Affiliation: | 1. Max Planck Institute for Biogeochemistry, PO Box 100164, 07701 Jena, Germany, 2. Center for Climatic Research, University of Wisconsin-Madison, 1225 West Dayton Street, Madison, WI 53706, USA, 3. Department of Geography, University of Oregon, Eugene, Oregon, OR 97403-1251, USA, 4. National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307, USA, 5. U.S. Geological Survey, Earth Surface Processes Team, Box 25046, MS980, Denver, CO 80225, USA,
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