Yan DU, SCSIO South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China, Lianyi Zhang, SCSIO South China Sea Institute of Oceanology, Chinese Academy of Sciences, China, Wenju Cai, Centre for Southern Hemisphere Oceans Research (CSHOR), CSIRO Oceans and Atmosphere, Hobart, VIC, Australia, Zesheng Chen, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China, Tomoki Tozuka, The University of Tokyo, Tokyo, Japan and Jin-Yi Yu, Univ California Irvine, Department of Earth System Science, Irvine, CA, United States