A numerical study on the formation and variation of a clockwise-circulation during winter in the Yellow Sea |
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| Authors: | Satoru Takahashi Yutaka Isoda Tetsuo Yanagi |
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| Institution: | (1) Department of Civil and Ocean Engineering, Ehime University, 790 Matuyama, Japan;(2) Present address: Faculty of Fisheries, Hokkaido University, 3-1-1 Minato, 041 Hakodate, Japan |
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| Abstract: | In the Yellow Sea, the north-westerly wind dominates in winter and the existence of horizontal clockwise circulation has been suggested (Yanagi and Takahashi, 1993). The formation and variation mechanisms of this clockwise circulation is investigated using the wind forced numerical model which has a simplified basin configuration of the Yellow Sea. The model results show that two vortices (an anticlockwise vortex off Chinese coast and a clockwise vortex off Korean coast) are generated by the uniform north-westerly wind. Both vortices propagate along the shelf slope as the first mode shelf waves. An anti-clockwise vortex can not grow because it does not balance to the wind forcing. On the other hand, a clockwise vortex can grow and it reaches to the equilibrium condition at the northern part of the Yellow Sea, because this circulation can balance to the wind forcing. The time scale to become into the equilibrium condition is about 2 days. From this fact, it is ascertained that a clockwise circulation in the basin is generated periodically according to the variable wind forcing with 4 days period. The steady part of the current field exists with the fluctuating one which is induced by the periodical north-westerly wind. |
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