Three dimensional diagnostic modeling study of the South China Sea circulation before onset of summer monsoon in 1998
Three dimensional diagnostic modeling study of the South China Sea circulation before onset of summer monsoon in 1998
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DOI：
10.1007/s10872-007-0007-8
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发表时间：
2007-02
影响因子：
2.3
通讯作者：
Yaochu Yuan;Guanghong Liao;Xiaohua Xu
中科院分区：
文献类型：
--
作者：
Yaochu Yuan;Guanghong Liao;Xiaohua Xu
利用1998年4月22日至5月24日NCEP的风场资料和水文资料，采用三维诊断模式对南海环流进行了数值模拟。利用T/P高度计的SSHA数值模拟结果表明：黑潮入侵区大部分绕流;然而，黑潮的一部分向西侵入300 m以上。这种向西侵入的气流仅限于中国南部的大陆坡，与Quet等人的研究结果一致。（2000年）的第10/2000号决议。南海北方主要为盆地尺度的气旋性涡旋，在300 m以上由C2和C3两个气旋性涡旋组成。然而，在300米以下，它被一个反气旋涡流W 4分成两部分。南海中部300 m以上的反气旋涡旋主要由W1、W2和W3三个反气旋涡旋组成。而在300 m以下则由反气旋涡W1、W2和W 4组成，并向北延伸至20°N附近。在越南沿岸300 m以上存在一个向北的沿岸急流，并比巡航2向北发展到3°15′ N左右。最重要的动力机制是斜压性和地形起伏的共同作用。第二种动力机制是风应力与地形起伏的相互作用。地形效应比β效应更重要。在SCS中不能满足Sverdrup关系。
The wind data from NCEP and hydrographic data obtained from April 22–May 24, 1998 have been used to compute the circulation in the South China Sea (SCS) using three dimensional diagnostic models. The main numerical results with SSHA derived from T/P altimeter are as follows: most of intruded Kuroshio bypasses. However, a part of Kuroshio intrudes westward above 300 m levels. This intruded westward flow is narrowly confined to the continental slope south of China, in agreement with the findings of Quet al.(2000). The basin-scale cyclonic gyre dominates in the northern SCS and consists of two cyclonic eddies, C2 and C3, above 300 m levels. However, it is separated into two parts by an anti-cyclonic eddy, W4, below 300 m. The basin-scale anti-cyclonic gyre dominates in the central SCS and consists of three anti-cyclonic eddies, W1, W2 and W3, above 300 m levels. However, below 300 m it consists of the anti-cyclonic eddies W1, W2 and W4 and extends northward to near 20°N. A northward coastal jet is present near the coast of Vietnam at depths above 300 m, and develops northward further to about a distance of 3°15′ N than that in cruise 2. The most important dynamical mechanism is due to the joint effect of the baroclinity and relief. The second dynamical mechanism is due to the interaction between the wind stress and relief. The topography effect is more important than the β effect. The Sverdrup relation cannot be satisfied in the SCS.