1. U.S. Department of Agriculture Forest Service, Newtown Square, PA 19073, USA.
2. Key Laboratory for Earth Surface Processes, Ministry of Education, Peking University, Beijing, 100871 China.
3. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 China.
4. Woods Hole Research Center, Falmouth, MA 02543, USA.
5. University of Helsinki, Helsinki, Finland.
6. Natural Resources Canada, Canadian Forest Service, Victoria, BC, V8Z 1M5, Canada.
7. School of Geography, University of Leeds, LS2 9JT, UK.
8. International Institute for Applied Systems Analysis, Laxenburg, Austria.
9. Global Carbon Project, Commonwealth Scientific and Industrial Research Organization Marine and Atmospheric Research, Canberra, Australia.
10. Laboratoire des Sciences du Climat et de l’Environnement CEA-UVSQ-CNRS, Gif sur Yvette, France.
11. Duke University, Durham, NC 27708, USA.
12. Princeton University, Princeton, NJ 08544, USA.
13. U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, University of Alaska, Fairbanks, AK 99775, USA.
14. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.