The Kuroshio near the Luzon Strait and circulation in the northern South China Sea during August and September 1994 |
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| Authors: | Yaochu Yuan Guanghong Liao Chenghao Yang |
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| Institution: | (1) State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, P.R. China |
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| Abstract: | 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 × 106 m3s−1 in 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 of fH
−1 in effecting the circulation pattern. |
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| Keywords: | Intrusion of a branch of Kuroshio into the SCS three-dimensional diagnostic modeling modified inverse method cyclonic and anticyclonic eddies basin-scale cyclonic gyre real forcing of flow across contours of fH − 1 |
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