9914号台风降水云系雨强的三维结构初探

A Primary Study on Three Dimensional Structure of Rainfall Rates of Typhoon Dan’s Precipitation Cloud Systems

摘要:

利用TRMM卫星的测雨雷达资料,研究了9914号台风降水云系在3个不同时次雨强的水平和垂直结构。结果表明:3个时次层状云降水在像素数量上及对总降水量的贡献上均比对流性降水大;3个时次层状云降水和对流性降水的平均雨强均随台风强度加强有较大的增幅;对流性降水与层状云降水的雨强的垂直廓线有明显的差别,但两类降水廓线本身在3个时次差别不大。对流性降水廓线按斜率不同大致分为3段,雨强均随高度减小,5~6 km高度段减速最快。层状云降水廓线大致分为4段,在4.5 km高度附近出现明显的亮带结构。

Abstract:

Horizontal and vertical structure of rainfall rates of Typhoon Dan’s precipitation cloud systems at three different times during its life period is studied based on the data from TRMM Precipitation Radar(PR).Results show that stratiformis precipitation occupied more area and contributed more rainfall to the total than convective precipitation at the three times.The average rainfall rate of stratiformis precipitation at the three times varied little while that of convective precipitation had a considerable increase with the intensification of typhoon.In vertical,the profiles of convective and stratiformis precipitation were obviously different while the profiles of themself at the three times had small differences.Convective profiles can be devided into three sects according to the slope,the rainfall rate decrease with altitude and the rapidest decreased occurred within the altitude range from 5 to 6 km.Stratiformis profiles can be divided into four sects,and there was a distinct bright band structure near the altitude of 4.5km.