辽宁夏季积云降水发生频率及人工影响潜力分析

用辽宁14个台站的常规地面观测记录，统计分析了6～8月各类积云的发生频率及其降水特征，结合沈阳站的探空资料，分析了各类积云的降水能力和人工影响潜力。结果表明：①辽宁夏季积云出现概率很大，每站年均41．5d，占夏季总云日的50％以上；②平均每年每站有11d以上的积云降水，为夏季总降水日数的36．9％；③各地区平均积云降水量占总降水量的33．5％，其中积云暴雨量占总暴雨雨量的43．1％；④有层状云伴随出现的积云、积雨云出现的概率较大，但多数情况降水效率不很高，具有较多的人工增雨作业机会和潜力，可以作为人工催化的主要作业对象。

Analysis of Cumulus Precipitation Frequency and Potential of Rain Enhancement in Summer in Liaoning

Based on the observations from 14 stations in Liaoning Province and the radiosonde data from Shenyang Station, analysis is conducted on the occurrence frequency of various cumulus and its precipitation characteristics from June to August, as well as the precipitation probabilities of various cumulus and their potential affected by artificial. The results indicates that: (1) The probability of the cumulus emergence is very high in summer in Liaoning, the annual average rate is 41.5 days and it is over 50% of the total cloud days in summer. (2) There is more than 11 rainy days caused by cumulus on average, and it is 36.9% of the total rainy days in summer. (3) The area averaged cumulus precipitation is 33.5% of the total precipitation, in which the rainfall produced by cumulus heavy rains is 43.1% of the total. (4) The probability of cumulus along with stratiform clouds is quite high, but the precipitation efficiency is not very high in most of situations. There is quite high potential and a great deal of operation opportunities for rain enhancement in Liaoning Province