热带气旋逆时针打转物理机制的研究

ON PHYSICAL MECHANISM OF TROPICAL CYCLONE LOOPING IN A COUNTERCLOCKWISE SENSE

应用一个无基本气流的准地转斜压模式数值模拟热带气旋逆时针打转运动。分析结果表明：对称气流对非对称涡度的平流引起非对称流场中的小尺度涡旋和通风气流逆时针旋转；旋转的通风气流引导热带气旋作逆时针打转运动。

The problem of a tropical cyclone lcoping counterclockwise is investigated using aquasi-geostrophic baroclinic model without basic flow involved.Analyses show that asymmetricvorticity advected by symmetric flow gives rise to the counterclockwise rotation of small-scalegyres and ventilation flow in the asymmetric field,the latter of which is responsible for thecounterclockwise looping of the tropical cyclone。