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利用美国普林斯顿大学海洋模式(POM)对风应力和海岸线共同作用下的南海冷暖涡生成机制进行了数值模拟。结果表明,风应力的作用总可在其下方的海洋中激发出与风应力旋转方向相同的直接涡旋。当地球自转参数f≠0时,通过埃克曼( Ekman)抽吸作用可在南海分别产生与反气旋性和气旋性海面风应力强迫相对应的暖涡和冷涡。如果f=0,风应力激发出的直接涡旋流更强,但均为冷性涡旋。β效应使激发出的海洋涡旋东西方向的非对称性增大,并且诱生出一个与直接涡旋反向的间接涡旋,两涡间的海流和海洋西边界流均增强。文中还对上述现象的机理进行了简要讨论。
The mechanism of the warm and cold vortex formation in the South China Sea is simulated by the POM of the United States on the wind stress and the coastline. The results show that the effect of wind stress always excites the direct vortex in the ocean under it with the same direction of wind stress rotation. When the earth rotation parameter f ≠ 0, Ekman aspiration can generate warm and cold vortices respectively in the South China Sea corresponding to the anti-cyclonic and cyclonic sea surface wind stress. If f = 0, the direct eddy flow excited by wind stress is stronger, but both are cold vortex. The β effect increases the east-west asymmetry of the excited ocean vortex and induces an indirect vortex reversing the direct vortex. The currents between the two vortices and the oceanic western boundary flow are enhanced. The article also briefly discussed the mechanism of the above phenomenon.