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Seasonality of the Atmosphere-ocean-ice-terrestrial Environment of Arctic Tundra

Seasonality of the Atmosphere-ocean-ice-terrestrial Environment of Arctic Tundra
Type: 
Poster
Uma S Bhatt1, Donald A Walker2, Martha Raynolds3, Howard Epstein4, Gensuo Jia5, Josefino Comiso6, Jorge Pinzon7
1Atmospheric Sciences & Geophysical Institute, University of Alaska Fairbanks, 603 Koyukuk Dr, Fairbanks, AK, 99775, USA, Phone 907-474-2662, Fax 907-474-7290, usbhatt [at] alaska [dot] edu
2University of Alaska Fairbanks, Fairbanks, AK, 99775, USA, dawalker [at] alaska [dot] edu
3University of Alaska Fairbanks, Fairbanks, AK, 99775, USA, mkraynolds [at] alaska [dot] edu
4University of Virginia, Charlottesville, VA, USA, hee2b [at] virginia [dot] edu
5Chinese Academy of Sciences, Beijing, N.T., China, jiong [at] tea [dot] ac [dot] cn
6NASA Goddard, Greenbelt, MD, USA, Josefino [dot] C [dot] Comiso [at] nasa [dot] gov
7NASA Goddard, Greenbelt, MD, USA, jorge [dot] e [dot] pinzon [at] nasa [dot] gov

The strength of tundra productivity trends over the 1982-2008 period, as measured by the annual maximum Normalized Difference Vegetation Index (MaxNDVI) and time integrated NDVI (TI-NDVI), have generally increased throughout the Arctic but vary in strength regionally. The climatological annual cycle of sea-ice concentrations, and ocean and atmospheric temperatures also display distinct regional variations that may in part explain the spatially varied trends of vegetation greenness.

Changes in MaxNDVI are much greater in North America (9% increase) than Eurasia (2%). MaxNDVI has increased in the 50-km land domain contiguous to the Beaufort Sea by 17% since 1982 whereas it has only increased by 3% in coastal the Kara Sea region.

In Eurasia, Baffin Bay and the Canadian Archiepelago the MaxNDVI increases are most pronounced in the early part of the warm season, whereas in the Beaufort and Davis Straits the largest increases coincide with the the summer peak. The stronger spring greenup trends in Eurasia are likely associated with spring sea ice decreases whereas in the Beaufort and Davis Straits, the timing of 50% ice concentration is later by several weeks.

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National Science Foundation | Division of Arctic Sciences
National Science Foundation
National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration
International Arctic Systems for Observing the Atmosphere
International Arctic Systems for Observing the Atmosphere
Study of Environmental Arctic Change
Study of Environmental Arctic Change
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North Slope Science Initiative
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International Arctic Science Committee
Arctic Ocean Sciences Board
Arctic Ocean Sciences Board
Alaska Ocean Observing System
Alaska Ocean Observing System
Department of Energy
Department of Energy
National Aeronautics and Space Administration
National Aeronautics and Space Administration
World Wildlife Fund
WWF
Association of Polar Early Career Scientists
Association of Polar Early Career Scientists
Bureau of Land Management
Bureau of Land Management
International Study of Arctic Change
International Study of Arctic Change
ArcticNet
ArcticNet
DAMOCLES
Developing Arctic Modeling and Observing Capabilities for Long-term Environmental Studies

This work is supported by the National Science Foundation (NSF) under the ARCUS Cooperative Agreement ARC-0618885. Any opinions, findings, and conclusions or recommendations expressed do not necessarily reflect the views of the NSF.