Christo Buizert, Oregon State University, Corvallis, OR, United States, Ayako Abe-Ouchi, University of Tokyo, Atmosphere and Ocean Research Institute, Bunkyo-ku, Japan, Guido Vettoretti, University of Copenhagen, København K, Denmark, Xu Zhang, ITP Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China, Yuta Kuniyoshi, AORI, The University of Tokyo, Kashiwa, JAPAN, Sarah Shackleton, Woods Hole Oceanographic Institution, Woods Hole, United States, Sune Rasmussen, Center for Ice and Climate, University of Copenhagen, Copenhagen, Denmark, Eric D Galbraith, McGill University, Earth and Planetary Sciences, Montreal, QC, Canada, Thomas F Stocker, University of Bern, Climate and Environmental Physics and Oeschger Center for Climate Change Research, Bern, Switzerland and Joel Pedro, Australian Antarctic Division, Kingston, Australia