Interannual to decadal variation of spring sea level anomaly in the western South China Sea  

作　　者：QIU Fuwen FANG Wendong PAN Aiju CHA Jing ZHANG Shanwu HUANG Jiang 丘福文;方文东;潘爱军;查晶;张善武;黄奖(Third Institute of Oceanography, State Oceanic Administration;State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences)

机构地区：[1]Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China [2]State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences Guangzhou 510301, China

出　　处：《Chinese Journal of Oceanology and Limnology》2017年第1期79-88,共10页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Nos.41306026,41176025,41176031);the Scientific Research Foundation of the Third Institute of Oceanography,SOA(No.2008014);the Chinese Academy of Sciences Strategic Leading Science and Technology Projects(No.XDA1102030104);the Global Change and Ocean-Atmosphere Interaction(No.GASI-03-01-01-03);the National Special Research Fund for Non-Profit Marine Sector(No.201005005-2)

摘　　要：Satellite observations of sea level anomalies(SLA) from January 1993 to December 2012 are used to investigate the interannual to decadal changes of the boreal spring high SLA in the western South China Sea(SCS) using the Empirical Orthogonal Function(EOF) method. We find that the SLA variability has two dominant modes. The Sea Level Changing Mode(SLCM) occurs mainly during La Ni?a years, with high SLA extension from west of Luzon to the eastern coast of Vietnam along the central basin of the SCS, and is likely induced by the increment of the ocean heat content. The Anticyclonic Eddy Mode(AEM) occurs mainly during El Ni?o years and appears to be triggered by the negative wind curl anomalies within the central SCS. In addition, the spring high SLA in the western SCS experienced a quasi-decadal change during 1993–2012; in other words, the AEM predominated during 1993–1998 and 2002–2005, while the La Ni?a-related SLCM prevailed during 1999–2001 and 2006–2012. Moreover, we suggest that the accelerated sea level rise in the SCS during 2005–2012 makes the SLCM the leading mode over the past two decades.Satellite observations of sea level anomalies（SLA） from January 1993 to December 2012 are used to investigate the interannual to decadal changes of the boreal spring high SLA in the western South China Sea（SCS） using the Empirical Orthogonal Function（EOF） method. We find that the SLA variability has two dominant modes. The Sea Level Changing Mode（SLCM） occurs mainly during La Ni？a years, with high SLA extension from west of Luzon to the eastern coast of Vietnam along the central basin of the SCS, and is likely induced by the increment of the ocean heat content. The Anticyclonic Eddy Mode（AEM） occurs mainly during El Ni？o years and appears to be triggered by the negative wind curl anomalies within the central SCS. In addition, the spring high SLA in the western SCS experienced a quasi-decadal change during 1993–2012; in other words, the AEM predominated during 1993–1998 and 2002–2005, while the La Ni？a-related SLCM prevailed during 1999–2001 and 2006–2012. Moreover, we suggest that the accelerated sea level rise in the SCS during 2005–2012 makes the SLCM the leading mode over the past two decades.

关 键 词：variability sea level anomalies spring western South China Sea 

分 类 号：P731.23[天文地球—海洋科学]