Christo Buizert¹, T. J. Fudge², William Roberts³, Catherine Ritz⁴, Eric Lefebvre⁴, Sam Sherriff-Tadano⁵, Ayako Abe-Ouchi⁶, Carlos Martin⁷, Hugh F J Corr⁷, Jeffrey P Severinghaus⁸, Ross Beaudette⁹, Eric J. Steig¹⁰, Jenna Epifanio¹¹, Nicholas Siler¹¹, Edward Brook¹, Kenji Kawamura¹², Ikumi Oyabu¹³, Todd Sowers¹⁴, Michael Sigl¹⁵, Mirko Severi¹⁶ and Nelia Dunbar¹⁷, (1)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (2)University of Washington, Earth and Space Sciences, Seattle, WA, United States, (3)Northumbria University, Newcastle-Upon-Tyne, United Kingdom, (4)LGGE Laboratoire de Glaciologie et Géophysique de l’Environnement, Saint Martin d'Hères, France, (5)Atmosphere and Ocean Research Institute University of Tokyo, Tokyo, Japan, (6)University of Tokyo, Atmosphere and Ocean Research Institute, Bunkyo-ku, Japan, (7)NERC British Antarctic Survey, Cambridge, United Kingdom, (8)Scripps Institution of Oceanography, La Jolla, CA, United States, (9)University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, (10)University of Washington, Seattle, WA, United States, (11)Oregon State University, Corvallis, OR, United States, (12)Natl. Inst. of Polar Research, Tokyo, Japan, (13)National Institute of Polar Research, Tokyo, Japan, (14)Pennsylvania State University Main Campus, University Park, PA, United States, (15)Paul Scherrer Institut, Laboratory of Environmental Chemistry, Villigen, Switzerland, (16)University of Florence, Florence, Italy, (17)New Mexico Institute of Mining and Technology, Socorro, NM, United States