Ashley Ballantyne¹, Zhihua Liu¹, Benjamin Poulter², William Anderegg³ and Philippe Ciais⁴, (1)University of Montana, Missoula, MT, United States, (2)NASA GSFC, Biospheric Science, Greenbelt, MD, United States, (3)University of Utah, School of Biological Sciences, Salt Lake City, UT, United States, (4)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France