Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;
Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;
Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;
Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;
Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;
First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;
drifting buoy; surface circulation; subtropical gyres;