Bidirectional Volume Exchange Between Kuroshio and East China Sea Shelf Water Based on a Whole-Region Passive-Tracing Method

doi:10.1029/2019JC015528

IOCAS-IR > 海洋环流与波动重点实验室

	Bidirectional Volume Exchange Between Kuroshio and East China Sea Shelf Water Based on a Whole-Region Passive-Tracing Method
	Hu, Fang1 ; Liu, Yahao 2; Xu, Zhenhua 3; Yin, Yuqi 3; Hou, Yijun 3
	2020-05-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	125 期号:5 页码:21
通讯作者	Liu, Yahao([email protected]) ; Hou, Yijun([email protected])
摘要	The Kuroshio intrusion has a profound influence on the marine dynamic and ecological environment in the East China Sea (ECS) shelf. In most previous studies, the intrusion has been evaluated by the volume transport across the 200 m isobath. However, this approximate substitution leads to an underestimation of the Kuroshio intruding flux as it fails to separate the onshore and offshore transport of Kuroshio and shelf water. In this paper, a whole-region passive-tracing modeling method is proposed to quantitatively explore the bidirectional exchange of Kuroshio and shelf water, by introducing the Kuroshio water concentration as a passive tracer into the flux calculations. In terms of the climatological annual mean, the Kuroshio intrusion onto the ECS shelf is as high as 1.85 Sv (1 Sv = 10(6) m(3) s(-1)), with a shelf water outflow rate of 0.42 Sv. The real Kuroshio intruding flux is about 30% higher than the net volume transport across the 200 m isobath (1.43 Sv), which indicates that the influence of the Kuroshio intrusion on the ECS may be far greater than believed before. The volume exchange on the inner shelf of the ECS is also discussed. Analyses of the momentum balances indicate that the exchanges on both the shelf break and the inner shelf are generally dominated by the geostrophic balance, but the exchange on the shelf break is more susceptible to nonlinear effects. The results of a set of sensitivity experiments show that variation of the Kuroshio intrusion is mainly regulated by the combined effect of the Kuroshio transport, the Taiwan Strait current, and the local wind stress. In contrast, the local wind stress has a predominant effect on the outflow of shelf water. Plain Language Summary In this paper, the intruding flux of the Kuroshio water onto the East China Sea shelf is separated from the total cross-shelf break transport and calculated with a whole-region passive-tracing method, revealing a quantity that is approximately 31% higher than those of the traditional net cross-shelf break transport methods. The results of sensitivity experiments show that the variation of the Kuroshio intrusion is mainly regulated by the combined effect of the Kuroshio transport, the Taiwan Strait current, and the local wind stress. In contrast, the local wind stress has a predominant effect on the outflow of shelf water. Key Points A whole-region passive-tracing method is established for calculating the volume flux of water exchange Bidirectional volume exchange between Kuroshio and East China Sea shelf water are quantified separately Key factors affecting Kuroshio and shelf water exchanges are studied through a set of sensitivity experiments
关键词	East China Sea Kuroshio intrusion transport whole-region passive-tracing method
DOI	10.1029/2019JC015528
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41630967]; National Natural Science Foundation of China[41776020]; National Natural Science Foundation of China[41476018]; National Natural Science Foundation of China[91858103]; National Program on Global Change and Air-Sea Interaction[GASI-IPOVAI-01-06]; Strategic Pioneering Research Program of CAS[XDA11010204]; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606402]; NSFC Innovative Group Grant[41421005]; High Performance Computing Center at the IOCAS
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000548601000009
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：12[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/337002/167961
专题	海洋环流与波动重点实验室
通讯作者	Liu, Yahao; Hou, Yijun
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Laboratary Ocean Circulat & Waves, CAS, Qingdao, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Hu, Fang,Liu, Yahao,Xu, Zhenhua,et al. Bidirectional Volume Exchange Between Kuroshio and East China Sea Shelf Water Based on a Whole-Region Passive-Tracing Method[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2020,125(5):21.
APA	Hu, Fang,Liu, Yahao,Xu, Zhenhua,Yin, Yuqi,&Hou, Yijun.(2020).Bidirectional Volume Exchange Between Kuroshio and East China Sea Shelf Water Based on a Whole-Region Passive-Tracing Method.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,125(5),21.
MLA	Hu, Fang,et al."Bidirectional Volume Exchange Between Kuroshio and East China Sea Shelf Water Based on a Whole-Region Passive-Tracing Method".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 125.5(2020):21.

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