1. Centre for Glaciology, Department of Geography and Earth Sciences; Aberystwyth University; Aberystwyth UK
2. Scott Polar Research Institute; Cambridge University; Cambridge UK
3. British Antarctic Survey; National Environmental Research Council; Cambridge UK
4. Helmholtz Centre for Polar and Marine Research; Alfred Wegener Institute; Bremerhaven Germany
5. Glaciology and Climate, Geological Survey of Denmark and Greenland; Copenhagen Denmark
6. Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology; Arctic University of Norway; Tromsø Norway