Donald A. Walker

发表

Differentiating among Four Arctic Tundra Plant Communities at Ivotuk, Alaska Using Field Spectroscopy

Howard E. Epstein, Sara N. Bratsch, Marcel Buchhorn, 2016, Remote. Sens..

Virginian Tobacco During the Reigns of the Early Stuarts: A Case Study of Mercantilist Theories, Policies, and Results

Donald A. Walker, 1993 .

Recent Declines in Warming and Vegetation Greening Trends over Pan-Arctic Tundra

Compton J. Tucker, Jorge E. Pinzón, Howard E. Epstein, 2013, Remote. Sens..

Regional Patterns and Asynchronous Onset of Ice-Wedge Degradation since the Mid-20th Century in Arctic Alaska

M. Torre Jorgenson, Gerald V. Frost, Tracy Christopherson, 2018, Remote. Sens..

Ground-Based Hyperspectral Characterization of Alaska Tundra Vegetation along Environmental Gradients

Marcel Schwieder, Howard E. Epstein, Birgit Heim, 2013, Remote. Sens..

NDVI, biomass, and landscape evolution of glaciated terrain in northern Alaska

Donald A. Walker, Nancy A. Auerbach, N. Auerbach, 1995, Polar Record.

Plant communities of a tussock tundra landscape in the Brooks Range Foothills, Alaska

Donald A. Walker, Nancy A. Auerbach, N. Auerbach, 1994 .

Identification of unrecognized tundra fire events on the north slope of Alaska

Guido Grosse, Benjamin M. Jones, Christopher D. Arp, 2013 .

Spatial characteristics of AVHRR-NDVI along latitudinal transects in northern Alaska

Howard E. Epstein, Donald A. Walker, D. Walker, 2002 .

Patterned-ground plant communities along a bioclimate gradient in the High Arctic, Canada

Donald A. Walker, Martha K. Raynolds, D. Walker, 2008 .

Terrain, vegetation and landscape evolution of the R4D research site, Brooks Range Foothills, Alaska

Donald A. Walker, Barry Michael Evans, D. Walker, 1989 .

Role of vegetation and climate in permafrost active layer depth in arctic tundra of northern Alaska and Canada

Howard E. Epstein, Donald A. Walker, D. Walker, 2004 .

Soil climate and frost heave along the Permafrost/Ecological North American Arctic Transect

Donald A. Walker, Vladimir E. Romanovsky, D. Walker, 2006 .

Accuracy Assessment of a Land-Cover Map of the Kuparu k River Basin, Alaska: Considerations for Remote Regions

Donald A. Walker, James G. Bockheim, Nancy A. Auerbach, 1998 .

Degradation and stabilization of ice wedges: Implications for assessing risk of thermokarst in northern Alaska

Marcel Buchhorn, Donald A. Walker, Dana R. N. Brown, 2017 .

Long-term experimental manipulation of winter snow regime and summer temperature in arctic and alpine tundra

M. H. Jones, Donald A. Walker, Timothy R. Seastedt, 1999 .

Use of Geobotanical Maps and Automated Mapping Techniques to Examine Cumulative Impacts in the Prudhoe Bay Oilfield, Alaska

Donald A. Walker, D. Walker, M. D. Walker, 1986, Environmental Conservation.

Effects of deglaciation on circumpolar distribution of arctic vegetation

Donald A. Walker, Martha K. Raynolds, D. Walker, 2009 .

NDVI patterns and phytomass distribution in the circumpolar Arctic

Donald A. Walker, H. A. Maier, Martha K. Raynolds, 2006 .

EFFECTS OF ROADSIDE DISTURBANCE ON SUBSTRATE AND VEGETATION PROPERTIES IN ARCTIC TUNDRA

Donald A. Walker, Nancy A. Auerbach, N. Auerbach, 1997 .

A raster version of the Circumpolar Arctic Vegetation Map (CAVM)

Ian Olthof, Lennart Nilsen, M. Torre Jorgenson, 2019, Remote Sensing of Environment.

Arctic patterned-ground ecosystems: A synthesis of field studies and models along a North American Arctic Transect

William B. Krantz, Howard E. Epstein, Donald A. Walker, 2008 .

State of the Climate in 2018

W. Paul Menzel, Craig S. Long, Chris Derksen, 2019, Bulletin of the American Meteorological Society.

A map analysis of patterned‐ground along a North American Arctic Transect

Donald A. Walker, Martha K. Raynolds, D. Walker, 2008 .

Remote sensing of vegetation and land-cover change in Arctic Tundra Ecosystems

Ranga B. Myneni, Liming Zhou, Craig E. Tweedie, 2004 .

Circumpolar Arctic vegetation: a hierarchic review and roadmap toward an internationally consistent approach to survey, archive and classify tundra plot data

Howard E. Epstein, Marcel Buchhorn, Donald A. Walker, 2016 .

sPlot – A new tool for global vegetation analyses

Josep Peñuelas, Richard Field, Jürgen Homeier, 2019, Journal of Vegetation Science.

Estimating active-layer thickness over a large region: Kuparuk River Basin, Alaska, U.S.A

Kenneth M. Hinkel, Donald A. Walker, James G. Bockheim, 1997 .

History and pattern of disturbance in Alaskan Arctic terrestrial ecosystems : a hierarchical approach to analysing landscape change

Donald A. Walker, D. Walker, M. D. Walker, 1991 .

Introduction to special section on Biocomplexity of Arctic Tundra Ecosystems

Howard E. Epstein, Donald A. Walker, J. Welker, 2008 .

Pan-Arctic ice-wedge degradation in warming permafrost and its influence on tundra hydrology

Anna Liljedahl, Guido Grosse, Donatella Zona, 2016 .

The Circumpolar Arctic vegetation map

Donald A. Walker, Martha K. Raynolds, Arve Elvebakk, 2005 .

Implications of Arctic Sea Ice Decline for the Earth System

John E. Walsh, Donald A. Walker, Uma S. Bhatt, 2014 .

Plant communities and soils in cryoturbated tundra along a bioclimate gradient in the Low Arctic, Alaska

Donald A. Walker, Martha K. Raynolds, D. Walker, 2005 .

Climate change and Arctic ecosystems: 1. Vegetation changes north of 55°N between the last glacial maximum, mid‐Holocene, and present

Sandy P. Harrison, Jed O. Kaplan, Wolfgang Cramer, 2003 .

Rescuing Valuable Arctic Vegetation Data for Biodiversity Models, Ecosystem Models and a Panarctic Vegetation Classification

Miska Luoto, Niels Martin Schmidt, Donald A. Walker, 2013 .

The regional species richness and genetic diversity of Arctic vegetation reflect both past glaciations and current climate

Antoine Guisan, Miska Luoto, Niels Martin Schmidt, 2016 .

Patterns of Change within a Tundra Landscape: 22-year Landsat NDVI Trends in an Area of the Northern Foothills of the Brooks Range, Alaska

David L. Verbyla, Donald A. Walker, Martha K. Raynolds, 2013 .

The impact of lower sea-ice extent on Arctic greenhouse-gas exchange

Søren Rysgaard, Donald A. Walker, Torben R. Christensen, 2013 .

Vegetation of zonal patterned‐ground ecosystems along the North America Arctic bioclimate gradient

Howard E. Epstein, Donald A. Walker, Martha K. Raynolds, 2011 .

Cumulative Effects of Rapid Land-Cover and Land-Use Changes on the Yamal Peninsula, Russia

Jed O. Kaplan, Howard E. Epstein, Donald A. Walker, 2010 .

The Circumpolar Arctic Vegetation Map: AVHRR-derived base maps, environmental controls, and integrated mapping procedures

Donald A. Walker, H. A. Maier, Martha K. Raynolds, 2002 .

Summer Differences among Arctic Ecosystems in Regional Climate Forcing

F. Stuart Chapin, Donald A. Walker, Werner Eugster, 2000 .

Controls over intra-seasonal dynamics of AVHRR NDVI for the Arctic tundra in northern Alaska

Howard E. Epstein, Donald A. Walker, D. Walker, 2004 .

Spatial and temporal patterns of greenness on the Yamal Peninsula, Russia: interactions of ecological and social factors affecting the Arctic normalized difference vegetation index

Jed O. Kaplan, Howard E. Epstein, Donald A. Walker, 2009 .

Seasonal and Long-Term Changes to Active-Layer Temperatures after Tall Shrubland Expansion and Succession in Arctic Tundra

Gerald V. Frost, Howard E. Epstein, Donald A. Walker, 2018, Ecosystems.

Effects of Crude and Diesel Oil Spills on Plant Communities at Prudhoe Bay, Alaska, and the Derivation of Oil Spill Sensitivity Maps

Donald A. Walker, K. R. Everett, D. Walker, 1978 .

Recent dynamics of arctic and sub-arctic vegetation

Howard E. Epstein, Donald A. Walker, Isla H. Myers-Smith, 2013 .

Characteristics of cryogenic soils along a latitudinal transect in arctic Alaska

Donald A. Walker, James G. Bockheim, Chien-Lu Ping, 1998 .

Environmental variation, vegetation distribution, carbon dynamics and water/energy exchange at high latitudes

Brian Huntley, Eric S. Kasischke, Larry D. Hinzman, 2002 .

Climate Change Drives Widespread and Rapid Thermokarst Development in Very Cold Permafrost in the Canadian High Arctic

Donald A. Walker, Vladimir E. Romanovsky, Dmitry Nicolsky, 2019, Geophysical Research Letters.

Spatial interrelationships between terrain, snow distribution and vegetation patterns at an arctic foothills site in Alaska

Donald A. Walker, Barry Michael Evans, G. W. Petersen, 1989 .

Circumpolar Arctic Vegetation Classification

Lennart Nilsen, Howard E. Epstein, Birgit Heim, 2017 .

Satellite-derived vegetation index and cover type maps for estimating carbon dioxide flux for arctic tundra regions

Stuart R. Phinn, Douglas A. Stow, Donald A. Walker, 1998 .

Conservation of Arctic Flora and Fauna (CAFF) Map No. 1.

Donald A. Walker, Martha K. Raynolds, D. Walker, 2003 .

High stocks of soil organic carbon in the North American Arctic region

Howard E. Epstein, Donald A. Walker, Vladimir E. Romanovsky, 2008 .

Increased wetness confounds Landsat-derived NDVI trends in the central Alaska North Slope region, 1985–2011

Donald A. Walker, Martha K. Raynolds, D. Walker, 2016 .

Wetland Soils and Vegetation, Arctic Foothills, Alaska.

Donald A. Walker, K. R. Everett, D. Walker, 1989 .

The nature of spatial transitions in the Arctic

Howard E. Epstein, Donald A. Walker, Jason Beringer, 2004 .

Landsat MSS-derived land-cover map of northern Alaska: Extrapolation methods and a comparison with photo-interpreted and AVHRR-derived maps

Donald A. Walker, Adina Racoviteanu, S. Muller, 1999 .

Climate change and Arctic ecosystems: 2. Modeling, paleodata‐model comparisons, and future projections

Sandy P. Harrison, Jed O. Kaplan, Wolfgang Cramer, 2003 .

State of the Arctic Report.

Michael Karcher, John E. Walsh, Julienne C. Stroeve, 2006 .

Active‐layer thickness in north central Alaska: Systematic sampling, scale, and spatial autocorrelation

Kenneth M. Hinkel, Donald A. Walker, D. Walker, 1998 .

Spatial heterogeneity of tundra vegetation response to recent temperature changes

Howard E. Epstein, Donald A. Walker, D. Walker, 2006 .