Ralf Greve¹, Christopher Robert Scott Chambers¹, Reinhard Calov², Takashi Obase³, Fuyuki Saito⁴, Shun Tsutaki³ and Ayako Abe-Ouchi⁵, (1)Hokkaido University, Institute of Low Temperature Science, Sapporo, Japan, (2)Potsdam Institute for Climate Impact Research, Potsdam, Germany, (3)University of Tokyo, Atmosphere and Ocean Research Institute, Kashiwa, Japan, (4)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan, (5)University of Tokyo, Atmosphere and Ocean Research Institute, Bunkyo-ku, Japan