Hai Wang¹, Xie shang-Ping², Yu Kosaka³, Qinyu Liu¹, Hiroki Tokinaga⁴ and Yan DU⁵, (1)Ocean University of China, Qingdao, China, (2)Scripps Institution of Oceanography, La Jolla, CA, United States, (3)University of Tokyo, Tokyo, Japan, (4)Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, (5)SCSIO, CAS, Guangzhou, China