Eddy heat and salt transports in the South China Sea and their seasonal modulations

doi:10.1029/2011JC007724

IOCAS-IR > 海洋环流与波动重点实验室

	Eddy heat and salt transports in the South China Sea and their seasonal modulations
	Chen, Gengxin 1; Gan, Jianping 2,3; Xie, Qiang 1,4; Chu, Xiaoqing 1; Wang, Dongxiao 1; Hou, Yijun 5; Wang, DX (reprint author), Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, 164 W Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
	2012-05-12
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	0148-0227
卷号	117 页码:C05021
文章类型	Article
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.
关键词	Upper-layer Circulation North Pacific Anticyclonic Eddies Ocean Variability Boundary Summer Warm
学科领域	Oceanography
DOI	10.1029/2011JC007724
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000304010800004
引用统计	被引频次：119[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/12139
专题	海洋环流与波动重点实验室
通讯作者	Wang, DX (reprint author), Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, 164 W Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
作者单位	1.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
第一作者单位	中国科学院海洋研究所
推荐引用方式 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:C05021.
APA	Chen, Gengxin.,Gan, Jianping.,Xie, Qiang.,Chu, Xiaoqing.,Wang, Dongxiao.,...&Wang, DX .(2012).Eddy heat and salt transports in the South China Sea and their seasonal modulations.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,117,C05021.
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):C05021.

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