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Dynamics of the layered circulation inferred from kinetic energy pathway in the south China sea
Cai, Zhongya1,2; Gan, Jianping1
2021-05-01
Source PublicationJOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN0022-3670
Volume51Issue:5Pages:1671-1685
Abstract

We investigated the mean kinetic energy (MKE) and eddy kinetic energy (EKE) in the South China Sea to illustrate the dynamics of the vertically rotating cyclonic–anticyclonic–cyclonic (CAC) circulation in the upper, middle, and deep layers. We found that strong MKE along the basin slope and the associated EKE arising from the vertical shear and stratification of the mean current characterize the circulation. In the upper layer, the external MKE input from the Kuroshio intrusion and wind forcing drive the cyclonic circulation, with the wind forcing providing most of the EKE. External forcing, however, does not directly provide the MKE and EKE of the CAC circulation in the semi-enclosed middle and deep layers, where the internal pressure work near Luzon Strait and the vertical buoyancy flux (VBF) in the southern basin and along the western slope maintain the MKE and EKE. The internal pressure work is formed by ageostrophic motion and pressure gradient field associated with circulation. The VBF is generated by vertical motion induced by the geostrophic cross-isobath transport along the slope where variable density field is maintained by the external flow and the internal mixing. The kinetic energy pathway in the CAC circulation indicates that the external forcing dominates upper-layer circulation and the coupling between internal and external dynamics is crucial for maintaining the circulation in the middle and deep layers. This study provides a new interpretation to the maintenance of CAC circulation from energy prospect.

KeywordAgeostrophic Circulations Kinetic Energy Ocean Circulation Ocean Dynamics Pressure
DOI10.1175/JPO-D-20-0226.1
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000655510400018
PublisherAMER METEOROLOGICAL SOC45 BEACON ST, BOSTON, MA 02108-3693
Scopus ID2-s2.0-85106451192
Fulltext Access
FWCI1.5082029
Citation statistics
Document TypeJournal article
CollectionFaculty of Science and Technology
THE STATE KEY LABORATORY OF INTERNET OF THINGS FOR SMART CITY (UNIVERSITY OF MACAU)
DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorGan, Jianping
Affiliation1.Center for Ocean Research in Hong Kong and Macau, Department of Ocean Science and Department of Mathematics, Hong Kong University of Science and Technology, Hong Kong
2.State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering, University of Macau, Macao
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Cai, Zhongya,Gan, Jianping. Dynamics of the layered circulation inferred from kinetic energy pathway in the south China sea[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2021,51(5):1671-1685.
APA Cai, Zhongya,&Gan, Jianping.(2021).Dynamics of the layered circulation inferred from kinetic energy pathway in the south China sea.JOURNAL OF PHYSICAL OCEANOGRAPHY,51(5),1671-1685.
MLA Cai, Zhongya,et al."Dynamics of the layered circulation inferred from kinetic energy pathway in the south China sea".JOURNAL OF PHYSICAL OCEANOGRAPHY 51.5(2021):1671-1685.
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