1. Graduate School of Geography, Clark University, Worcester, MA 01610, USA.
2. Department of Atmospheric, Oceanic and Space Science, University of Michigan, Ann Arbor, MI 48109, USA.
3. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, CA 92093, USA.
4. Department of Geography, Trent University, Peterborough, Ontario K9J 7B8, Canada.
5. Department of Physics, University of Colorado at Boulder, Boulder, CO 80309, USA.
6. Bristol Glaciology Centre, School of Geographical Science, Bristol BS8 1SS, UK.
7. Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, USA.
8. Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Boulder, CO 80309, USA.
9. Centre National de la Recherche Scientifique, Université de Toulouse, LEGOS, 14 Avenue E. Belin, 31400 Toulouse, France.
10. Department of Earth Sciences, Uppsala University, SE-751 05 Uppsala, Sweden.
11. Institute of Arctic and Alpine Research, University of Colorado at Boulder, Boulder, CO 80309, USA.
12. Institute of Meteorology and Geophysics, Universität Innsbruck, A-6020 Innsbruck, Austria.
13. Utrecht University, Institute for Marine and Atmospheric Research Utrecht, 3508 TA Utrecht, Netherlands.
14. Department of Geography, University of Zurich, CH-8057 Zurich, Switzerland.
15. Institut für Kartographie, Technische Universität Dresden, D-01062 Dresden, Germany.
16. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.
17. Department of Geosciences, University of Oslo, Box 1047 Blindern, N-0316, Oslo, Norway.