1. Department of Geography and Environmental Management; University of Waterloo; Waterloo Ontario Canada
2. Cryospheric Sciences Laboratory; NASA Goddard Space Flight Center; Greenbelt MD USA
3. Laboratory of Hydraulics, Hydrology and Glaciology (VAW); ETH Zurich; Zurich Switzerland
4. Geology Department; State University of New York at Buffalo; Buffalo NY USA
5. Earth System Science Interdisciplinary Center; University of Maryland; College Park MD USA
6. Department of Earth System Science; University of California; Irvine CA USA