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Progress on the formation dynamics of the layered circulation in the South China Sea
Cai, Zhongya1; Gan, Jianping1; Liu, Zhiqiang2; Hui, Chiwing Rex1; Li, Junlu1
2020-02-01
Source PublicationProgress in Oceanography
ISSN0079-6611
Volume181
Abstract

In the South China Sea (SCS), an alternating cyclonic-anticyclonic-cyclonic (CAC) circulation is recognized in the upper-middle-deep layers based on the principle of Stokes theorem. The CAC circulation is driven extrinsically by the East Asia monsoonal winds, a vertical sandwich-like inflow-outflow-inflow through Luzon Strait (LS) and intrinsically by the slope current-topography interaction. The understandings on the formation mechanisms of CAC circulation have been achieved based on different principles, and the physically solid interpretation on the CAC circulation need to be further clarified. In this paper, we review different dynamic perspectives from recent researches that describe the combined effects of surface wind forcing, lateral external forcing, and the intrinsic coupling among different layers. Our aim is to obtain a consistent understanding of the dynamics of the circulation in the SCS. The CAC circulation forms largely from the planetary vorticity flux that is extrinsically induced by the inflow-outflow-inflow through LS, which is predominantly balanced by the interaction between the CAC flow and bottom topography. Inside basin, the vertical motion dynamically links the circulation in three layers, and its spatial pattern has a strong impact on the basin circulation, particularly in the middle and deep layers. Vertical coupling of the layers occurs mainly over the slope because of the cross-slope motion due to interaction between strong slope current and topography. The internal layered circulation and intensified mixing, in turn, affect and maintain the layered current structure in LS. Based on the review of the forcing mechanisms, we offer perspectives for further investigations.

KeywordExternal Vorticity Flux Formation Dynamics Intrinsic Coupling South China Sea Layered Circulation Stokes Theorem
DOI10.1016/j.pocean.2019.102246
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaOceanography
WOS IDWOS:000512481200006
Scopus ID2-s2.0-85076841640
Fulltext Access
FWCI1.0905067
Citation statistics
Document TypeJournal article
CollectionPersonal research not belonging to the institution
Corresponding AuthorGan, Jianping
Affiliation1.Department of Mathematics and Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong, Hong Kong
2.Southern University of Science and Technology, Shenzhen, China
Recommended Citation
GB/T 7714
Cai, Zhongya,Gan, Jianping,Liu, Zhiqiang,et al. Progress on the formation dynamics of the layered circulation in the South China Sea[J]. Progress in Oceanography,2020,181.
APA Cai, Zhongya,Gan, Jianping,Liu, Zhiqiang,Hui, Chiwing Rex,&Li, Junlu.(2020).Progress on the formation dynamics of the layered circulation in the South China Sea.Progress in Oceanography,181.
MLA Cai, Zhongya,et al."Progress on the formation dynamics of the layered circulation in the South China Sea".Progress in Oceanography 181(2020).
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