Loeka Jongejans¹, Kai Mangelsdorf², Susanne Liebner³, Lutz Schirrmeister⁴, Mikhail Grigoriev⁵, Georgii M. Maksimov⁵, Boris K Biskaborn⁶, Guido Grosse⁴, Dirk Wagner⁷ and Jens Strauss⁴, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Potsdam, Germany, (2)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (3)GFZ German Research Centre for Geosciences, Section Geomicrobiology, Potsdam, Germany, (4)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Permafrost Research Section, Potsdam, Germany, (5)Melnikov Permafrost Institute SB RAS, Yakutsk, Russia, (6)Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany, (7)GFZ German Research Centre for Geosciences, Potsdam, Germany

Kimberley Rain Miner, NASA Jet Propulsion Laboratory, Pasadena, CA, United States, Charles E Miller, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, Merritt R Turetsky, University of Guelph, Guelph, ON, Canada, Annett Bartsch, Vienna University of Technology, Vienna, Austria, Johanna Tamminen, Finnish Meteorological Inst., Helsinki, Finland, Andreas Fix, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institute of Atmospheric Physics, Oberpfaffenhofen, Germany, Colm Sweeney, NOAA Global Monitoring Laboratory, Boulder, CO, United States and Arctic Methane Challenge

Juliana Drozd, Massachusetts Institute of Technology, Cambridge, MA, United States, Thomas W. Evans, Massachusetts Institute of Technology, Cambridge, United States and Roger E Summons, Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States

Pacifica Sommers, University of Colorado, Boulder, Ecology and Evolutionary Biology, Boulder, CO, United States, Dorota Porazinska, University of Florida, Department of Entomology and Nematology, Gainesville, United States, John L Darcy, University of Colorado, Denver, United States, Adam Solon, University of Colorado, Boulder, United States, Lara Vimercati, University of Colorado at Boulder, Boulder, United States, Eli M.S. Gendron, University of Florida, Ft Walton Beach, United States and Steven K Schmidt, Univ Colorado, Ecology and Evolutionary Biology, Boulder, CO, United States

Jon Hawkings¹, Benjamin Linhoff², Jemma Wadham³, Marek Stibal⁴, Carl H Lamborg⁵, Gregory T Carling⁶, Lukáš Falteisek⁴, Rachael Ward⁷, Katharine R Hendry⁷, Sarah Tingey⁸, Guillaume Lamarche-Gagnon⁸, Tyler Kohler⁹, Anne Kellerman¹, Karen Cameron¹⁰, Jade Hatton¹¹, Amy Holt¹², Petra Vinšová⁴, Stefan Hofer¹³, Marie Bulínová¹⁴, Tomáš Větrovský¹⁵, Lorenz Meire¹⁶ and Robert G Spencer¹, (1)Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, United States, (2)Massachusetts Institute of Technology, Cambridge, MA, United States, (3)Bristol Glaciology Centre, University of Bristol, Bristol, United Kingdom, (4)Charles University, Department of Ecology, Prague, Czech Republic, (5)University of California, Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (6)Brigham Young University, Provo, UT, United States, (7)University of Bristol, School of Earth Sciences, Bristol, United Kingdom, (8)University of Bristol, School of Geographical Sciences, Bristol, United Kingdom, (9)Swiss Federal Institute of Technology Lausanne, School of Architecture, Civil and Environmental Engineering, Lausanne, Switzerland, (10)University of Glasgow, School of Geographical and Earth Sciences, Glasgow, United Kingdom, (11)University of Bristol, Bristol, United Kingdom, (12)Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, United States, (13)University of Oslo, Oslo, Norway, (14)The Arctic University of Norway, Tromsø, Norway, (15)Academy of Sciences of the Czech Republic, Institute of Microbiology, Prague, Czech Republic, (16)Greenland Institute of Natural Resources, Nuuk, Greenland

Jason Fellman¹, Eran W Hood¹, Megan Irene Behnke², David V D'Amore³, Emily Whitney¹ and Robert G Spencer⁴, (1)University of Alaska Southeast, Juneau, AK, United States, (2)Florida State University, Department of Earth, Ocean, and Atmospheric Science, Tallahassee, FL, United States, (3)Pacific Northwest Research Station, USDA Forest Service, Juneau, AK, United States, (4)Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, United States

Croix Fylpaa¹, Eran W Hood², Jason Fellman², David V D'Amore³ and Emily Whitney², (1)University of Alaska Fairbanks, Fairbanks, AK, United States, (2)University of Alaska Southeast, Juneau, AK, United States, (3)Pacific Northwest Research Station, USDA Forest Service, Juneau, AK, United States

Sian Liao, Brown University, Chemistry, Providence, RI, United States, Sophia Yin, Brown University, Providence, United States and Yongsong Huang, Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States

Anabel von Jackowski¹, Judith Piontek², Vanessa Lampe¹ and Anja Engel¹, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)Leibniz Institute for Baltic Sea Research, Warnemünde, Germany