Decadal variation and trend of the upper layer salinity in the South China Sea from 1960 to 2010

作     者：Wenjing ZHANG Weiqiang WANG Huibin XING Wenjing ZHANG;Weiqiang WANG;Huibin XING

作者机构：State Key Laboratory of Tropical OceanographySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of SciencesBeijing 100049China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China South China Sea Information CenterState Oceanic AdministrationGuangzhou 510301China South China Sea Marine Prediction CenterState Oceanic AdministrationGuangzhou 510310China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2022年第40卷第4期

页      面：1333-1348页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.91958202,41731173) the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA20060502) the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(No.GML2019ZD0306) the Key Research Program of the Chinese Academy of Sciences(No.ZDRWXH-2019-2) 

主　　题：salinity South China Sea(SCS) decadal variation trend salinity budget analysis 

摘      要：Ocean salinity is an essential measurable indicator of water cycle and plays a crucial role in regulating ocean and climate *** Simple Ocean Data Assimilation(SODA)reanalysis product,substantial decadal variability of the salinity in the upper layer of the South China Sea(SCS)from 1960 to 2010 was *** show that a decadal variation of the upper layer salinity is *** upper layer(100 m)waters are found to freshen from 1960,become saltier during 1975 to 1995,and freshen again from 1995 to *** strongest anomalies appear in the northeastern,northern,and northwestern regions in the three periods,*** salinity variation trends become weaker below the upper layer,except the salinifi cation trend in the northern SCS extends to at least 300 m during the salinifi cation *** of the salinity budget over the top 100 m shows that during the fi rst freshening period horizontal advection,vertical advection,and surface freshwater forcing all contribute to salinity freshening,and horizontal advection is relatively *** contribution of horizontal advection and surface freshwater forcing to the positive salinity anomaly is comparable,while the vertical advection is the secondary factor in the salinifi cation *** advection,especially zonal advection,plays a crucial role during the second freshening ***,horizontal advection is more important than that in the fi rst freshening *** addition,the contribution of horizontal advection is mainly in zonal direction controlled by Kuroshio *** analysis shows the upper-layer salinity variations have a Pacifi c Decadal Oscillation(PDO)-like signal,with freshening during the negative PDO years,and salinifi cation during the positive PDO *** mainly infl uences the upper-layer salinity changes through both atmospheric bridge and oceanic bridge.