Permafrost Research Section, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Telegrafenberg A45, 14473, Potsdam, Germany. jan.nitzbon@awi.de.
Geography Department, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099, Berlin, Germany. jan.nitzbon@awi.de.
Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0316, Oslo, Norway. jan.nitzbon@awi.de.