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Influence of the Kuroshio Intrusion on Deep Flow Intraseasonal Variability in the Northern South China Sea

Quan, Qi and Liu, Zhiqiang and Sun, Shantong and Cai, Zhongya and Yang, Yang and Jin, Guangzhen and Li, Zhibing and 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). Art. No. e2021JC017429. ISSN 2169-9275. doi:10.1029/2021jc017429. https://resolver.caltech.edu/CaltechAUTHORS:20210720-223659345

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2021jc017429DOIArticle
https://doi.org/10.6084/m9.figshare.13525838DOIMooring data
https://www.hycom.org/dataserver/gofs-3pt1/analysisRelated ItemHYCOM data
https://resources.marine.copernicus.eu/%3Foption%3Dcom_csw%26task%3DresultsRelated ItemSatellite altimeter data
ORCID:
AuthorORCID
Quan, Qi0000-0001-9566-3373
Liu, Zhiqiang0000-0002-0068-5981
Sun, Shantong0000-0002-6932-5589
Cai, Zhongya0000-0003-4733-9047
Yang, Yang0000-0002-8264-4816
Liang, X. San0000-0001-8472-3211
Additional Information:© 2021 American Geophysical Union. Issue Online: 30 June 2021; Version of Record online: 30 June 2021; Accepted manuscript online: 22 June 2021; Manuscript accepted: 20 June 2021; Manuscript revised: 25 May 2021; Manuscript received: 31 March 2021. This study is supported by the National Natural Science Foundation of China (42006007; 41906016; 42006009; 41806023; 41975064), the China Postdoctoral Science Foundation (2020M682767; 2020M681269), the Science and Technology Development Fund, Macau SAR (SKL-IOTSC-2021-2023), the Natural Science Foundation of Guangdong Province (2019A1515011487), and the Fundamental Research Funds for the Central Universities (20184200031610059). The authors appreciate three anonymous reviewers for their insightful comments and Dr. Yukun Qian for discussions that improve this manuscript. Data Availability Statement: The mooring data are available at https://doi.org/10.6084/m9.figshare.13525838. The HYCOM data can be accessed from https://www.hycom.org/dataserver/gofs-3pt1/analysis. The satellite altimeter data were downloaded from https://resources.marine.copernicus.eu/?option=com_csw&task=results.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China42006007
National Natural Science Foundation of China41906016
National Natural Science Foundation of China42006009
National Natural Science Foundation of China41806023
National Natural Science Foundation of China41975064
China Postdoctoral Science Foundation2020M682767
China Postdoctoral Science Foundation2020M681269
Science and Technology Development FundSKL-IOTSC-2021-2023
Natural Science Foundation of Guangdong Province2019A1515011487
Fundamental Research Funds for the Central Universities20184200031610059
Subject Keywords:South China Sea; Kuroshio; topographic Rossby wave; energy; eddy; deep flow
Issue or Number:7
DOI:10.1029/2021jc017429
Record Number:CaltechAUTHORS:20210720-223659345
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210720-223659345
Official Citation:Quan, Q., Liu, Z., Sun, S., Cai, Z., Yang, Y., Jin, G., et al. (2021). Influence of the Kuroshio intrusion on deep flow intraseasonal variability in the northern South China Sea. Journal of Geophysical Research: Oceans, 126, e2021JC017429. https://doi.org/10.1029/2021JC017429
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109944
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Jul 2021 16:10
Last Modified:21 Jul 2021 16:10

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