The Kuroshio near the Luzon Strait and circulation in the northern South China Sea during August and September 1994
The Kuroshio near the Luzon Strait and circulation in the northern South China Sea during August and September 1994
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DOI：
10.1007/s10872-008-0065-6
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发表时间：
2008-09
影响因子：
2.3
通讯作者：
Yaochu Yuan;Guanghong Liao;Chenghao Yang
中科院分区：
文献类型：
--
作者：
Yaochu Yuan;Guanghong Liao;Chenghao Yang
利用1994年8月28日至9月10日的NCEP风场资料和水文资料，采用改进的反演方法，利用三维诊断模式计算了南海北方和吕宋海峡附近的环流。数值结果如下：黑潮主体位于台湾东岸附近400 m以上，距台湾东岸800 m以上，在吕宋海峡附近400 m以上有一股黑潮分支与一股北向流汇合，该股北向流来自吕宋西海岸以西，向西北方向侵入，然后在20°30′ N附近分支为西部和东部。东部向北流入台湾以东地区，而西部继续向西北侵入，流经台湾西南部地区。在400 m以上的层中，通过121°00′ E断面AB从19°00′ N到21° 43′ N的净向西侵入体积输送约为3.5 × 106 m3 s-1。东沙群岛以东700 m以上和东部200 m以下分别存在反气旋涡旋W1和W3。中部环流主要由一个海盆尺度的气旋性涡旋控制，并由三个气旋性涡旋组成。中部地区有较强的上升流。斜压性和地形起伏的联合作用以及风应力和地形起伏之间的相互作用对于真实的强迫穿过H-1等高线的气流影响环流型都是重要的。
Wind data from NCEP and hydrographic data obtained from August 28 to September 10, 1994 have been used to compute circulation in the northern South China Sea and near Luzon Strait using three-dimensional diagnostic models with a modified inverse method. The numerical results are as follows: the main Kuroshio is located above 400 m levels near Taiwan’s eastern coast and above 800 m levels away from it. Near Luzon Strait above 400 m levels a branch of the Kuroshio joins with a part of the northward current, which comes from an area west of Luzon’s western coast and intrudes northwestward, then it branchs into western and eastern parts near 20°30′ N. The eastern part flows northward into an area east of Taiwan, while its western part continues to intrude northwestward, flowing through an area southwest of Taiwan. Net westward intruded volume transport through longitude Section AB at 121°00′ E from 19°00′ N to 21° 43′ N is about 3.5 × 106m3s−1in a layer above 400 m levels. The anticyclonic eddies W1 and W3 exist above 700 m levels east of Dongsha Islands and below 200 m levels in the eastern part of the region, respectively. The circulation in the middle region is dominated mainly by a basin-scale cyclonic gyre, and consists of three cyclonic eddies. Strong upwelling occurs in the middle region. The joint effect of baroclinity and relief and interaction between wind stress and relief both are important for real forcing of flow across contours offH−1in effecting the circulation pattern.