1. Department of Geosciences University of Oslo Oslo Norway
2. Department of Biological and Environmental Sciences University of Gothenburg Gothenburg Sweden
3. Department of Environmental and Biological Sciences University of Eastern Finland Kuopio Finland
4. Department of Physical Geography Stockholm University Stockholm Sweden
5. Center for Permafrost (CENPERM) Department of Geosciences and Natural Resource Management University of Copenhagen Copenhagen Denmark
6. Department of Physical Geography and Ecosystem Science Lund University Lund Sweden