珠江三角洲锋面暴雨过程的雷达回波特征及其与雨量的关系

对于华南前汛期暴雨过程的雷达回波和卫星云图特征,已有不少定性的研究②,但未能解决用雷达回波作降水定量预报的问题,本文利用珠江三角洲地区75—09—02课题准业务试验期间广州713雷达分层显示和地面加密雨量资料(每小时一次雨量)分析了三次锋面降水过程的雷达回波强度及与地面降水强度之间的Z—R关系、强回波顶高度与地面降水强度的关系,并与国内外利用雨滴谱资料求取的Z—R关系进行了比较。 1.暴雨过程概况

RADAR ECHO FEATURES AND THEIR RELATIONS TO RAINFALL FOR HEAVY FRONTAL RAINS IN THE PEARL RIVER DELTA

Much of the qualitative work on the features of radar echoes and satellite cloud images for the Apr. -Jun. raining periods in South China has not solved the problem of quantitatively predicting precipitation by means of radar echoes. In this paper, layer-by-layer displays of a 713 radar collections in Guangzhou and hourly surface rainfall records, extracted from a quasi-operational experiment for a research project 75-09- 02 in the Pearl River Delta, are used to study the relations of surface rainfall intensity to 1) radar echo intensity, and 2) heights of strong echo tops, for 3 frontal rains. The Z-R relations here is compared with that derived from raindrop spectra by domestic and overseas researchers.