Dr. Yusuke Kawaguchi, PhD, Atmosphere and Ocean Research Institute University of Tokyo, Tokyo, Japan, Mario Hoppmann, Alfred-Wegener-Institute, Oldenburg, Germany, Benjamin Rabe, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, Ivan Kuznetsov, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Climate Dynamics, Bremerhaven, Germany and Kunio Shirasawa, Hokkakido University, Institute of Low Temperature Science, Sapporo, Japan