YuXiang Qiao, Tohoku University, Sendai, Japan, Hirohiko Nakamura, Fac. Fisheries, Kagoshima University, Kagoshima, Japan, Tomohiko Tomita, Kumamoto University, Faculty of Advanced Science and Technology, Kumamoto, Japan, Zhao-Jun Liu, Second Institute of Oceanography, Ministry of Natural Resources, State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou, China, Ning Zhao, JAMESTEC, Tokyo, Japan and Shusaku Sugimoto, Graduate School of Science, Tohoku University, Sendai, Japan