Eric J. Steig¹, Marina Duetsch¹, Peter N Blossey², Andrew Pauling³, Cecilia M Bitz³, Murat Aydin⁴, T. J. Fudge¹, Heidi A Roop⁵, Joseph M Souney Jr⁶, Mark Twickler⁶, Knut A Christianson¹, John Erich Christian¹, Lindsey Davidge¹, Benjamin H Hills⁷, Andrew Osten Hoffman¹, Nicholas Holschuh¹, Annika Noel Horlings¹ and Gemma K. O'Connor¹, (1)University of Washington, Earth and Space Sciences, Seattle, WA, United States, (2)University of Washington, Seattle, WA, United States, (3)University of Washington, Atmospheric Sciences, Seattle, WA, United States, (4)University of California Irvine, Irvine, CA, United States, (5)University of Minnesota, Department of Soil, Water, and Climate, Saint Paul, United States, (6)University of New Hampshire, Durham, NH, United States, (7)Applied Physics Laboratory University of Washington, Polar Science Center, Seattle, WA, United States

Joerg M Schaefer, Columbia University of New York, Palisades, NY, United States, Eric J. Steig, University of Washington, Earth and Space Sciences, Seattle, WA, United States and Qinghua Ding, University of California Santa Barbara, Santa Barbara, CA, United States

Ji-Hye Seo¹, Changhee Han², Siddhartha Bharadwaj¹, Gerhard Worner³, Jorgen Peder Steffensen⁴, Erich C Osterberg⁵, Sungmin Hong⁶ and Mukul Sharma¹, (1)Dartmouth College, Hanover, NH, United States, (2)Korea Polar Research Institute, Incheon, South Korea, (3)University of Goettingen, Gottingen, Germany, (4)Centre for Ice and Climate, Copenhagen, Denmark, (5)Dartmouth College, Department of Earth Sciences, Hanover, NH, United States, (6)Inha University, Ocean sciences, Incheon, South Korea

Shuting Zhai¹, Xuan Wang², Lei Geng³, Joseph R McConnell⁴, Tomás Sherwen⁵, Ryan Pound⁶, Nathan Chellman⁷, Jonathan Moch⁸, Lei Zhu⁹, Mathew J Evans¹⁰, Jihong Cole-Dai¹¹, Thomas Opel¹², Michael Sigl¹³, Hanno Meyer¹⁴, Shohei Hattori¹⁵, Yoshinori Iizuka¹⁶, Koji Fujita¹⁷, Yuk Chun Chan¹ and Becky Alexander¹, (1)University of Washington, Department of Atmospheric Sciences, Seattle, WA, United States, (2)City University of Hong Kong, Hong Kong, Hong Kong, (3)University of Science and Technology of China, Hefei, China, (4)Desert Res Inst, Reno, NV, United States, (5)University of York, Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, York, United Kingdom, (6)University of York, Department of Chemistry, York, United Kingdom, (7)Desert Research Institute, Reno, NV, United States, (8)Harvard University, Cambridge, MA, United States, (9)Southern University of Science and Technology, School of Environmental Science and Engineering, Shenzhen, China, (10)Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, United Kingdom, (11)South Dakota State University, Department of Chemistry and Biochemistry, Brookings, SD, United States, (12)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Department of Periglacial Research, Potsdam, Germany, (13)University of Bern, Climate and Environmental Physics, Bern, Switzerland, (14)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (15)Tokyo Institute of Technology, Yokohama, Japan, (16)Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan, (17)Nagoya University, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan

Sarah Shackleton¹, James Menking², Edward J Brook², Christo Buizert², Michael Dyonisius³, Vasilii V Petrenko⁴, Daniel Baggenstos⁵ and Jeffrey P Severinghaus⁶, (1)Princeton University, Princeton, NJ, United States, (2)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (3)Niels Bohr Institute, København Ø, Denmark, (4)University of Rochester, Department of Earth and Environmental Sciences, Rochester, NY, United States, (5)University of Bern, Bern, Switzerland, (6)Scripps Institution of Oceanography, La Jolla, CA, United States

Mackenzie M Grieman¹, Helene Hoffmann¹, Jack Humby², Robert Mulvaney³, Christoph Nehrbass-Ahles¹, Isobel Rowell¹ and Eric W Wolff¹, (1)University of Cambridge, Cambridge, United Kingdom, (2)NERC British Antarctic Survey, Cambridge, United Kingdom, (3)British Antarctic Survey, Cambridge, United Kingdom

John Patterson¹, Murat Aydin¹, Jeffrey P Severinghaus², Gabrielle Petron^3,4, Andrew M Crotwell^3,4 and Eric S Saltzman¹, (1)University of California Irvine, Irvine, CA, United States, (2)Scripps Institution of Oceanography, La Jolla, CA, United States, (3)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (4)National Oceanic and Atmospheric Administration, Global Monitoring Division, Earth System Research Laboratory, Boulder, CO, United States

Benjamin Young¹, Edward J Brook¹, James Lee², Julia Rosen¹, Jon Shelley Edwards¹, Michael Kalk¹ and Kaden Martin¹, (1)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (2)Los Alamos National Laboratory, Los Alamos, United States