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Three dimensional diagnostic modeling study of the South China Sea circulation before onset of summer monsoon in 1998

机译:1998年夏季风爆发前南海环流的三维诊断建模研究

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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 Qu et 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.
机译:来自NCEP的风数据和1998年4月22日至5月24日获得的水文数据已用于使用三维诊断模型来计算南中国海(SCS)的环流。从T / P高度计得出的SSHA的主要数值结果如下:大多数侵入的黑潮绕过。但是,黑潮的一部分向西侵入300 m以上的水平面。与Qu等人的发现一致,这种侵入的西流被狭窄地限制在中国南部的大陆斜坡上。 (2000)。盆地规模的旋风回旋在南海北部占主导地位,由两个旋风涡旋C2和C3组成,高度在300 m以上。但是,它被300 m以下的反气旋涡W4分为两部分。盆地规模的反气旋回旋在南海中部占主导地位,由三个反气旋涡W1,W2和W3组成,高度在300 m以上。但是,在300 m以下,它由反气旋涡W1,W2和W4组成,向北延伸至20°N附近。在越南海岸附近,深度超过300 m的地方有一个向北的沿海喷气流,它比巡航2向北发展到大约3°15′N。最重要的动力机制是由于斜度和救济。第二种动力机制是由于风应力和释放之间的相互作用。地形效应比β效应更重要。 SCS中不能满足Sverdrup关系。

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