9806号台风非对称结构形成及其高纬西折路径分析

THE ANALYSIS OF ASYMMETRICAL STRUCTURE FORMING AND THE WESTWARD-DEFLECTING OF TYPHOON 9806 TRACKS IN HIGH LATITUDE

对9806号台风在弱环境场中向北移动,至强环境场中折向西行的物理机制进行了分析,得出在弱环境场中台风可形成不对称结构,其物理量如高度的变化在台风进入强环境场后会与环境场叠加,从而改变台风移向。强弱环境场的更替,可能是9806号台风移向突变的重要原因。

The paper analyzed the physical mechanism that caused Typhoon 9806 to move toward north under the weak environmental condition field and to turn to the west under the strong environmental condition. It is concluded that the typhoon formed an asymmetrical structure under the weak environmental condition field and its physical elements such as the variation of height will add to the environmental condition field and change Typhoon 9806's tracks when it move into the strong environmental condition field. So probably the alteration of the weak-to-strong environmental condition field is the important reason for causing the track's mutation of typhoon 9806.