1. Global Modeling and Assimilation Office NASA Goddard Space Flight Center Greenbelt MD USA
2. Cryospheric Sciences Laboratory NASA Goddard Space Flight Center Greenbelt MD USA
3. Fluid Dynamics and Solid Mechanics Group Los Alamos National Laboratory Los Alamos NM USA
4. Jackson School of Geosciences University of Texas at Austin Austin TX USA
5. Glaciology and Geomorphodynamics Group, Department of Geography University of Zürich Hanover NH USA
6. Department of Earth Sciences Dartmouth College Zürich Switzerland
7. Now at Department of Earth Sciences University of Oregon Eugene OR USA
8. Laboratory of Hydraulics, Hydrology and Glaciology Swiss Federal Institute of Technology (ETH) Zürich Switzerland
9. Cold Regions Research and Engineering Laboratory Hanover NH USA