Ana Bastos, Ludwig Maximilians University of Munich, Dept. of Geography, Munich, Germany, Michael O'Sullivan, University of Leeds, Leeds, LS2, United Kingdom, Frédéric Chevallier, LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France, Christian Rödenbeck, Max Planck Institute for Biogeochemistry, Jena, Germany, Shilong Piao, Peking University, College of Urban and Environmental Sciences, Beijing, China, Stephen Sitch, University of Exeter, College of Life and Environmental Sciences, Exeter, United Kingdom, Julia Pongratz, Max Planck Institute for Meteorology, Hamburg, Germany, Benjamin Poulter, NASA GSFC, Biospheric Science, Greenbelt, MD, United States, Ashley Ballantyne, University of Montana, Missoula, MT, United States and Philippe Ciais, LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette, France