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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摘要: 本研究建立了一个变网格全球大洋环流数值模式,其分辨率在20°S-50°N和99°-150°E之间为(1/6)°。我们利用该模式对南海等密度面环流进行了分析。模拟结果显示,南海等密度面环流可以分为4层。表层和次表层环流由季风驱动,在冬季为海盆尺度的气旋式环流控制,而夏季为反气旋式环流控制。南海中层环流形态与上层正好相反,冬季为海盆尺度的反气旋式环流,而夏季为气旋式环流。南海深层环流在春季和夏季较弱,最大流速不超过0.6 cm/s;在秋季和冬季,南海深层环流形态主要表现为菲律宾西岸存在较强的东边界流,其流速超过1.5 cm/s,且秋季流向向南,冬季向北。数值模拟结果还显示,吕宋海峡水交换也呈垂向4层的分层结构。吕宋海峡海水入侵和季风是驱动南海中深层环流的主要因素。Abstract: 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.
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