1. Department of Arctic Geophysics The University Centre in Svalbard Longyearbyen Norway
2. Department of Geosciences Colorado State University Fort Collins Colorado USA
3. U.S. Geological Survey Alaska Science Center Anchorage Alaska USA
4. National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder Colorado USA
5. Polar Science Center, Applied Physics Laboratory University of Washington Seattle Washington USA