Three dimensional diagnostic study of the circulation in the South China Sea during winter 1998
Three dimensional diagnostic study of the circulation in the South China Sea during winter 1998
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DOI：
10.1007/s10872-008-0067-4
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发表时间：
2008-09
影响因子：
2.3
通讯作者：
Guanghong Liao;Yaochu Yuan;Xiaohua Xu
中科院分区：
文献类型：
--
作者：
Guanghong Liao;Yaochu Yuan;Xiaohua Xu
根据1998年11月28日至12月27日的水文资料，采用三维诊断模式计算了南海环流的三维结构。海表高度异常与数值结果的结合为南海提供了一个一致的环流型，其主要环流特征可以概括为：南海北部在吕宋岛西北部有一个C1-1和C1-2两个核的冷气旋环流C1，在东沙群岛附近有一个反气旋涡旋（W1）。在南海中部，越南以东有一个较强的气旋环流C2，有C2-1和C2-2两个核，在巴拉望岛西北部有一个较弱的反气旋涡W2。一股较强的沿海南向急流出现在涡旋C2以西，在涡旋C2-2西南地区转向东南，在涡旋C2-2以南地区转向东流。在南海南部，婆罗洲西北部有一个弱气旋涡旋C3，次表层有一个反气旋环流W3。从18.975°到21.725°N，经119.125°E的CD剖面向西输送的净体积在400 m以上层约为10.3 × 106m3s−1。南海环流形成的最重要动力机制是斜压和起伏的共同作用，其次是风应力和起伏的相互作用。强烈的上升流发生在吕宋岛西北部。
On the basis of hydrographic data obtained from 28 November to 27 December, 1998, the three-dimensional structure of circulation in the South China Sea (SCS) is computed using a three-dimensional diagnostic model. The combination of sea surface height anomaly from altimeter data and numerical results provides a consistent circulation pattern for the SCS, and main circulation features can be summarized as follows: in the northern SCS there are a cold and cyclonic circulation C1 with two cores C1-1 and C1-2 northwest of Luzon and an anticyclonic eddy (W1) near Dongsha Islands. In the central SCS there is a stronger cyclonic circulation C2 with two cores C2-1 and C2-2 east of Vietnam and a weaker anticyclonic eddy W2 northwest of Palawan Island. A stronger coastal southward jet presents west of the eddy C2 and turns to the southeast in the region southwest of eddy C2-2, and it then turns to flow eastward in the region south of eddy C2-2. In the southern SCS there are a weak cyclonic eddy C3 northwest of Borneo and an anti-cyclonic circulation W3 in the subsurface layer. The net westward volume transport through section CD at 119.125°E from 18.975° to 21.725°N is about 10.3 × 106m3s−1in the layer above 400 m level. The most important dynamic mechanism generating the circulation in the SCS is a joint effect of the baroclinicity and relief (JEBAR), and the second dynamical mechanism is an interaction between the wind stress and relief (IBWSR). The strong upwelling occurs off northwest Luzon.