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本文应用二维正压模式模拟冬季黄,东海的陆架陷波与环流,模式考虑了方程中所有项,数值模式采用显式的二次守恒格式,其优点在于能够抑制非线性不稳定性。 计算结果表明,黄、东海存在两个自由陆架波,在黄海海域呈气旋式传播,一个沿中国大陆向低纬传播,具有较大的振幅和波长,波速为50—70千米/小时,另一个沿朝鲜沿岸向北传播,波速为30—60千米/小时。这些波动发生在大风过境之后,或大风的松弛过程中,其消衰时间约3天。计算还发现,沿冲绳海崖有一向南传播的自由双开尔文波。
In this paper, two-dimensional positive pressure mode is used to simulate the continental shelf traps and circulation in the Yellow Sea and the East China Sea. The model takes all the equations into consideration and the numerical mode adopts the explicit quadratic conservation scheme. The advantage of this model is that it can restrain the nonlinear instability. The calculation results show that there exist two free-standing waves in the Yellow Sea and East China Sea, which are cyclonic in the Yellow Sea and one in the low latitudes of the mainland of China, with a large amplitude and wavelength. The wave velocity is 50-70 km / h. A northward spread along North Korea’s coast at a wave velocity of 30-60 km / h. These fluctuations occurred in the winds after the transit, or gale relaxation process, the decline of about 3 days. The calculation also found that there was a free double Kelvin wave that spread southward along the Okinawa sea cliffs.