平凉地区强对流钩状回波特征的观测研究  

Observational Investigation of Characteristics of Severe Convective Hook Echo in Pingliang Region

作　　者：张鸿发[1] 龚乃虎[1] 贾伟[1] 王致君[1] 张焕儒[2] 

机构地区：[1]中国科学院兰州高原大气物理研究所 [2]甘肃省气象局

出　　处：《大气科学》1997年第4期401-402,共2页Chinese Journal of Atmospheric Sciences

基　　金：中国科学院兰州分院择优基金

摘　　要：最近１０年平凉地区人工防雹试验期间，用雷达测到的强对流雷暴云回波上，发现雹暴云除有强度和云高作判别外，在回波形态和结构上，多数雹云在发展过程中呈气旋形回波形状，其中部分强雹云演变成明显钩状回波，少数特强雹暴云有反气旋钩状回波，并向气旋钩状演变的特点。在钩状回波形成和维持阶段，回波反射率Ｚｅ达到最强，之后不再增加，有些钩状回波的云高有时可跃增１～３ｋｍ高度，云体出现崩溃，地面有降雹。针对这些观测事实。In general, the cloud intensity and cloud height from radar echo can be used to discern the hailstorm echo. During the experiment of antihail in Pingliang region for the last ten years, it is observed that there are some other characteristics of the severe convective hook echo. in the process of development of the hail, most of hailstorms show cyclonic echo shape, some of which evolve gradually the obvious hook echo and a few stronger of which have the feature of change from an anticyclone hook into cyclone hook. And in the stage of the stability of the hook, the radar reflectivity factor Z e becomes maximum and then begins to decrease. In this process, the cloud height of hook echoes sometimes may increase by 1～3 km, soon after that hailcloud is dispersive, and fallen hails may be observed on the ground. Furthermore, some statistic analyses on these observations are made in this paper.

关 键 词：冰雹云 回波特征 强对流 气象雷达 

分 类 号：P412.15[天文地球—大气科学及气象学] P412.25