基于TRMM卫星资料的江西一次大暴雨过程降水结构特征  

Precipitation Structure Analysis of a Heavy Rainstormin Jiangxi Based on TRMM Satellite Data

作　　者：蒋璐君 刘熙明 张弛 Jiang Lujun;Liu Ximing;Zhang Chi(Jiangxi Institute of Meteorological Science,Nanchang 330096,China;Jiangxi Meteorological Observatory,Nanchang 330096,China)

机构地区：[1]江西省气象科学研究所,江西南昌330096 [2]江西省气象台,江西南昌330096

出　　处：《气象与减灾研究》2021年第4期257-265,共9页Meteorology and Disaster Reduction Research

基　　金：国家自然科学基金项目(编号:41765001);江西省气象局气象科研面上项目“江西省风廓线雷达资料的质量控制与同化研究”.

摘　　要：利用热带测雨卫星(TRMM)的降水雷达(PR)和微波成像仪(TMI)连续2个轨道的探测结果,分析了2013年6月26—29日发生在江西省北部地区的中尺度降水过程不同降水阶段的降水水平结构、雨顶高度、降水廓线的变化特征。结果表明,此次降水过程由强对流云降水逐渐演变为对流性较弱的层状云降水。对流云降水阶段降水系统由成片层状降水云团中分布的多个零散强对流降水云团组成,降水分布不均匀,强对流云降水对总降水量的贡献大。层状云降水阶段,层状云中强对流单体消失,对流云降水像素及对流云降水率对总降水量的贡献减少,降水雨强谱变小,降水高度逐渐降低,云体高层降水量减少。对流云降水和层状云降水廓线存在差异,最大降水率出现的高度越高且中高层降水量越大,降水的对流性则越强。The horizontal structure of precipitation,the variation characteristics of rain top height and precipitation profile in different precipitation stages of a mesoscale precipitation process happened in the northwest part of Jiangxi during June 26 to 29,2013 were analyzed by using the data from precipitation radar(PR)and passive microwave imaging(TMI)onboard the Tropical Rainfall Measuring Mission satellite(TRMM).The results showed that the precipitation process gradually evolved from strong convective precipitation to stratiform precipitation with weak convection.In the stage of strong convective precipitation,the precipitation system was composed of several scattered convective precipitation clouds distributed in the stratiform cloud precipitation with uneven precipitation,and the contribution of convective precipitation to the total precipitation was significant.In the stage of stratiform precipitation,the strong convective monomers disappeared,the convective precipitation pixels and the contribution of convective precipitation to the total precipitation decreased,the spectrum and height of precipitation decreased,and the precipitation in the middle and upper layers of the cloud decreased.The vertical precipitation profiles showed that there were differences between convective precipitation and stratiform precipitation profiles,and the higher the maximum precipitation rate and the higher the precipitation in the middle and upper layers,the stronger the convective precipitation.

关 键 词：暴雨 TRMM卫星 降水结构 降水廓线 

分 类 号：P426.6[天文地球—大气科学及气象学]