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学科主题: Oceanography
题名: Eddy heat and salt transports in the South China Sea and their seasonal modulations
作者: Chen, GX ; Gan, JP ; Xie, Q ; Chu, XQ ; Wang, DX ; Hou, YJ
通讯作者: dxwang@scsio.ac.cn
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2012
卷: 117, 页:C05021
部门归属: [Chen, Gengxin; Xie, Qiang; Chu, Xiaoqing; Wang, Dongxiao] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Gan, Jianping] Hong Kong Univ Sci & Technol, Div Environm, Hong Kong, Hong Kong, Peoples R China; [Gan, Jianping] Hong Kong Univ Sci & Technol, Dept Math, Hong Kong, Hong Kong, Peoples R China; [Xie, Qiang] Chinese Acad Sci, Sanya Inst Deep Sea Sci Engn, Sanya, Peoples R China; [Hou, Yijun] Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
项目归属: LTO
摘要: This 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.
语种: 英语
WOS记录号: WOS:000304010800004
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10167
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Recommended Citation:
Chen, GX; Gan, JP; Xie, Q; Chu, XQ; Wang, DX; Hou, YJ.Eddy heat and salt transports in the South China Sea and their seasonal modulations,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2012,117():C05021
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