[1] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA
[2] FAS, USDA, NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] NASA, Sci Syst & Applicat Inc, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[4] Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA
[5] Duke Univ, Nicholas Sch Environm & Earth Sci, Durham, NC 27708 USA
[6] NOAA, Climate Monitoring Diagnost Lab, Boulder, CO 80303 USA
[7] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
[8] Univ Colorado, Cooperat Inst Arctic & Alpine Res, Boulder, CO 80309 USA
[9] Univ Maryland, Dept Geog, College Pk, MD 20742 USA
[10] Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA