State Key Laboratory of Tropical Oceanography;
South China Sea Institute of Oceanology;
Chinese Academy of Sciences;
Guangzhou 510301;
China;
Institute of Deep-sea Science and Engineering;
Chinese Academy of Sciences;
Sanya 572000;
China;
Graduate School;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
South China University of Technology;
Guangzhou 510641;
China;
Hohai University;
Nanjing 210098;
China;
Center for Ocean Mega-Science;
Chinese Academy of Sciences;
Qingdao 266071;
China;
eastern Hainan upwelling; cold tongue; dissolved oxygen; phytoplankton community;