*Peien Xu¹、Zhendong Hu²、Zhiyu Liu²、Tomoki Tozuka¹、Tangdong Qu³ (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo、2.State Key Laboratory of Marine Environmental Science, and Department of Physical Oceanography, College of Ocean and Earth Sciences, Xiamen University、3.Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles)