711B雷达强降水天气的资料分析

利用中卫数字化711B测雨雷达观测降水天气的资料，分析了冰雹、暴雨等强对流降水、混合型降水、层状云降水天气的雷达回波强度、回波形状、顶高、水平尺度、持续时间等特征．讨论了冰雹云与暴雨云的回波差异，及不同种类过程的雷达天气学预报指标．针对2003年中卫三次人工增雨作业，初步分析了增雨效果；从雷达气象学角度，讨论了适合增雨防雹的最佳作业条件．分析表明：适宜火箭增雨的云顶高度在6.0km左右，强回波区高度越高，增雨效果越好．云顶高度较低时，火箭增雨无明显效果．该研究对指导人工增雨作业、提高人工影响天气水平具有重要参考作用．

Analysis on severe convection weather indices with 711B radar data

Using severe convection digital data of 711B radar in Zhongwei,feat ures of echo intensity,pattern,height,horizontal scale of echo,lifespan of h ail,torrential rain,mixed rainfall,stratus rainfall were analyzed. The differ ence between hail cloud and torrential rain cloud,and indices of different weat her were discussed. The artificial rainfall enhancement effect in Zhongwei was a lso analyzed based on three operations in 2003. The optimal conditions for pro-rainfall and anti-hail were discussed. Results indicated that the average top h eight of cloud when reached 6km was favorable and the higher the height of echo ,the better the effect of pro-rainfall,and the rocket contributed little to r ainfall if the cloud was too low. The research here is important to improve the standard of artificial weather modification in Zhongwei.