[1] Centre for Ice and Climate,Terrain Sciences Division
[2] Niels Bohr Institute,undefined
[3] University of Copenhagen,undefined
[4] Juliane Maries Vej 30,undefined
[5] DK-2100 Copenhagen Oe,undefined
[6] Denmark ,undefined
[7] Glaciology Section,undefined
[8] Geological Survey of Canada,undefined
[9] 601 Booth Street,undefined
[10] Ottawa,undefined
[11] Ontario,undefined
[12] Canada K1A 0E8,undefined
[13] Laboratoire de Glaciologie et Géophysique de l’Environnement,undefined
[14] CNRS/UJF,undefined
[15] BP 96,undefined
[16] 38402 Saint-Martin-d’Hères,undefined
[17] France ,undefined
[18] Arctic and Antarctic Research Institute,undefined
[19] 38 Bering Street,undefined
[20] St Petersburg 199397,undefined
[21] Russia ,undefined