1. Department of Earth and Space SciencesUniversity of Washington Seattle Washington USA
2. Courant Institute of Mathematical SciencesNew York University New York New York USA
3. Norwegian Polar InstitutePolar Environmental Centre Tromsø Norway
4. Department of Geosciences and Earth and Environmental Systems InstitutePennsylvania State University University Park Pennsylvania USA
5. Department of GeosciencesUniversity of Oslo Oslo Norway