1. Department of Civil and Environmental Engineering and Institute of Arctic and Alpine ResearchUniversity of Colorado Boulder Boulder Colorado USA
2. National Snow and Ice Data CenterUniversity of Colorado Boulder Boulder Colorado USA
3. Department of Marine SciencesUniversity of Connecticut Storrs Connecticut USA
4. National Oceanic and Atmospheric AdministrationEarth System Research Laboratory Boulder Colorado USA
5. National Center for Atmospheric Research Boulder Colorado USA
6. Department of Arctic TechnologyUniversity Center on Svalbard Longyearbyen Svalbard
7. Jet Propulsion LaboratoryCalifornia Institute of Technology Pasadena California USA