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本文采用轴对称9层原始方程模式,模拟了环境流场影响下,台风发生发展的过程。初始条件中,没有采用作为CISK基本特征的起始地面平衡涡旋,而采用了流场的径向和切向风速为零、温度场和气压场是水平均匀的初值。但存在环境流场的影响,这种影响表现为有与实际观测值相同的对流层上层的气旋式动量的流入。在上述条件和25km网格尺度的凝结条件下,一个切向、径向风速的分布,台风眼、眼壁以及降水分布等特征都和观测结果非常相似的台风模式,得到迅速的发展。最后从模式的结果还进一步讨论了启动台风发展的物理本质。
In this paper, a 9-layer original equation of axisymmetric model is used to simulate the process of the occurrence and development of typhoon under the influence of environmental flow field. In the initial condition, the initial ground-balance vortex which is the basic characteristic of CISK is not used, but the radial and tangential wind velocities of the flow field are adopted, and the temperature field and pressure field are the initial values of uniform water level. However, the influence of the environmental flow field exists. The effect is the inflow of cyclonic momentum at the upper troposphere with the same observed value. Under the above conditions and the condensing conditions of 25km grid scale, a typhoon pattern with the distribution of tangential and radial wind speed, typhoon eye, eye wall and precipitation distribution are all very similar to the observation results. Finally, the results from the model also further discussed the physical nature of the development of the typhoon.