Numerical study of seasonal circulation and variability over the inner shelf of the northern South China Sea

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• 作者：Xiaomei Ji ; Jinyu Sheng ; Jinhai Zheng ; Wei Zhang
• 关键词：The northern South China Sea ; Monthly mean circulation ; Tidal and residual currents ; Wind ; driven currents ; Baroclinic and barotropic currents
• 刊名：Ocean Dynamics
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：65
• 期：8
• 页码：1103-1120
• 全文大小：13,314 KB
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• 作者单位：Xiaomei Ji (1)
  Jinyu Sheng (1) (2)
  Jinhai Zheng (1)
  Wei Zhang (1)
  
  1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China
  2. Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 4J1
  
• 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

This study examines seasonal circulation, hydrography, and associated spatial variability over the inner shelf of the northern South China Sea (NSCS) using a nested-grid coastal ocean circulation model. The model external forcing consists of tides, atmospheric forcing, and open boundary conditions based on the global ocean circulation and hydrography reanalysis produced by the Hybrid Coordinate Ocean model. Five numerical experiments are conducted with different combinations of external forcing functions to examine main physical processes affecting the seasonal circulation in the study region. Model results demonstrate that the monthly mean circulation in the study region features the Guangdong Coastal Current (GCC) over coastal waters and the South China Sea Warm Current (SCSWC) in the offshore deep waters. The GCC produced by the model flows nearly southwestward in winter months and northwestward in summer months, which agrees with previous studies. The SCSWC flows roughly northeastward and is well defined in summer months. In winter months, by comparison, the SCSWC is superseded by the southwestward strong wind-driven currents. Analysis of model results in five different experiments demonstrates that the monthly mean circulation over coastal and inner shelf waters of the NSCS can be approximated by barotropic currents forced by the southwestward monsoon winds in winter months. In summer months, by comparison, the monthly mean circulation in the study region is affected significantly by baroclinic dynamics associated with freshwater runoff from the Pearl River and advection of warm and saline waters carried by the SCSWC over the NSCS.