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Eddy heat and salt transports in the South China Sea and their seasonal modulations
Chen, Gengxin1; Gan, Jianping2,3; Xie, Qiang1,4; Chu, Xiaoqing1; Wang, Dongxiao1; Hou, Yijun5
2012-05-12
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume117
AbstractThis study describes characteristics of eddy (turbulent) heat and salt transports, in the basin-scale circulation as well as in the embedded mesoscale eddy found in the South China Sea (SCS). We first showed the features of turbulent heat and salt transports in mesoscale eddies using sea level anomaly (SLA) data, in situ hydrographic data, and 375 Argo profiles. We found that the transports were horizontally variable due to asymmetric distributions of temperature and salinity anomalies and that they were vertically correlated with the thermocline and halocline depths in the eddies. An existing barrier layer caused the halocline and eddy salt transport to be relatively shallow. We then analyzed the transports in the basin-scale circulation using an eddy diffusivity method and the sea surface height data, the Argo profiles, and the climatological hydrographic data. We found that relatively large poleward eddy heat transports occurred to the east of Vietnam (EOV) in summer and to the west of the Luzon Islands (WOL) in winter, while a large equatorward heat transport was located to the west of the Luzon Strait (WLS) in winter. The eddy salt transports were mostly similar to the heat transports but in the equatorward direction due to the fact that the mean salinity in the upper layer in the SCS tended to decrease toward the equator. Using a 21/2-layer reduced-gravity model, we conducted a baroclinic instability study and showed that the baroclinic instability was critical to the seasonal variation of eddy kinetic energy (EKE) and thus the eddy transports. EOV, WLS, and WOL were regions with strong baroclinic instability, and, thus, with intensified eddy transports in the SCS. The combined effects of vertical velocity shear, latitude, and stratification determined the intensity of the baroclinic instability, which intensified the eddy transports EOV during summer and WLS and WOL during winter.
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1029/2011JC007724
Indexed BySCI
Language英语
WOS KeywordUPPER-LAYER CIRCULATION ; NORTH PACIFIC ; ANTICYCLONIC EDDIES ; OCEAN ; VARIABILITY ; BOUNDARY ; SUMMER ; WARM
WOS SubjectOceanography
WOS IDWOS:000304010800004
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/749
Collection深海科学研究部_海洋环流观测与数值模拟研究室
Affiliation1.Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
2.Hong Kong Univ Sci & Technol, Div Environm, Hong Kong, Hong Kong, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Math, Hong Kong, Hong Kong, Peoples R China
4.Chinese Acad Sci, Sanya Inst Deep Sea Sci Engn, Sanya, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
Recommended Citation
GB/T 7714
Chen, Gengxin,Gan, Jianping,Xie, Qiang,et al. Eddy heat and salt transports in the South China Sea and their seasonal modulations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2012,117.
APA Chen, Gengxin,Gan, Jianping,Xie, Qiang,Chu, Xiaoqing,Wang, Dongxiao,&Hou, Yijun.(2012).Eddy heat and salt transports in the South China Sea and their seasonal modulations.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,117.
MLA Chen, Gengxin,et al."Eddy heat and salt transports in the South China Sea and their seasonal modulations".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 117(2012).
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