Goddard Earth Sciences and Technology Center (GEST), UMBC, NASA/Goddard Space Flight Center Climate & Radiation Branch Mail Code 613.2, Greenbelt, MD 20771 United States
Alfred Wegener Institute for Polar and Marine Research, PO Box 12 01 61, Bremerhaven, 27515 Germany
Niels Bohr Institute, Ice and Climate Research, University of Copenhagen, Juliane Maries Vej 30, Copenhagen, 2100 Denmark
Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Postfach 611, Duebendorf, 8600 Switzerland