.A., Anderson, J.A., Lillie, A.C. 1999. A western Alaska transect to examine interactions of climate, substrate, vegetation, and spectral reflectance: ATLAS grids at Barrow, Atqasuk, and Ivotuk, Alaska, 1998. ARCSS LAII Science Workshop. Seattle, WA March 11-13. PDF
263. Walker, D.A., J.G. Bockheim, F.S. Chapin, W. Eugster, F.E. Nelson, Ping, C.L. 1998. Calcium-rich tundra and its importance to wildlife: Past, present, and future. 49th Annual Arctic Science Conference. Fairbanks, AK October 25 - 28.
264. Walker, D.A., Walker, M.D., Welker, J.M., Arft, A.M., Bardsley, T., Brooks, P.D., Fahnestock, J.T., Jones, M.H., Losleben, M., Parsons, A.N., Seastedt, T.R., Turner, P.L. 1998. Long-term experimental manipulation of winter snow regime and summer temperature in arctic and alpine tundra: An integrated ecosytem approach. International Conference on Snow Hydrology: The integration of physical, chemical, and biological systems. Brownsville, VT 6-9 October.
265. Gould, W.A., Walker, M.D., Walker, D.A., Edmands, T., Dornfield, M.A., Auerbach, N.A., Nettleton, T.K., Muller, S.V. 1997. Decade-scale changes in vegetation in the Brooks Range, Southern Alaska Foothills, Alaska. ARCSS LAII Science Workshop. Seattle, WA 27-29 March.
266. Muller, S.V., D.A. Walker, N.A. Auerbach, J. Bockheim, S. Guyer, F. Nelson, Sherba, D. 1997. Accuracy assessment of a landcover map of the Kuparuk River basin, Alaska. ARCSS-LAII Science Workshop. Seattle, WA March 27 - 29.
267. Walker, D.A. 1997. A Circumpolar Arctic Vegetation Map: Statement of purpose, plan for action and an early application to Northern Alaska. 40th International Association for Vegetation Science. Ceske Budejowice, Czech Republic 18-23 August.
268. *Walker, D.A. 1997. Moist nonacidic tundra: possible causes and significance to Beringian paleoenvironments. Beringian Paleoenvironments Workshop. Florissant, CO September 20 - 23.
269. *Walker, D.A. 1997. Climatic, topographic, and substrate controls over distribution of arctic vegetation. Extrapolation of Arctic and Boreal Processes that Feedback to Climate Workshop. Santa Barbara, CA April 6 - 9.
270. Walker, D.A. 1997. Mapping of northern Alaska: methodology, legend, results, problems. CAVM-North American Workshop. Anchorage, AK January 14 - 16.
271. Walker, D.A., Auerbach, J.G., Bockheim, F.S., Chapin III, W. Eugster, J. McFadden, G.J. Michaelson, F.E. Nelson, C.L. Ping, W.S. Reeburg, S. Regli, Shiklomanov., N.I. 1997. Moist nonacidic tundra: relevance to arctic land-atmosphere fluxes, wildlife, and human dimensions of arctic systems. ARCSS-LAII Science Workshop. Seattle, WA March 27 - 29.
272. Walker, D.A., M. D. Walker, A.M. Arft, J.M. Welker, M.H. Jones, J.T. Fahnstock, P.D. Brooks, T.R. Seastedt, A.N. Parsons, Turner, T.L. 1997. Long-term snow-fence experiments to examine effects of altered climate in arctic and alpine tundra. Western Snow Conference and Eastern Snow Conference. Banff, Alberta May 4 - 8.
273. Walker, D.A., N.A. Auerbach, Kohn, M.J. 1997. A circumpolar arctic vegetation map: statement of purpose, plan for international collaboration, and a prototype map for northern Alaska. ARCSS-LAII Science Workshop. Seattle, WA March 27 - 29.
274. Auerbach, N.A., Walker, D.A. 1996. Modern Vegetation Patterns at Barrow and Barter Island: Relevance to Disturbance and Recovery, and Paleoenvironmental Studies. 26th Annual Arctic Workshop. Boulder, CO March 14 - 16.
275. Brown, J., F.E. Nelson, D.A. Walker, Marion., G.M. 1996. A Circumpolar Active Layer Monitoring (CALM) Program. Arctic System Science Flux Study Workshop. Seattle, WA February 22 - 24.
276. Walker, D.A., and S.S. Talbot 1996. Progress toward circumpolar arctic vegetation mapping. Alaska Surveying and Mapping Conference. Anchorage, Alaska February 5 - 9.
277. Walker, D.A., Auerbach, N.A., Lestak, L.R., Muller, S.V., Walker, M.D. 1996. A hierarchic GIS for studies of process, pattern, and scale in arctic ecosystems: the Arctic System Science Flux Study, Kuparuk River Basin, Alaska. ESRI ARC/INFO Users' Conference. Palm Springs, CA May 20-24.
278. Walker, D.A., M. D. Walker, N.A. Auerbach, L.R. Lestak, Muller., S. 1996. A Landsat-derived landcover map of the Kuparuk River Basin, Alaska: a component of hierarchic GIS for the study of arctic land-atmosphere interactions. Arctic System Science Flux Study Workshop. Seattle, WA February 22 - 24.
279. Walker, D.A., Walker, M.D., Auerbach, N.A., Lestak, L.R., Muller, S.V. 1996. A Hierarchic GIS for Studies of Process, Pattern and Scale for the Kuparuk River Basin: a contribution to the Arctic System Science (ARCSS) Flux Study. 26th Annual Arctic Workshop. Boulder, CO 14-16 March.
280. Brown, J., F.E. Nelson, Walker, D.A. 1995. Circumarctic active layer monitoring (CALM): an international contribution to ITEX. 6th International Tundra Experiment (ITEX) Workshop. Ottawa, Canada April 7 - 11.
281. *Walker, D.A. 1995. A review of disturbance and recovery of Arctic Alaska vegetation related to oil-field development. Disturbance and Recovery of Arctic Terrestrial Ecosystems workshop. Rovaniemi, Finland September 24 - 30.
282. Walker, D.A., M. D. Walker, N.A. Auerbach, L.R. Lestak, B.E. Lewis, D.S. Schimel, Shippert, M.M. 1995. A hierarchic GIS for studies of process, pattern and scale in arctic ecosytems. ARCSS-LAII Science Workshop. Orcas Island, Washington March 1 - 5.
283. Walker, D.A., M. Walker, N. Auerbach, L. Lestak, B. Lewis, Rose, K. 1995. A vegetation map of the upper Kuparuk River region, Alaska: a component of a hierarchic GIS for studies of arctic land-atmosphere interactions. Tenth Annual ESRI European User Conference. Palm Springs, CA May 22 - 26.
284. Shippert, M.M., Walker, D.A., Auerbach, N.A. 1994. Biomass and leaf-area index maps derived from SPOT images for the Toolik Lake and Imnavait Creek area, Alaska. Third Circumpolar Symposium on Remote Sensing of Arctic Environments. Fairbanks, AK 16-20 May.
285. Suding, P.W., Krantz, W.B., Walker, D.A., Lewis, B.E. 1994. Field Study of the Effect of Increased Snow Depth on Frost Penetration. 70th Annual Meeting of the Southwestern and Rocky Mountain Division of the American Association for the Advancement of Science. Durango, Colorado May 22 - 26.
286. Walker, D.A. 1994. Information: Toward a new arctic vegetation map: St. Petersburg workshop. Arctic and Alpine Research. 27:103-104. PDF
287. Walker, D.A., Auerbach, N.A., Lewis, B.E., Shippert, M.M. 1994. Remote sensing of acid and nonacid tundra regions in northern Alaska and relevance to arctic landscape succession. Third Circumpolar Symposium on Remote Sensing of Arctic Environments. Fairbanks, Alaska May 16-20.
288. Duguay, C.R., Walker, D.A. 1993. Environmental modeling and monitoring at the Niwot LTER site: an overview of recent research activities using GIS. Second International Conference/Workshop on Integrating Geographic Information Systems and Environmental Modeling. Breckenridge, CO, September. PDF
289. Price, E.T., Krantz, W.B., Walker, D.A. 1993. Thermal characteristics and frost penetration rate of alpine soils with diffrential snow cover. Southwestern and Rocky Mountain Division, AAAS 69th annual meeting. Albuquerque, NM May 23 - 27.
290. *Walker, D.A. 1993. Long-term research in the alpine: overview of the Long-Term Ecological Resarch (LTER) project and the International Tundra Experiment (ITEX). Wildlife Institute of India. Dehradun, India October 21.
291. *Walker, D.A. 1993. Hierarchic geographic information systems: applications to alpine research, disturbance studies, and climate change. Wildlife Institute of India. Dehradun, India October 21.
292. *Walker, D.A., W.B. Krantz, B.E. Lewis, E.T. Price, R.D. Tabler, M. D. Walker, Wessman, C.A. 1993. Multi-scale studies of snow-vegetation interactions in the alpine zone. International Workshop on Snow Ecology. Quebec City, Canada June 3 - 7.
293. Walker, D.A. 1992. Hierarchical geographic information systems for the Arctic. International workshop on classification of circumpolar arctic vegetation. Boulder, CO March 5 - 9.
294. Walker, D.A., M. D. Walker, N.A. Auerbach, Lestak, L.R. 1992. A Hierarchical GIS for modeling tundra ecosystem processes. 12th Annual ESRI User's Conference. Palm Springs, CA May 20 - 25.
295. Walker, M.D., Walker, D.A. 1992. Classification and gradient analysis of the Brooks Range Foothills, Alaska. International workshop on classification of circumpolar arctic vegetation. Boulder, CO March 5 - 9.
296. Auerbach, N.A., M. D. Walker, Walker, D.A., Randolph, S. 1991. Effects of road dust disturbance in arctic tundra. 11th Annual ESRI User's Conference. Palm Springs, CA May 20 - 25.
297. Auerbach, N.A., Walker, M.D., Walker, D.A. 1991. Road dust disturbance in arctic tundra soils and vegetation, Alaska, USA. 21st Arctic Workshop, Alaska Quaternary Center. Fairbanks, AK .
298. Auerbach, N.A., Walker, M.D., Walker, D.A. 1991. Road dust disturbance in arctic tundra soils and vegetation, Alaska, USA. 42nd Annual Arctic Science Conference. Fairbanks, AK May 14-15.
299. Walker, D.A., N.D. Lederer, L.R. Lestak, E. Binnian, Nordstrand, E.A. 1991. Prudhoe Bay Oil Field, Arco Base Camp, Geobotany and Cumulative Impacts. 11th Annual ESRI User's Conference. Palm Springs, CA May 20 - 25.
300. Walker, D.A., N.D. Lederer, Lestak, L.R. 1991. Niwot Ridge/Green Lakes Valley LTER Site. 11th Annual ESRI User's Conference. Palm Springs, CA May 20 - 25.
301. Walker, D.A., Walker, M.D. 1991. Hierarchical GIS for analyzing ecosystem processes and climate change in the Alaskan Arctic. 21st Arctic Workshop, Mesoscale Modeling. Fairbanks, AK May 16 - 18.
302. Walker, D.A., Walker, M.D., Auerbach, N.A., Lestak, L.R. 1991. A Hierarchical GIS for modeling tundra ecosystem processes. First International Conference/ Workshop on Integrating Geographic Information Systems and Environmental Modeling. Boulder, CO 15-19 September.
303. Walker, M.D., Walker, D.A. 1991. Toward a circumpolar vegetation classification system. 42nd Annual Arctic Science Conference. Fairbanks, AK May 14 - 15.
304. Auerbach, N.A., Walker, M.D., Walker, D.A., Lestak, L.R. 1990. Cumulative impact of road dust on arctic tundra: interactions among species composition, dust chemistry, and soil pH. 19th Annual Arctic Workshop. Boulder, CO March 8 - 10.
305. Walker, D.A. 1990. Loess ecosystems in northern Alaska. 75th Annual Ecological Society of America Meeting. Snowbird, UT July 29 - August 2.
306. Walker, D.A., Walker, M.D., Randolph, S.T., Lederer, N.D. 1990. Hierarchical GIS examining long-term landscape change at multiple scales in the Arctic Foothills, Alaska. 19th Annual Arctic Workshop. Boulder, CO March 8 - 10.
307. Walker, D.A., Walker, M.D., Randolph, S.T., Lederer, N.D. 1990. Hierarchical GIS examining long-term landscape change at multiple scales in the Arctic Foothills, Alaska. Faculty Symposium on Global Change. Boulder, CO 13-14 September.
308. Walker, D.A., Walker, M.D., Randolph, S.T., Lederer, N.D. 1990. Hierarchical GIS examining long-term landscape change at multiple scales in the Arctic Foothills, Alaska. International ESRI User's Conference. Palm Springs, CA 14-18 May.
309. Walker, D.A., Walker, M.D., Randolph, S.T., Lederer, N.D. 1990. Hierarchical GIS examining long-term landscape change at multiple scales in the Arctic Foothills, Alaska. Long-Term Ecological Research Program All Scientist Meeting. Estes Park, CO 26-29 September.
310. *Walker, D.A. 1989. Loess ecosystems of northern Alaska. Ecosystem Center, Marine Biological Laboratory. Woods Hole, MA May 17.
311. *Walker, D.A. 1989. A hierarchical approach to analyzing landscape change. LTER GIS training session. Boulder, CO September 23.
312. Walker, D.A. 1989. A hierarchical GIS approach to examine natural and anthropogenic disturbance in the Alaskan Arctic. Arctic Division of AAAS. Fairbanks, AK September.
313. Walker, D.A., J.C. Halfpenny, L.D. Lederer, M. D. Walker, L. Ayers, Wessman, C.A. 1989. A hierarchical GIS to examine long-term snow-biosystem interactions in the Colorado alpine. 1989 ESRI Users Conference. Palm Springs, CA May 22 - 26.
314. Walker, D.A., L.M. Ayers, N.Caine, J.C. Halfpenny, N.D. Lederer, M. D. Walker, Wessman, C.A. 1989. GIS methods for detecting long-term change in the Colorado alpine. Fourth Annual Landscape Ecology Symposium. Fort Collins, CO March 15 - 18.
315. *Walker, D.A., L.M. Ayers, N.Caine, J.C. Halfpenny, N.D. Lederer, M. D. Walker, Wessman, C.A. 1989. Cumulative impacts in northern Alaska. Sigma Xi. University of Colorado February 7.
316. Wessman, C.A., Ayers, L., Walker, D.A. 1989. Remotely sensed pattern to system process in the Front Range. Program review for the Cooperative Institute for Research in Environmental Sciences. Boulder, CO June 8.
317. Wessman, C.A., Walker, D.A., Walker, M.D. 1989. Remotely sensed pattern to process in the Front Range alpine. Fourth Annual Landscape Ecology Symposium. Fort Collins, CO 15-18 March.
318. Walker, D.A., Benson, C.S., Evans, B.M. 1988. Application of GIS to spatial analysis of terrain-snow-vegetation interactions. 17th Annual Arctic Workshop. Boulder, CO 14-16 April.
319. Walker, D.A., Lederer, N.D., Walker, M.D., Nordstrand, E.A., Binnian, E., Evans, B.M., Peterson, G.W., Benson, C.S. 1988. An R4D geographic information system. 17th Annual Arctic Workshop. Boulder, CO 14-16 April.
320. Walker, D.A., Walker, M.D., Lederer, N.D. 1988. Terrain and vegetation classification of the DOE R4D Imnavait Creek site. 17th Annual Arctic Workshop. Boulder, CO 14-16 April.
321. Walker, M.D., Walker, D.A., Acevedo, W. 1988. Comparison of community and regional ordinations in the northern Brooks Range foothills. Third Annual Landscape Ecology Symposium; Observations across Scales: Function and Management of Landscapes. Albuquerque, NM 16-19 March.
322. Walker, M.D., Walker, D.A., Acevedo, W. 1988. Vegetation and environmental interactions at two scales on the North Slope of Alaska. 17th Annual Arctic Workshop. Boulder, CO 14-16 April.
323. Evans, B.M., Walker, D.A., Benson, C., Peterson, G., Webber, P.J., Day, R.L., Nordstrand, E. 1987. Use of a multilayered digital database to determine interrelationships between landform geometry, vegetation and climate in an arctic foothills landscape. American Institute of Biological Sciences and Ecological Society of America. Columbus, OH 10-13 August.
324. Walker, M.D., Walker, D.A. 1987. Importance of landscape focal points in maintaining regional diversity: a case study of the northern Alaskan pingos. Second Annual Symposium, Regional Association, International Association for Landscape Ecology. Charlotte, NC March 9 - 11.
325. Slaughter, C.W., Johnson, L.A., Racine, C.H., Walker, D.A., Abele, G. 1986. Environmental response to off-road vehicle (ORV) use in permafrost affected landscapes. Seventh Conference of the Comité Arctique International (Restoration and Vegetation Succession in Circumpolar Lands). Rejkavik, Iceland September 7 - 13.
326. *Walker, D.A. 1986. Cumulative impacts in the wetlands of northern Alaska. NASA-Ames. Palo Alto, CA April 15.
327. *Walker, D.A. 1986. Use of GIS Technology for examining cumulative impacts in the Prudhoe Bay Oilfield. North Slope Borough. Barrow, AK August 22.
328. *Walker, D.A. 1986. Vegetation and Ecology of Northern Alaska. Denver Museum of Natural History. Denver, CO 1986.
329. Walker, D.A. 1986. An automated mapping approach for geobotanical maps of the DOE R4D research site near Toolik Lake, Alaska. 15th Annual Arctic Workshop. Boulder, CO April 24-26.
330. Walker, D.A. 1986. Roadside vegetation changes due to dust. Dalton Highway and Prudhoe Bay Spine Road, Alaska. Seventh Conference of the Comite Arctique International (Restoration and Vegetation Succession in Circumpolar Lands). Reykjavik, Iceland September 7-13.
331. Walker, M.D., Walker, D.A. 1986. Soil and vegetation succession on pingos, central arctic coastal plain, Alaska. Seventh Conference of the Comite Arctique International (Restoration and Vegetation Succession in Circumpolar Lands). Rejkavik, Iceland September 7-13.
332. Webber, P.J., Walker, D.A. 1986. Cumulative impacts and the spread of disturbance in permafrost dominated lands. Seventh Conference of the Comité Arctique International (Restoration and Vegetation Succession in Circumpolar Lands). Reykjavik, Iceland 7-13 September.
333. Walker, D.A., Walker, M.D., Webber, P.J. 1985. Vegetation analysis of the DOE/R4D research site. R4D Program Data Report.
334. Walker, D.A., Walker, M.D., Everett, K.R., Webber, P.J. 1984. The puzzling pingos of Prudhoe Bay. 13th Annual Arctic Workshop. Boulder, CO March 15-17.
335. Klinger, L.F., Walker, D.A., Webber, P.J. 1982. The effects of a gravel road on arctic coastal plain tundra. 11th Annual Arctic Workshop. Boulder, CO March 11 - 13.
336. Simmons, C.L., Walker, D.A., Webber, P.J. 1982. Sensitivity of selected plant communities to seawater spills, Prudhoe Bay, Alaska. 11th Annual Arctic Workshop. Boulder, CO March 11 - 13.
337. Walker, D.A., Acevedo, W., Webber, P.J. 1982. A LANDSAT classification and vegetation map of the northern portion of the Arctic National Wildlife Refuge, Alaska. 11th Annual Arctic Workshop. Boulder, CO March 11-13.
338. Walker, D.A., Webber, P.J., Everett, K.R., Brown, J. 1981. Geobotanical mapping of the Prudhoe Bay region, Alaska. 19th Annual Arctic Workshop. Boulder, CO 12-14 March.
339. Walker, D.A., Webber, P.J. 1979. Salix lanata ssp. richardsonii as a climatic indicator in Northern Alaska. Arctic Workshop. Boulder, CO 4-5 May.
340. Webber, P.J., Walker, D.A., Komárková, V. 1976. Large scale mapping of Alaskan tundra vegetation. 27th Alaska Science Conference. Fairbanks, AK 4-7 August.

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Other reports and maps to government agencies and consulting firms:

1. Walker, D.A. 2022. NNA Track 1: Landscape evolution and adapting to change in ice-rich permafrost systems. Annual report to the National Science Foundation. submitted 10/5/2022. PDF
2. Walker, D.A. 2021. NNA Track 1: Landscape evolution and adapting to change in ice-rich permafrost systems. Annual report to the National Science Foundation. submitted 8/19/2021 (with supporting files). PDF
3. Walker, D.A. 2021. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Final report to the National Science Foundation. submitted 11/20/2021. PDF
4. Walker, D.A. 2020. NNA Track 1: Landscape evolution and adapting to change in ice-rich permafrost systems. Annual report to the National Science Foundation. submitted 9/1/2020 (with supporting files). PDF
5. Walker, D.A. 2020. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Annual report to the National Science Foundation. submitted 8/29/2020. PDF
6. Walker, D.A. (ed.) 2019. CAFF Proceeding Series Report September 2019. Arctic Vegetation Archive and Arctic Vegetation Classification: Proceedings and abstracts from two workshops 2017 and 2019. PDF - CAFF site
7. Walker, D.A. 2019. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Annual report to the National Science Foundation. submitted 8/30/2019. PDF
8. Walker, D.A., Kanevskiy, M., Shur, Y., Raynolds, M., Peirce, J.L., Buchhorn, M., Ermokhina, K. and Druckenmiller, L.A. 2018. Snow, thaw, temperature, and permafrost borehole data from the Colleen and Airport sites, Prudhoe Bay, and photos of Quintillion fiber optic cable impacts, North Slope, Alaska. Alaska Geobotany Center Publication AGC 18-01. 74 pp. PDF. doi: 10.18739/A28K74X6T.
9. Walker, D.A. 2018. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Annual report to the National Science Foundation. submitted 7/19/2018. PDF
10. Walker, D.A. 2017. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Annual report to the National Science Foundation. submitted 8/27/2017. PDF
11. Walker, D.A., Kanevskiy, M., Shur, Y.L., Raynolds, M.K., Buchhorn, M. and Wirth, L.M. 2016. Road effects at airport study site, Prudhoe Bay, Alaska, Summer 2015. Alaska Geobotany Center Publication AGC 16-01. 74 pp. PDF. doi: 10.18739/A2VM42Z20.
12. Walker, D.A. 2016. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Annual report to the National Science Foundation. submitted 8/31/2016. PDF
13. Walker, D.A., Buchhorn, M., Kanevskiy, M., Matyshak, G.V., Raynolds, M.K., Shur, Y.L. and Wirth, L.M. 2015. Infrastructure-Thermokarst-Soil-Vegetation Interactions at Lake Colleen Site A, Prudhoe Bay, Alaska. Alaska Geobotany Center Publication AGC 15-01. 92 pp. PDF. doi: 10.18739/A2M61BQ8M.
14. Walker, D.A. 2015. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Annual report to the National Science Foundation. submitted 8/4/2015. PDF
15. Walker, D.A. (ed.) 2014. CAFF Proceedings Report 11. Alaska Arctic Vegetation Archive (AVA) Workshop, Boulder, Colorado, USA, October 14-16, 2013. Akureyri, Iceland. PDF - CAFF site
16. Walker, D.A. 2014. Cumulative Effects of Arctic Oil Development - planning and designing for sustainability. Annual report to the National Science Foundation. submitted 9/16/2014. PDF
17. Bhatt, U.S., Walker, D.A., Bieniek, P.A., Raynolds, M.K., Epstein, H.E., Comiso, J.C., Pinzon, J., Tucker, C.J. 2013. Pan-Arctic Tundra Vegetation Change and it's Links to Climate. Dpto. Biologia Vegetal II, Univ. Complutense. Madrid, Spain February 6. PDF
18. Walker, D.A., Breen, A.L., Raynolds, M.K. and Walker, M.D. (eds.). 2013. CAFF Proceedings Report #10. Arctic Vegetation Archive (AVA) Workshop, Krakow, Poland, April 14-16, 2013. Akureyri, Iceland. PDF - CAFF site
19. Frost, G.V. Epstein, H.E. Walker, D.A. Matyshak, G.V. Ermokhina, K.A. 2012. The 2011 Expedition to Kharp, Southern Yamal Peninsula Region, Russia. AGC Data Report. 83 pp. PDF
20. Walker, D.A., Maier, H.A., Barbour, E.M., Raynolds, M.K. 2011. Final Report for A web-based multi-scale Arctic Geobotanical Atlas (AGA) for the Toolik Lake Field Station, Arctic Alaska, and the Circumpolar Region. AGC Final Report. 13 pp. PDF
21. Walker, D.A., Carlson, S., Frost, G.V., Matyshak, G.V., Leibman, M.E., Orechov, P., Khomutov, A.V., Khitun, O., Zhurbenko, M.P., Afonina, O., Barbour, E.M. 2011. 2010 Expedition to Krenkel Station, Hayes Island, Franz Josef Land Russia. AGC Data Report. PDF
22. Walker, D.A., Bhatt, U.S., Epstein, H.E., Forbes, B.C., Liebman, M.O. 2010. Adaptation to rapid land-use and climate changes on the Yamal Peninsula, Russia: Remote sensing and models for analyzing cumulative effects. AGC Annual Report. 16 pp. PDF
23. Walker, D.A., Orekhov, P., Frost, G.V., Matyshak, G., Epstein, H.E., Leibman, M.O., Khitun, O., Khomotov, A., Daanen, R., Gobroski, K., Maier, H.A. 2009. The 2009 Yamal Expedition to Ostrov Belyy and Kharp, Yamal Region, Russia. AGC Data Report. 63 pp. PDF
24. Walker, D.A., Epstein, H.E., Leibman, M.E., Moskalenko, N.G., Kuss, J.P., Matyshak, G.V., Kaarlejärvi, E., Barbour, E.M. 2009. Data Report of the 2007 and 2008 Yamal Expeditions: Nadym, Laborovaya, Vaskiny Dachi, and Kharasavey. AGC Data Report. 133 pp. PDF
25. Walker, D.A. 2008. Application of Space-based Technologies and Models to Address Land-cover/Land-use Change problems on the Yamal Peninsula, Russia. AGC Annual Report. 20 pp. PDF
26. Walker, D.A. 2008. Biocomplexity associated with biogeochemical cycles in arctic frost-boil ecosystems. AGC Final Report. 77 pp. PDF
27. Walker, D.A., Epstein, H.E., Leibman, M.E., Moskalenko, N.G., Kuss, H.P., Matyshak, G.V., Kaarlejärvi, E., Forbes, B.C., Barbour, E.M. 2008. Data Report of the 2007 Yamal Expedition to Nadym, Laborovaya, and Vaskiny Dachi, Yamal Peninsula Region, Russia. AGC Data Report. PDF
28. Walker, D.A. and Epstein, H.E. 2008. Collaborative Research: Greening of the Arctic - Synthesis and models to examine pan-Arctic vegetation change: climate, sea-ice, and terrain linkages. AGC Annual Report . 16 pp. PDF
29. Walker, D.A. 2007. Application of Space-based Technologies and Models to Address Land-cover/Land-use Change problems on the Yamal Peninsula, Russia. AGC Annual Report. 15 pp. PDF
30. Walker, D.A. 2007. Collaborative Research: Greening of the Arctic - Synthesis and Models to Examine the Effects of Climate, Sea-ice, and Terrain on Circumpolar Vegetation Change. AGC Annual Report. 8 pp. PDF
31. Barreda, J.E., Knudson, J.A., Walker, D.A., Raynolds, M.K., Kade, A.N., Munger, C.A. 2006. Biocomplexity of Patterned Ground Data Report, Dalton Highway, 2001-2005. AGC Data Report. 252 pp. PDF
32. Vonlanthen, C.M., Raynolds, M.K., Munger, C.A., Kade, A.N., Walker, D.A. 2006. Biocomplexity of Patterned Ground Isachsen Expedition, July 2005. AGC Data Report. 86 pp. PDF
33. Munger, C.A., Raynolds, M.K., Kade, A.N., Walker, D.A. 2005. Biocomplexity of Patterned Ground: Mould Bay Expedition. AGC Data Report. 62 pp. PDF
34. Walker, D.A. 2005. Biocomplexity of Small Patterned-Ground Ecosystems in the Arctic. AGC Data Report. . 26. PDF
35. Raynolds, M.K., Walker, D.A., Martin, C.R. 2004. Biocomplexity of Frost-Boil Ecosystems: Snow Data Report. AGC Data Report. 32 pp. PDF
36. Munger, C.A., Raynolds, M.K., Walker, D.A. 2004. July 2003 Banks Island Expedition: Vegetation, biomass, NDVI, soil, thaw layer, invertebrates, decomposition, biogeochemistry and turf-hummock studies. AGC Data Report. 72 pp. PDF
37. NRC, Orians, G., Albert, T., Brown, G., Cameron, R., Cochran, P., Gerlach, S., Gramling, R., Gryc, G., Hite, D., Kennicutt II, M., Lachenbruch, A., Lowry, L., L., M., Pielou, C., Sedingr, J., Lindstedt-Siva, K.J., Speer, L., Walker, D.A., NAS, N.A.o.S.-., NRC, N.R.C.-. 2003. Cumulative Environmental Effects of Oil and Gas Activities on Alaska's North Slope (Summary). 28. PDF
38. NRC, Orians, G., Albert, T., Brown, G., Cameron, R., Cochran, P., Gerlach, S., Gramling, R., Gryc, G., Hite, D., Kennicutt II, M., Lachenbruch, A., Lowry, L., L., M., Pielou, C., Sedingr, J., Lindstedt-Siva, K.J., Speer, L., Walker, D.A., NAS, N.A.o.S.-., NRC, N.R.C.-. 2003. Cumulative Environmental Effects of Oil and Gas on the North Slope (Brief). 4. PDF
39. Raynolds, M.K., Walker, D.A. 2003. Banks Island July 2003 Field Report. AGC Field Report. 19 pp. PDF
40. Walker, D.A., Raynolds, M.K., Martin, C.R. 2003. Snow on the Alaska North Slope Grids, April 2003. AGC Data Report. 28 pp. PDF
41. Gould, W.A., Walker, D.A., Gonzalez, G. 2002. Biocomplexity Western Canadian Transect Reconnaisance. AGC Field Report.. 10 pp. PDF
42. Raynolds, M.K., Martin, C.R., Walker, D.A., Moody, A., Wirth, D., Thayer-Snyder, C. 2002. ATLAS Vegetation Studies: Seward Peninsula, Alaska, 2000: Vegetation, Soil, and Site Information, with Seward Vegetation Map. AGC Data Report. 125 pp. PDF
43. Walker, D.A., Raynolds, M.K., Matveyeva, N. 2002. Trip Report Russia ATLAS project. AGC Field Report. . 38. PDF
44. Walker, D.A. 2002. Field Report for Walker ATLAS and Biocomplexity projects. AGC Field Report. . 11. PDF
45. Walker, D.A., Elias, S.A., Auerbach, N.A., Short, S.K. 1997. Final Report: Alpine biodiversity, Fort Richardson, Alaska. Legacy Resource Management Program Project DAMD17-93-J-3038. . 66. PDF
46. Walker, D.A., Talbot, S.S. 1997. Toward a new circumpolar arctic vegetation map. Arctic Research of the United States. 11:80-81.
47. Walker, D.A., Auerbach, N.A., Nettleton, T.K., Gallant, A., Murphy, S.M. 1997. Happy Valley Permanent Vegetation Plots. Arctic System Science Flux Study Data Report. PDF
48. Elias, S.A., Short, S.K., Walker, D.A., Auerbach, N.A. 1996. Final Report: Historical Biodiversity at Remote Air Force Sites in Alaska. Legacy Resource Management Program Project #0742. . 123. PDF
49. Elias, S.A., Short, S.K., Walker, D.A., Auerbach, N.A. 1995. Historical biodiversity, DEW line stations, Alaska. Legacy Resource Management Program Project #0742. . 58.
50. Lewis, B.E., Walker, D.A. 1994. Vegetation survey, Fort Richardson, Alaska. Alpine Biodiversity Project, 1993.
51. Auerbach, N.A., Moskalenko, N.G., Walker, D.A. 1994. Barrow DEW Line Station, Alaska, Vegetation transect study. DOD Data Report. (Legacy Management Program). 37.
52. Walker, D.A., Barry, N. 1991. Toolik Lake permanent vegetation plots: site factors, soil physical and chemical properties, plant species cover, photographs, and soil descriptions. R4D Program Data Report. 110 pp. PDF
53. Walker, M.D., Walker, D.A., Acevedo, W. 1988. Hierarchical gradient analysis of northern Alaska landscapes: understanding vegetation-environmental interactions at macro- and mesoscales. Final report to NASA Ames Research Center under NASA Ames University Consortium Agreement NCA2-106. 104.
54. Walker, D.A., Lederer, N.D. 1987. Toposequence study: site factors, soil physical and chemical properties and plant species cover. R4D Program Data Report. 29.
55. Walker, D.A., Webber, P.J., Lederer, N.D., Walker, M.D. 1987. Terrain and vegetation of the Department of Energy R4D research site, Imnavait Creek, Alaska: I. Classification and mapping. R4D Program Data Report. . 40 pages + appendices.
56. Walker, D.A., Lederer, N.D., Walker, M.D. 1987. Permanent vegetation plots (Imnavait Creek): site factors, soil physical and chemical properties, and plant species cover. R4D Program Data Report. 43 pp. PDF
57. Walker, D.A., Binnian, E.F., Lederer, N.D., Nordstrand, E.A., Meehan, R.H., Walker, M.D., Webber, P.J. 1986. Cumulative landscape impacts in the Prudhoe Bay Oil Field 1949-1983. USFWS Final Report. PDF
58. Walker, D.A. 1985. Illustrated surface-form and vegetation legend for geobotanical mapping of the Arctic Coastal Plain of northern Alaska. 70.
59. Walker, D.A., Webber., P.J. 1985. Vegetation analysis and mapping of the R4D research site. 22.
60. Walker, M.D., Walker, D.A. 1985. The application of detrended correspondence analysis to Landsat-assisted vegetation mapping of the Sagavanirktok Quadrangle, Alaska. Phase I - Ordination of sample sites and vegetation sites. 71.
61. Webber, P.J., Walker, D.A., Komárková, V., Ebersole, J.J. 1985. Baseline monitoring methods and sensitivity analysis of Alaskan arctic tundra.
62. Walker, D.A., Lederer, N.D. 1985. Summer 1983 observations at the Prudhoe Bay experimental seawater spill sites three years after the spills. Attachment I. in P.J. Webber, D. A. Walker, V. Komárková, J.J. Ebersole (eds.) Baseline Monitoring Methods and Sensitivity Analysis of Alaskan Arctic Tundra. Cold Regions Research and Engineering Laboratory. Hanover, NH. pp. 13.
63. Walker, D.A., N.D. Lederer, Walker, M.D. 1985. Vegetation changes at permanent transects along the Dalton Highway and the Prudhoe Bay Spine Road. Attachment F. in P.J. Webber, D. A. Walker, V. Komárková, J.J. Ebersole (eds.) Baseline Monitoring Methods and Sensitivity Analysis of Alaskan Arctic Tundra. Cold Regions Research and Engineering Laboratory. Hanover, NH.
64. Walker, D.A., Walker, M.D., Lederer, N.D. 1985. 1983 Observations at the Prudhoe Bay and Franklin Bluffs hydrocarbon spill sites. Attachment H. in P.J. Webber, D. A. Walker, V. Komárková, J.J. Ebersole (eds.) Baseline Monitoring Methods and Sensitivity Analysis of Alaskan Arctic Tundra. Cold Regions Research and Engineering Laboratory. Hanover, NH. pp. 22.
65. Walker, D.A., Lederer, N.D., Walker, M.D. 1985. Observations at the Prudhoe Bay Rolligon Site seven years following the test. Attachment G. Baseline Monitoring Methods and Sensitivity Analysis of Alaskan Arctic Tundra. .
66. Walker, D.A., M. D. Walker, N.D. Lederer, Webber, P.J. 1984. The use of geobotanical maps and automated mapping techniques to study the historical changes in the Prudhoe Bay oil field, Alaska. 63.
67. Walker, D.A., Lederer, N.D. 1984. 1984 ground reference data in support of the North Slope Borough's mapping effort in northern Alaska. Final report to the Environmental Systems Research Institute. AGC Final Report. 83 pp.
68. Walker, D.A., Cate, D., Brown, J. 1984. Disturbance and recovery of Arctic Alaskan tundra terrain: a summary of recent CRREL research. CRREL Report. . 177.
69. Walker, D.A., Lederer, N.D. 1983. Vegetation aerial and ground reference data for the Noatak and Kotzebue 1:250,000-scale quadrangles. Report to Environmental Systems Research Institute. . 56.
70. Walker, D.A., Webber, P.J., Everett, K.R. 1983. 1:63,360-scale geobotanical mapping in the Arctic National Wildlife Refuge. Final report to the U.S. Army Cold Regions Research and Engineering Laboratory. 125 + 6 maps.
71. Moses, T.A., Walker, D.A. 1983. Chapter 6: Surface hydrology. in D.M. Troy (ed.) Prudhoe Bay Unit-Eileen West End Environmental Studies Program, Summer 1982. LGL Alaska Research Associates, Inc.: Fairbanks, AK. pp. 14.
72. Klinger, L.F., Walker, D.A., Walker, M.D., Webber, P.J. 1983. The effects of a gravel road on adjacent tundra vegetation. in Prudhoe Bay Waterflood Project Environmental Monitoring Program 1982. pp. 162.
73. Walker, D.A., Everett, K.R., Webber, P.J. 1983. Chapter 2: Geobotany. in D.M. Troy (eds.) Prudhoe Bay Unit-Eileen West End Environmental Studies Program, Summer 1982. LGL Research Associates, Inc. Fairbanks, AK. pp. 77.
74. Everett, K.R., Walker, D.A. 1982. Annotated and illustrated legend to 1981 SOHIO master maps. SOHIO Alaska Petroleum Co. . 98.
75. Walker, D.A., Everett, K.R., Webber, P.J., Moses, T.A. 1982. Geobotanical maps and surface hydrology (of the Eileen West End Development, Prudhoe Bay, AK). Final report to LGL Research Assoc., Inc., Alaska.
76. Webber, P.J., Klinger, L.F., Walker, D.A. 1982. The effects of a gravel road on Arctic Coastal Plain tundra (Sect. G). Final report to Woodward-Clyde Consultants, Prudhoe Bay Unit Waterflood Monitoring Program. 45 (plus appendices and maps).
77. Everett, K.R., Walker, D.A. 1982. Geobotanical reconnaissance of the SOHIO West (Kuparuk Field). Final report for Contract No. 81JL71. SOHIO Alaska Petroleum Co. . 35 plus appendices.
78. Everett, K.R., Walker, D.A. 1981. The landforms, vegetation and soils of the Sagavanirktok River delta region, Prudhoe Bay, Alaska. Final report for Contract No. 81JL71 to SOHIO Alaska Petroleum Co. SOHIO Alaska Petroleum Co. . 8.
79. Everett, K.R., Walker, D.A., Webber, P.J. 1981. Prudhoe Bay oilfield geobotanical master map. Final report for Contract No. 81JL71 to SOHIO Alaska Petroleum Co. 1:6000.
80. Simmons, C.L., Walker, D.A., Webber, P.J., Everett, K.R. 1981. Sea-water tolerances of selected tundra plants of Prudhoe Bay, Alaska. 10th Annual Arctic Workshop. Boulder, CO March 12-14.
81. Simmons, C.L., Walker, D.A., Webber, P.J., Everett, K.R. 1981. Sea-water sensitivities of selected plant communities of Prudhoe Bay, Alaska. CRREL Progress Report. . 41.
82. Walker, D.A., Webber, P.J. 1980. INSTAAR/USGS/CRREL LANDSAT mapping program. CRREL Internal Report. . 52.
83. Walker, D.A., Webber, P.J. 1980. Master maps and ecological data related to potential impacts of Project Waterflood at Prudhoe Bay, Alaska.
84. Walker, D.A. 1980. Haul road mapping. in Vegetation mapping and response to disturbances in northern Alaska. pp. 72.
85. Walker, D.A., Everett, K.R., Webber, P.J. 1980. Vegetation, soil and landform reconnaissance survey in the Kuparuk Oil Field. ARCO Oil and Gas Co. . 31.
86. Simmons, C.L., Walker, D.A., Webber, P.J. 1980. Sea water tolerances of selected vegetation of Prudhoe Bay, Alaska. CRREL Progress Report. 29 pp.
87. Walker, D.A., Webber, P.J. 1980. Geobotanical mapping of the SOHIO portion of the Prudhoe Bay Oil Field. SOHIO Alaska Petroleum Co. . 10.
88. Walker, D.A., Bowman, K., Webber, P.J. 1979. Summer 1978 observations on Alaska tundra oil spills and rolligon test sites. CRREL Report 591. 52.
89. Walker, D.A., Webber, P.J. 1979. Report of Yukon River to Prudhoe Bay vegetation mapping program. CRREL Internal Report. 186. PDF
90. Acevedo, W., Walker, D. 1979. Beechy Point, Alaska: vegetation and land cover. 1:250,000.
91. Webber, P.J., Komárková, V., Walker, D.A., Werbe, N. 1979. Geobotanical studies along a latitudinal gradient between the Yukon River and Prudhoe Bay, Alaska. CRREL Internal Repor. 366.
92. Walker, D.A., Everett, K.R., Webber, P.J. 1977. Observations at the Prudhoe Bay rolligon site one year following the test. Attachment G. in P.J. Webber, D.A. Walker, V. Komárková, J.J. Ebersole (eds.) Baseline Monitoring Methods and Sensitivity Analysis of Alaskan Arctic Tundra. Cold Regions Research and Engineering Laboratory. Hanover, NH. pp. 19.
93. Walker, D.A., Webber, P.J. 1976. Vegetation mapping of selected sites along the Yukon River-Prudhoe Bay Haul Road, Alaska. CRREL Progress Report. . 46 (plus 10 maps).
94. Walker, D.A., Webber, P.J. 1974. Vegetation map U.S. Tundra Biome study area, Barrow, Alaska (included in M.A. thesis of Walker (1977)).
95. Webber, P.J., Walker, D.A. 1973. Vegetation maps of the Gas Arctic Test Site, Prudhoe Bay, Alaska. 6.

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Theses:

1. Walker, D.A. 1977. The analysis of the effectiveness of a television scanning densitometer for indicating geobotanical features in an ice-wedge polygon complex at Barrow, Alaska. M.A. Thesis. 129 pp (2 maps).
2. Walker, D.A. 1981. The vegetation and environmental gradients of the Prudhoe Bay region, Alaska. Ph.D. Thesis. 484 pp (5 maps).

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Last modified September 20, 2012