摘要
利用高分辨率f平面正压拟谱模式,分析一个β中尺度涡对双台风相互作用影响的物理过程。结果表明:β中涡的存在可以使原本排斥的两个DeMaria型台风涡旋合并;β中涡改变双台风相互作用终态的物理机制是:初始时段处于某一台风涡旋正影响区内的β中涡,构成了非对称涡度场,进而在该台风涡旋内部产生指向另一个台风涡旋的气流。该气流如果足够强,则会使两个台风的中心距离在短时间内下降到合并临界距离之内,触发双涡合并过程的发生。
By utilizing a high resolution f-plane barotropic pseudo-spectral model, the physical process of the influences of a meso-β vortex on the binary interaction of typhoons is analyzed. The results show that the meso-β vortex may alter the process of binary interaction and trigger a merging process. The physical mechanism by which the meso-β vortex can alter the final state of binary interaction is：when the meso-β vortex locates in the positive influencing area of one typhoon at the initial period time, an antisymmetric vorticity field comes into being and inspire airflows pointing to the other typhoon;and if those airflows are sufficient strong, they will make the two typhoons moving to each other and entering into the merging critical distance in a shorter time, which finally causes the mergence of the two typhoons.
出处
《南京气象学院学报》
CSCD
北大核心
2008年第4期494-502,共9页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金重点资助项目(40333028)
关键词
双台风
涡合并
中尺度涡旋
非对称涡度场
Binary typhoons
vortex merging
meso-scale vortex
antisymmetric vorticity field
