【摘要】 利用TRMM卫星探测结果,结合多普勒雷达风廓线资料,研究了2007年7月9日发生于四川盆地南部的一次特大暴雨过程在不同阶段的降水粒子风廓线、潜热和降水结构特征。结果表明:(1)大暴雨区存在低层辐合、高层辐散的典型垂直环流结构。(2)强降水系统由一个主降水云团和多个零散降水云团组成;降水系统中对流降水所占面积比层云降水面积小,但对流降水具有很强的降水率,对总降水量的贡献超过层云降水。(3)降水发展旺盛阶段,强对流降水的雨顶高度可达17 km,强降水主体中垂直方向和水平方向均存在非均匀的降水强度分布;减弱阶段,强降水雨顶高度仅10 km左右,且其层云降水有清晰亮度带。更多还原

【Abstract】 Using TRMM satellite and Doppler radar Vertical Wind Profile(VWP) data,the characteristics of VWP changes on rain particle,latent heat and rainfall structure of a heavy storm occurred in Sichuan basin on July 9,2007 are investigated in the different stages.The results show that(1) there is the typical structure of the vertical circulation with the low-level convergence and the high-level divergence in the heavy storm.(2) The horizontal structure consists of a main precipitation cloud and some cloud cells scattered in the heavy storm;compared with the stratiform clouds,the convective clouds have the smaller size,but the greater precipitation rate,and the greater percentage of the total precipitation.(3) In the development stage,the rain top altitude of the strongly convective precipitation is up to 17 km,and rainfall rate is a heterogeneous distribution structure in vertical direction and horizontal direction;while in the weakening stage,the rain top altitude of the strongly convective precipitation is only about 10 km,and the stratiform clouds has a bright band.更多还原