热带气旋的结构对其移动影响的动力分析

The dynamical research of TC structure on movement

视热带气旋 (以下简称TC)为半径等于R的圆形涡旋 ,对其水平运动方程作在整个TC区域的平均 ,进而得到了TC风场结构引起的TC移动方程 ,求出其解析解 ,并据此讨论TC风场结构对TC路径的影响 ,结果表明 :即使是轴对称的TC ,其路径也有周期性的正 (余 )弦摆动 ,且摆动周期不仅与TC所在纬度有关 ,还受TC的尺度、最大风速及其半径等影响 ,在半周期和整周期附近移向有突然左折的趋势 ;而TC的 1波非对称分量 ,并不对TC的移动产生直接影响 ;只有当TC的非对称分量为多波 (如 2波 )形式时 ,才对TC的移动产生直接的显著影响 ,且与非对称分量的初始位相有关 .此外 。

Taking the tropical cyclone (TC) as a circular vortex with radius R , horizontal motion equations are averaged over the whole TC area to get its movement with non friction, weak environment. Then, we obtain it's analytical resolution, and discuss the influence of the TC structure (include axial symmetry and asymmetry) on movement. The results show that TC moves flutter periodicity with sinusoidal or cosine by the influence of TC structure, and the mobile direction changes abruptly at complete period and semi period. The asymmetrical structure with wave number 2, and more than, can create the extra movement, but can't with wave number 1.