Low-frequency variability of a semi-closed sea induced by the circulation in an adjacent ocean in a wind-driven, quasi-geostrophic, eddy-resolving simulation

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• 作者：Lin Mu (1) moulin1977@hotmail.com
  Linhao Zhong (2) zlh@mail.iap.ac.cn
  Lijuan Hua (3) hualj@gucas.ac.cn
  Jun Song (1) thunder098@hotmail.com
• 关键词：Low ; frequency variability – ; The South China Sea – ; The west boundary current – ; Mesoscale eddy forcing
• 刊名：Ocean Dynamics
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：61
• 期：10
• 页码：1459-1473
• 全文大小：9.2 MB
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• 作者单位：1. National Marine Data and Information Service, Tianjin, 300171 China2. Laboratory of Cloud-Precipitation Physcics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029 China3. Graduate University of Chinese Academy of Sciences, Beijing, 100049 China
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Geophysics and Geodesy
  Meteorology and Climatology
  Fluids
  Structural Foundations and Hydraulic Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1616-7228

文摘

The wind-driven circulation in the northwestern Pacific and the South China Sea (SCS) is simplified as a two-layer, quasi-geostrophic model in two rectangular basins connected by an idealized strait. This model is used to investigate the impact of the western boundary current (WBC) on the adjacent marginal sea. The variability of the circulation in the two basins is investigated with a high resolution and at low viscosity, which allows the numerical solution to resolve mesoscale eddy forcing. The model ocean is driven by the time-independent asymmetric wind stress acting on the idealized Pacific (large basin) only. Under the reference parameters used in this study, the WBC can intrude into the idealized SCS (small basin) in the form of a loop current, shedding eddies regularly. The rate of eddy shedding is nearly constant throughout the entire integration time of the model; however, the intensity of the eddy-shedding exhibits multiple timescale variability ranging from quasi-biennial to decadal timescale. A set of sensitivity experiments demonstrate that our results are robust against changes to model parameters and geometry. Multivariate spectral analysis is used to extract the spatiotemporal feature of the variability. Joint analysis for the two basins shows that the circulation in the idealized SCS is significantly impacted by the variability at decadal (15-year), interannual (5–7-year and quasi-biennial), and quasi-annual timescales. The spatial structures of the modes of variablility suggest that the variance in position of the WBC, combined with mesoscale activity, act to influence the low-frequency modes of the idealized SCS. The structural differences between the modes strongly impacting the idealized SCS and those having weak influence are also presented.