David Wagner^1,2, Matthew Shupe^3,4, Ola P G Persson^3,4, Markus M Frey⁵, Amelie Kirchgaessner⁵, Ian Raphael⁶, David Clemens-Sewall⁶, Chris Polashenski^6,7, Julia Regnery⁸, Stefan Hendricks⁸, Marc Oggier⁹, Glen E Liston¹⁰, Martin Schneebeli¹ and Michael Lehning^1,2, (1)WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland, (2)Swiss Federal Institute of Technology Lausanne, CRYOS - School of Architecture, Civil and Environmental Engineering, Lausanne, Switzerland, (3)University of Colorado at Boulder, Cooperative Institute for the Research in Environmental Sciences, Boulder, CO, United States, (4)NOAA, Physical Science Laboratory, Boulder, CO, United States, (5)NERC British Antarctic Survey, Cambridge, United Kingdom, (6)Dartmouth College, Thayer School of Engineering, Hanover, NH, United States, (7)USACE-CRREL, Alaska Projects Office, Ft. Wainwright, AK, United States, (8)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (9)University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, AK, United States, (10)Colorado State University, Cooperative Institute for Research in the Atmosphere (CIRA), Fort Collins, CO, United States

Julia Regnery¹, Stefanie Arndt², Marcel Nicolaus³, Stefan Hendricks², Glen E Liston⁴, Marc Oggier⁵, Polona Itkin⁶, Matthias Jaggi⁷, Robert Ricker², Melinda Webster⁵, H. Jakob Belter², Mario Hoppmann⁸ and Donald K Perovich⁹, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Potsdam, Germany, (2)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (3)Alfred Wegener Institute, Bremerhaven, Germany, (4)Colorado State University, Cooperative Institute for Research in the Atmosphere (CIRA), Fort Collins, CO, United States, (5)University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, AK, United States, (6)UiT The Arctic University of Norway, Tromsø, Norway, (7)WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland, (8)Alfred-Wegener-Institute, Oldenburg, Germany, (9)USA CRREL, Hanover, NH, United States

David Clemens-Sewall¹, Chris Polashenski^1,2, Donald K Perovich¹, Ian Raphael¹, Steven Fons³, Polona Itkin⁴, Matthias Jaggi⁵, Arttu Jutila⁶, Amy Macfarlane⁵, Ilkka Matero⁶, Marcel Nicolaus⁷, Marc Oggier⁸, Martin Schneebeli⁹ and David Wagner¹⁰, (1)Dartmouth College, Thayer School of Engineering, Hanover, NH, United States, (2)USACE-CRREL, Alaska Projects Office, Ft. Wainwright, AK, United States, (3)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (4)UiT The Arctic University of Norway, Tromsø, Norway, (5)WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland, (6)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (7)Alfred Wegener Institute, Bremerhaven, Germany, (8)University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, AK, United States, (9)WSL Inst. Snow & Avalanche Research SLF, Davos Dorf, Switzerland, (10)Swiss Federal Institute of Technology Lausanne, CRYOS - School of Architecture, Civil and Environmental Engineering, Lausanne, Switzerland

Marcel Nicolaus¹, Donald K Perovich², Stefanie Arndt¹, Gerit Birnbaum¹, Mats A Granskog³, Jari Juhani Haapala⁴, Christian Haas¹, Stefan Hendricks¹, Knut V. Høyland⁵, Jennifer Hutchings⁶, Polona Itkin^7,8, Thomas Krumpen¹, Bonnie Light⁹, Christopher Mark Polashenski¹⁰, Martin Schneebeli¹¹, Gunnar Spreen³, Melinda Webster¹² and Natascha Oppelt¹³, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (2)Dartmouth College, Thayer School of Engineering, Hanover, NH, United States, (3)Norwegian Polar Institute, Tromsø, Norway, (4)Finnish Meteorological Institute, Helsinki, Finland, (5)Norwegian University of Science and Technology, Trondheim, Norway, (6)Oregon State University, Corvallis, OR, United States, (7)UiT The Arctic University of Norway, Tromsø, Norway, (8)Colorado State University, Cooperative Institute for Research in the Atmosphere (CIRA), Fort Collins, CO, United States, (9)University of Washington, Seattle, WA, United States, (10)US Army Cold Regions, Hanover, NH, United States, (11)WSL Inst. Snow & Avalanche Research SLF, Davos Dorf, Switzerland, (12)University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, AK, United States, (13)Kiel University, Kiel, Germany

Polona Itkin^1,2, Stefan Hendricks³, Robert Ricker³, Marc Oggier⁴, Matthias Jaggi⁵, Martin Schneebeli⁵, Stefanie Arndt³, Amy Macfarlane⁵, Melinda Webster⁴ and Glen E Liston², (1)UiT The Arctic University of Norway, Tromsø, Norway, (2)Colorado State University, Cooperative Institute for Research in the Atmosphere (CIRA), Fort Collins, CO, United States, (3)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (4)University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, AK, United States, (5)WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland

Mats A Granskog¹, Ioanna Merkouriadi², Glen E Liston³ and Bin Cheng², (1)Norwegian Polar Institute, Tromsø, Norway, (2)Finnish Meteorological Institute, Helsinki, Finland, (3)Colorado State University, Cooperative Institute for Research in the Atmosphere (CIRA), Fort Collins, CO, United States

Alex Cabaj, University of Toronto, Department of Physics, Toronto, ON, Canada, Paul J Kushner, University of Toronto, Physics, Toronto, ON, Canada and Alek Petty, Earth System Science Interdisciplinary Center, COLLEGE PARK, MD, United States

Marika M Holland, National Center for Atmospheric Research, Boulder, CO, United States, David Clemens-Sewall, Dartmouth College, Thayer School of Engineering, Hanover, NH, United States, Bonnie Light, University of Washington, Seattle, WA, United States, Donald K Perovich, USA CRREL, Hanover, NH, United States, Christopher Mark Polashenski, US Army Cold Regions, Hanover, NH, United States, Madison Smith, Applied Physics Laboratory University of Washington, Seattle, WA, United States and Melinda Webster, University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, AK, United States