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Influence of the Kuroshio Intrusion on Deep Flow Intraseasonal Variability in the Northern South China Sea
Quan, Qi1; Liu, Zhiqiang1; Sun, Shantong2; Cai, Zhongya3,4; Yang, Yang5; Jin, Guangzhen6; Li, Zhibing1; Liang, X. San5
2021-07-01
Source PublicationJournal of Geophysical Research: Oceans
ISSN2169-9275
Volume126Issue:7
Abstract

Interactions between the open ocean and marginal seas have been suggested to be critical to the redistribution and dissipation of global energy. Here, we propose a mechanism for the upper open ocean influencing the deep flow in marginal seas that hinges on the formation and propagation of topographic Rossby waves (TRWs). Observations and high-resolution simulations suggest substantial intraseasonal variability with periods of 5–60 days associated with the deep flow over continental slopes of the northern South China Sea (NSCS). These fluctuations generally account for over 40% of the total deep kinetic energy variability and the number can reach 70% over the slopes to the west of the Luzon Strait, southwest of the Dongsha Islands, and northeast of the Xisha Islands. By examining the spatiotemporal features of the fluctuations, we demonstrate that the intraseasonal variability of the deep flow in the NSCS is closely associated with TRWs. Using a recently developed multiscale energetics analysis in combination with a ray tracing model, we show that the energy sources of TRWs can be traced back to the east of the Dongsha Islands, where the Kuroshio intrusion and related eddies energize the TRWs primarily through pressure work. These waves propagate westward across the NSCS and drive the intraseasonal variability of the deep flow over continental slopes. Our findings highlight an energy pathway from the open ocean western boundary current to the abyssal marginal sea that could modulate regional circulation as well as exchanges between major ocean basins.

KeywordDeep Flow Eddy Energy Kuroshio South China Sea Topographic Rossby Wave
DOI10.1029/2021JC017429
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000681412200019
Scopus ID2-s2.0-85112016752
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Cited Times [WOS]:5   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionTHE STATE KEY LABORATORY OF INTERNET OF THINGS FOR SMART CITY (UNIVERSITY OF MACAU)
Corresponding AuthorLiu, Zhiqiang
Affiliation1.Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China
2.Environmental Science and Engineering, California Institute of Technology, Pasadena, United States
3.State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering, University of Macau, Macao
4.Center for Ocean Research in Hongkong and Macau, Macao
5.School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China
6.College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, China
Recommended Citation
GB/T 7714
Quan, Qi,Liu, Zhiqiang,Sun, Shantong,et al. Influence of the Kuroshio Intrusion on Deep Flow Intraseasonal Variability in the Northern South China Sea[J]. Journal of Geophysical Research: Oceans,2021,126(7).
APA Quan, Qi,Liu, Zhiqiang,Sun, Shantong,Cai, Zhongya,Yang, Yang,Jin, Guangzhen,Li, Zhibing,&Liang, X. San.(2021).Influence of the Kuroshio Intrusion on Deep Flow Intraseasonal Variability in the Northern South China Sea.Journal of Geophysical Research: Oceans,126(7).
MLA Quan, Qi,et al."Influence of the Kuroshio Intrusion on Deep Flow Intraseasonal Variability in the Northern South China Sea".Journal of Geophysical Research: Oceans 126.7(2021).
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