The dominant role of semi-arid lands in the trend and variability of the land CO2 sink

Anders Ahlström1,2, Michael R Raupach3, Guy Schurgers4, Benjamin Smith5, Almut Arneth6, Martin Jung7, Markus Reichstein8, Josep Gili Canadell9, Pierre Friedlingstein10, Atul K. Jain11, Etsushi Kato12, Benjamin Poulter13, Stephen Sitch14, Benjamin David Stocker15, Nicolas Viovy16, Yingping Wang17, Andy Wiltshire18, Soenke Zaehle7 and Ning Zeng19, (1)Stanford University, Stanford, CA, United States, (2)Lund University, Department of Physical Geography and Ecosystem Science, Lund, Sweden, (3)Australian National University, Canberra, Australia, (4)University of Copenhagen, Department of Geosciences and Natural Resource Management, København K, Denmark, (5)21st Century Science and Technologyl, Washington, United States, (6)Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany, (7)Max Planck Institute for Biogeochemistry, Jena, Germany, (8)Max Planck Institute for Biogeochemistry, Department of Biogeochemical Integration, Jena, Germany, (9)CSIRO Ocean and Atmosphere, Canberra, ACT, Australia, (10)University of Exeter, College of Engineering, Mathematics and Physical Sciences, Exeter, EX4, United Kingdom, (11)University of Illinois at Urbana Champaign, Urbana, United States, (12)NIES National Institute of Environmental Studies, Ibaraki, Japan, (13)NASA GSFC, Biospheric Science, Greenbelt, United States, (14)University of Exeter, College of Life and Environmental Sciences, Exeter, United Kingdom, (15)Imperial College London, London, SW7, United Kingdom, (16)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette, France, (17)CSIRO, Ocean and Atmosphere Flagship, Aspendale, Australia, (18)Met Office Hadley center for Climate Change, Exeter, United Kingdom, (19)University of Maryland College Park, College Park, MD, United States
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