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The Casulli's difference scheme was introduced into the three dimensional ocean model in the present paper,and the wind-driven current and thermohaline current were simulated.The results show that,southwesterly monsoon in summer induces a clockwise circulation in the Beibu Gulf,and the density gradient induces an anti-clockwise one,but the density currents are more intense than the wind-driven one in summer,especially in surface layer,in addition,the northeasterly monsoon in winter induces an anti-clockwise circulation.The simulated results don't support the traditional conclusion that there is a clockwise circulation in Beibu Gulf in summer and a counter-clockwise one in winter,instead of supporting the statement that a counte-rclockwise circulation exists in the Beibu Gulfall year round.
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