International Arctic Research Center, University of Alaska Fairbanks, 930 Koyukuk Drive, P.O. Box 757340, Fairbanks, AK 99775-7340 United States ; CNRS, Glaciology Laboratory, 54, rue Moliere, B.P. 96, Saint-Martin d'Heres, 38402 France
International Arctic Research Center, University of Alaska Fairbanks, 930 Koyukuk Drive, P.O. Box 757340, Fairbanks, AK 99775-7340 United States ; CNRS, Glaciology Laboratory, 54, rue Moliere, B.P. 96, Saint-Martin d'Heres, 38402 France ;
Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, P.O. Box 757320, Fairbanks, AK 99775-7320 United States ; Department of Chemistry, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775-6160 United States ;
Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, P.O. Box 757320, Fairbanks, AK 99775-7320 United States ; Department of Chemistry, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775-6160 United States ;
CNRS, Glaciology Laboratory, 54, rue Moliere, B.P. 96, Saint-Martin d'Heres, 38402 France ;
Cold Regions Research and Engineering Laboratory, P.O. Box 35170, Fort Wainwright, AK 99703-0170 United States ;
Cold Regions Research and Engineering Laboratory, P.O. Box 35170, Fort Wainwright, AK 99703-0170 United States ;
Department of Chemistry, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775-6160 United States ;