热带气旋的内、外区结构──Ⅰ.正压模式

INNER AND OUTER STRUCTURES OF TROPICAL CYCLONE Ⅰ. BAROTROPIC MODEL

将热带气旋分为内外两区，两区的空间、时间及物理量有不同的尺度，应用尺度分析和摄动法到热带气旋的两个区域，分别在正压模式和斜压模式中求得了这两个区域的控制方程，在两个模式中，还解析地求得了两个区域的流场和气压场，得到的结果与实际热带气旋的结构较为接近。研究表明，热带气旋内区和外区有不同的控制方程，内区受旋转风和一个演化方程制约，而外区受梯度风和另一个演化方程制约。

Tropical Cyclone is divided into two regions in which the scales of time, space and physical quantity are all different. Applying scale analysis and perturbation method to the two regions of Tropical Cyclone the governing equations of barotropic and baroclinic models are obtained respectively. In the two models the stream and pressure fields are solved analytically, the obtained structures are close to observations.It is shown that the inner and outer regions of Tropical Cyclone have different governing equations.The inner region is governed by the cyclonic wind and an evolution equation,the outer region is governed by the gradient wind and another evolution equation.