Takeshi Horinouchi, Hokkaido University, Sapporo, Japan, Yukari N Takayabu, AORI/University of Tokyo, Kashiwa, Chiba, Japan, Yoshio Kawatani, JAMSTEC, Yokohama, Japan, Tomoaki Ose, Meteorological Research Institute, Ibaraki, Japan, Naoki Sato, Tokyo Gakugei University, Koganei, Tokyo, Japan and Ryosuke Shibuya, University of Tokyo, Kashiwa, Japan