Seasonal characteristics and formation mechanism of the thermohaline structure of mesoscale eddy in the South China Sea  

作　　者：Yongcan Zu Shuangwen Sun Wei Zhao Peiliang Li Baochao Liu Yue Fang Azizan Abu Samah 

机构地区：[1]College of Oceanic and Atmospheric Sciences,Ocean University of China [2]Center for Ocean and Climate Research,First Institute of Oceanography,Ministry of Natural Resources [3]Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology (Qingdao) [4]Ocean College,Zhejiang University [5]Institute of Ocean and Earth Sciences,University of Malaya

出　　处：《Acta Oceanologica Sinica》2019年第4期29-38,共10页海洋学报（英文版）

基　　金：The National Key R&D Program of China under contract No.2017YFC1405100;the National Natural Science Foundation of China under contract Nos 41576028,41306032 and 41876030;the NSFC-Shandong Joint Fund for Marine Science Research Centers under contract No.U1606405;the research fund from FIO-UM Joint Center of Marine Science and Technology

摘　　要：The seasonal characteristics and formation mechanism of the thermohaline structure of mesoscale eddy in the South China Sea are investigated using the latest eddy dataset and ARMOR3D data. Eddy-centric composites reveal that the horizontal distribution of temperature anomaly associated with eddy in winter is more of a dipole pattern in upper 50 m and tends to be centrosymmetric below 50 m, while in summer the distribution pattern is centrosymmetric in the entire water column. The horizontal distribution of eddy-induced salinity anomaly exhibits similar seasonal characteristics, except that the asymmetry of the salinity anomaly is weaker. The vertical distribution of temperature anomaly associated with eddy shows a monolayer structure, while the salinity anomaly demonstrates a triple-layer structure. Further analysis indicates that the vertical distribution of the anomalies is related to the vertical structure of background temperature and salinity fields, and the asymmetry of the anomalies in upper 50 m is mainly caused by the horizontal advection of background temperature and salinity.The seasonal characteristics and formation mechanism of the thermohaline structure of mesoscale eddy in the South China Sea are investigated using the latest eddy dataset and ARMOR3D data. Eddy-centric composites reveal that the horizontal distribution of temperature anomaly associated with eddy in winter is more of a dipole pattern in upper 50 m and tends to be centrosymmetric below 50 m, while in summer the distribution pattern is centrosymmetric in the entire water column. The horizontal distribution of eddy-induced salinity anomaly exhibits similar seasonal characteristics, except that the asymmetry of the salinity anomaly is weaker. The vertical distribution of temperature anomaly associated with eddy shows a monolayer structure, while the salinity anomaly demonstrates a triple-layer structure. Further analysis indicates that the vertical distribution of the anomalies is related to the vertical structure of background temperature and salinity fields, and the asymmetry of the anomalies in upper 50 m is mainly caused by the horizontal advection of background temperature and salinity.

关 键 词：MESOSCALE EDDY THERMOHALINE structure SEASONAL CHARACTERISTICS South China Sea 

分 类 号：P[天文地球]