| WEI Zexun,FANG Guohong,XU Tengfei,WANG Yonggang,LIAN Zhan. 2016. Seasonal variability of the isopycnal surface circulation in the South China Sea derived from a variable-grid global ocean circulation model. Acta Oceanologica Sinica, 35(1):11－20 |
| Seasonal variability of the isopycnal surface circulation in the South China Sea derived from a variable-grid global ocean circulation model |
| 南海等密度面环流季节变化的数值模拟研究 |
| Received:March 19, 2015 Revised:September 08, 2015 |
| DOI：10.1007/s13131-016-0791-3 |
| Key words:South China Sea isopycnal surface circulation ocean general circulation model Luzon Strait transport |
| 中文关键词: 南海 等密度面环流 大洋环流模式 吕宋海峡输运 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | WEI Zexun | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
Key Lab of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061, China | weizx@fio.org.cn | | FANG Guohong | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
Key Lab of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061, China | | | XU Tengfei | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
Key Lab of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061, China | | | WANG Yonggang | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
Key Lab of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061, China | | | LIAN Zhan | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
Key Lab of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061, China | |
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| 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. |
| 中文摘要: |
| 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。 |
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