1. Institute for Space Sciences; CSIC-IEEC; Barcelona; Spain
2. Lamont-Doherty Earth Observatory; Columbia University; Palisades; New York; USA
3. Geological Survey of Denmark and Greenland; Copenhagen; Denmark
4. Harvard-Smithsonian Center for Astrophysics; Cambridge; Massachusetts; USA
5. Climate Change Institute; University of Maine; Orono; Maine; USA
6. Department of Geology; University of Kansas; Lawrence; Kansas; USA
7. DTU Space; National Space Institute; Copenhagen; Denmark