摘要
通过对不同雨强台风的诊断对比及数值试验得出一些结论。台风暴雨与锋区、高低空急流有关。强锋区可导致２００ｈＰａ西南风高空急流与右后方非地转辐散的加强，并在其作用下，激发重力惯性波。其调整过程，即为暴雨的突然增幅过程。调整时间约３～６小时。调整过程使低空急流加强，加大向暴雨区的水汽动量输送，有利于降水加强。调整过程结束后，雨量变化平稳。
Some conclusions have drawn from the diagnosis,comparative analysis and numericalstud y of typhoons with varied precipitation intensities. It is found that the typhoon rainstorm isassociated with the presence of a frontal zone,high- and low-level jet;an intense frontal zone isresponsible for the enhancement of 200 hPa southwesterly jet and ageostrophic divergence on therear right,whose effect will excite gravity-inertia waves;the adjustment(spanning 3～6h)isnone other than the abrupt intensification of the rainstorm,giving rise to the strengthening oflow level jet that carries abundant water and momentum into the rainfall area for still heavierrain;after the ending of the adjustment,precipitation is kept steady.
出处
《南京气象学院学报》
CSCD
1995年第2期234-241,共8页
Journal of Nanjing Institute of Meteorology
基金
"85-906-07-04-02"课题资助
关键词
台风
对比
锋区
高空急流
数值试验
typhoon,comparative analysis,frontal zone,high-level jet
