Possible causes of Arctic Tundra Vegetation Productivity Declines

Uma Suren Bhatt1, Donald A Walker1, Martha K Raynolds1, Peter Bieniek2, Howard E Epstein3, Josefino C Comiso4, Jorge E Pinzon5 and Compton J Tucker6, (1)University of Alaska Fairbanks, Fairbanks, AK, United States, (2)International Arctic Research Center, Fairbanks, AK, United States, (3)University of Virginia, Charlottesville, VA, United States, (4)NASA Goddard SFC, Greenbelt, MD, United States, (5)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (6)NASA Goddard Space Flight Cen., Greenbelt, MD, United States