1. 1Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, USA
2. 2Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
3. 3Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USA
4. 4National Center for Atmospheric Research, Boulder, CO, USA
5. 5Christian-Albrechts-Universität zu Kiel, Institut für Geographie, Kiel, Germany
6. 6WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland
7. 7Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany