Key Laboratory of Marine Hazards Forecasting;
Ministry of Natural Resources;
Hohai University;
Nanjing 210098;
China;
College of Oceanography;
Hohai University;
Nanjing 210098;
China;
Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai);
Zhuhai 519000;
China;
barrier layer thickness; interannual variability; eastern equatorial Indian Ocean; Bay of Bengal;