1. Department of Earth System Science; University of California; Irvine; California; USA
2. NASA Goddard Space Flight Center; Greenbelt; Maryland; USA
3. Science Systems and Applications Inc.; Greenbelt; Maryland; USA
4. Geography Department; University of California; Santa Barbara; California; USA
5. Nicholas School of the Environment and Earth Sciences; Duke University; Durham; North Carolina; USA
6. Cooperative Institute of Arctic and Alpine Research; University of Colorado; Boulder; Colorado; USA
7. Department of Geography; University of Maryland; College Park; Maryland; USA