Constance Lefebvre^1,2, Emilia Ridolfi¹, Paul Overduin², Jens Strauss², Claire Treat³, Lisa Bröder⁴, Susanne Liebner^5,6, John Paul Balmonte⁷, Maria De La Fuente Ruiz¹ and Sandra Arndt¹, (1)Université libre de Bruxelles, BGeoSys, Department Geosciences, Environment & Society (DGES), Brussels, Belgium, (2)Alfred Wegener Institute Helmholtz Center for Polar and Marine Research Potsdam, Permafrost Research Section, Potsdam, Germany, (3)Aarhus University, Department of Agroecology, Aarhus, Denmark, (4)ETH Zurich, Department of Earth Sciences, Zurich, Switzerland, (5)GFZ German Research Centre for Geosciences, Section Geomicrobiology, Potsdam, Germany, (6)University of Potsdam, Institute of Biochemistry and Biology, Potsdam, Germany, (7)Lehigh University, Department of Earth & Environmental Sciences, Bethlehem, United States