利用多普勒雷达资料分析一次强降水的中尺度流场  

Analysis on Mesoscale Circulation within a Heavy Rain System Using Doppler Radar Data

作　　者：杨毅[1] 邱崇践[1] 

机构地区：[1]兰州大学大气科学学院,甘肃兰州730000

出　　处：《高原气象》2006年第5期925-931,共7页Plateau Meteorology

基　　金：国家自然科学基金项目(40175010)资助

摘　　要：利用多普勒雷达风场反演资料对 2003年7月4～5日发生在我国江淮地区一次大暴雨过程的流场结构进行分析,结果表明, 在降水带附近中低层有一个由西南与西北气流交汇形成的辐合带, 高层受偏西气流控制;中低层的辐合带长时间维持,是这次持续性降水的主要原因.辐合带南侧的西南气流将暖湿空气源源不断地输送到降水地区,为这次持续降水提供了充沛的水汽.A two-step variational method of 3D wind is introduced to analyze the stream structure of a heavy rain event occurred in the Yangtze River and Huaihe regions on 4-5 July 2003 by using the Doppler radar. The result shows that a convergence band long existed in middle and lower levels, which were formed by southwesterly flow and northwesterly airflows, caused the heavy rain. Aloft, the westerly airflow predominated. The convergence in lower levels caused stronger updraft that resulted in the intensification of this rainfall system. Rich moisture was supply to maintain the heavy rain by the stronger southwesterly airflow on the south side of the convergence band.

关 键 词：多普勒雷达 暴雨 流场结构 反演 

分 类 号：P458[天文地球—大气科学及气象学]