1. Glaciology Group, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, UK.
2. Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, 9037 Tromsø, Norway.
3. Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth SY23 3DB, UK.
4. Institute of Applied Geoscience, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK.
5. Scott Polar Research Institute, Department of Geography, University of Cambridge, Cambridge CB2 1ER, UK.
6. Department of Geography and Environmental Management, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
7. Norwegian Polar Institute, Fram Centre, 9296 Tromsø, Norway.
8. Department of Earth Sciences, Uppsala Universitet, Villavägen 16, 752 36 Uppsala, Sweden.