Seasonal variability of the isopycnal surface circulation in the South China Sea derived from a variable-grid global ocean circulation model

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• 作者：Zexun Wei ; Guohong Fang ; Tengfei Xu ; Yonggang Wang ; Zhan Lian
• 关键词：South China Sea ; isopycnal surface circulation ; ocean general circulation model ; Luzon Strait transport
• 刊名：Acta Oceanologica Sinica
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：35
• 期：1
• 页码：11-20
• 全文大小：1,143 KB
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• 作者单位：Zexun Wei (1) (2) (3)
  Guohong Fang (1) (2) (3)
  Tengfei Xu (1) (2) (3)
  Yonggang Wang (1) (2) (3)
  Zhan Lian (1) (2) (3)
  
  1. First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China
  2. Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China
  3. Key Lab of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao, 266061, China
  
• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1099

文摘

In this study, we develop a variable-grid global ocean general circulation model (OGCM) with a fine grid (1/6)° covering the area from 20°S–50°N and from 99°–150°E, and use the model to investigate the isopycnal surface circulation in the South China Sea (SCS). The simulated results show four layer structures in vertical: the surface and subsurface circulation of the SCS are characterized by the monsoon driven circulation, with basin-scaled cyclonic gyre in winter and anti-cyclonic gyre in summer. The intermediate layer circulation is opposite to the upper layer, showing anti-cyclonic gyre in winter but cyclonic gyre in summer. The circulation in the deep layer is much weaker in spring and summer, with the maximum velocity speed below 0.6 cm/s. In fall and winter, the SCS deep layer circulation shows strong east boundary current along the west coast of Philippine with the velocity speed at 1.5 m/s, which flows southward in fall and northward in winter. The results have also revealed a fourlayer vertical structure of water exchange through the Luzon Strait. The dynamics of the intermediate and deep circulation are attributed to the monsoon driving and the Luzon Strait transport forcing. Key words South China Sea isopycnal surface circulation ocean general circulation model Luzon Strait transport