Modeling the circulation in the Gulf of Tonkin, South China Sea
Modeling the circulation in the Gulf of Tonkin, South China Sea
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DOI：
10.1007/s10236-013-0636-y
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发表时间：
2013-07
期刊：
影响因子：
2.3
通讯作者：
Jingsong Gao;H. Xue;F. Chai;M. Shi
中科院分区：
文献类型：
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作者：
Jingsong Gao;H. Xue;F. Chai;M. Shi
利用普林斯顿海洋模式（Princeton Ocean Model）对北部湾（北部湾）的环流进行了研究，该模式采用了2006年和2007年的逐日表层通量和侧边界通量，以及潮汐谐波和逐月气候河流流量。在南部海湾，垂直平均环流在夏季是反气旋的，在冬季变成气旋。虽然它与当地风高度相关，但南部环流主要是由南来的南海环流驱动的。琼州海峡的气流在决定东北湾环流变率方面起着重要作用，在夏季或冬季的任何一天都可能是向东或向西的，但季节平均气流从春末到夏季是向东的，而在一年中的其余时间是向西的，年平均向西输送到海湾的量为1.01 Sv。不同的水团区分在表面与温暖和咸的南海水在南部，相对新鲜的羽状沃茨沿着北方和西部海岸的海湾，和两者之间的混合物。在较低层，模式中识别出两个冷水团，每个冷水团的T/S分布与2007年获得的观测结果在定性上相似。这两个水团在整个冬季都在产生，随着季节的推移，它们受到温跃层的保护，不受表面变暖的影响，最终在深秋消失。
The circulation in the Gulf of Tonkin (Beibu Gulf) was studied using the Princeton Ocean Model, which was forced with the daily surface and lateral boundary fluxes for 2006 and 2007, as well as tidal harmonics and monthly climatological river discharges. In the southern Gulf, the vertically averaged circulation was anti-cyclonic in summer and changed to cyclonic in winter. Although it was highly correlated with the local wind, the southern gyre was driven primarily by the South China Sea (SCS) general circulation from the south. Flows in the Qiongzhou Strait that played a significant role in determining the circulation variability in the northeastern Gulf could be eastward or westward at any given day in summer or winter, but the seasonal mean current was eastward from late spring through summer and westward during the rest of the year, with an annual mean westward transport of ∼0.1 Sv into the Gulf. Different water masses were distinguished at the surface with the warm and saline SCS water in the south, relatively fresh plume waters along the northern and western coasts of the Gulf, and the mixture of the two in between. At lower levels, two cold water masses were identified in the model, and each had T/S distributions qualitatively similar to the observations obtained in 2007. These two water masses were produced throughout the winter, sheltered from the surface warming by a thermocline as the season progressed, and eventually disappeared in late fall.