1. Earth System Science Interdisciplinary Center; University of Maryland; College Park Maryland USA
2. Cryospheric Sciences Laboratory; NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. Now at Land Remote Sensing Program; U.S. Geological Survey; Reston Virginia USA
4. Department of Geological Sciences; Central Washington University; Ellensburg Washington USA
5. Department of Geography; University of Utah; Salt Lake City Utah USA
6. School of Earth and Climate Sciences; University of Maine; Orono Maine USA
7. Climate Change Institute; University of Maine; Orono Maine USA