1. Nansen Environmental and Remote Sensing Center, Bergen, Norway
2. Department of Environmental Sciences, Western Norway University of Applied Sciences, Sogndal, Norway
3. Antarctic and Sub-Antarctic Program, Universidad de Magallanes, Punta Arenas, Chile
4. Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, Colorado, USA
5. Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark
6. Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark