1. Environmental Archaeology and Materials Science The National Museum of Denmark IC Modewegsvej, Brede Lyngby DK‐2800 Denmark
2. Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management University of Copenhagen Øster Voldgade 10 DK‐1350 Copenhagen K Denmark
3. Greenland National Museum & Archives Hans Egedesvej 8, Boks 145, 3900 Nuuk Greenland
4. Danish Meteorological Institute (DMI) Lyngbyvej 100, DK‐2100 Copenhagen Ø Denmark