泰安地区一次冰雹过程雷达回波特征分析

Analysis of Doppler Radar Echo Characteristics During a Heavy Hail in Taian

利用泰山CINRAD／CD多普勒天气雷达资料，对2013年9月15日发生在山东省泰安市地区的一次冰雹天气过程进行分析。发现：在PPI反射率因子图中冰雹特征不明显的情况下，PPI径向速度图像中的中气旋结构可以辅助判断冰雹的发生。反射率因子垂直剖面图上的悬垂状回波以及低层的弱回波可以作为识别冰雹的特征；另外可以根据径向速度垂直剖面图判断垂直流场特征，为进一步确定冰雹提供依据。同时，垂直累积液态水含量（VIL）、回波顶高（ET）的跃增也是表征冰雹发生的重要指标。

The radar echo characteristics of a heavy hail occurred on September 15 , 2013 in Shandong Province are analyzed by means of CINRAD / CD data from the Taishan radar station. The results indicate that Cyclone structure can determine the occurrence of hail in the case of poor Reflectance characteristics . To make a further efforts to determine the hail, we can also look for Drape-like echo,Weak echo,Judgement of the vertical flow characteristics. It is a significant incase in Vertically integrated liquid water or in Echo top Indicate the occurrence ot a hail.