中文摘要：

模拟分析了河南南阳一次层状云人工增雨过程的自然云和催化云的微物理过程.结果表明自然云内冰晶含量很少,冰相过程不活跃,消耗水汽较少,大滴形成较为困难,降水效率低,降水强度出现过2次峰值.通过对自然云的模拟分析可以得出合适的催化部位,一般在过冷水含量较大,温度较低,云稳定维持阶段（模拟第52分）开始播撒,催化位置为（18 km,18 km,6 km）、播撒0.2 g/s,共播撒1 min.在云中加入人工冰核后冰晶含量迅速增加,相应地云水含量有所减少,随着云内冰相过程的不断活跃,降水明显增加,在第148分时出现1个较强的降水中心区,此中心区降水在150 min达到1个小峰值,到172 min时出现2个降水中心,旧的降水中心达到7 mm/h,新的降水中心值不断增加,到180 min时达到16 mm/h,增雨效果明显.

英文摘要：

The microphysical processes of unseeded and seeded stratiform clouds in Nanyang of Henan province were simulated in this paper.The results indicated that the ice crystal content showed very low in the natural cloud,and because the ice phase is inactive,it is difficult to form big drops,so the precipitation efficiency is also low.The precipitation intensity had presented two peak values.Through the analysis of unseeded clouds we can obtain the appropriate catalytic site.Generally,the occasion that the cold water content is large,the temperature is low,the clouds maintain stable is the best seed time（simulates the 52 nd minute）.Catalyzes on the position for（18 km,18 km,6 km）,to spread 0.2 g/s,spreads 1 minute.After adding the ice nucleus in the clouds,the ice crystal content increased rapidly,the rain content decreased correspondingly,with the ice effect become more and more active,the precipitation increased obviously.A high precipitation presented at 148 th minute.This precipitation center achieved its peak value at 150 th minutes.Two precipitation centers were appeared at 172 th minutes.The old precipitation center reached 7 mm/h and the new precipitation center value increased unceasingly,which arrived 16 mm/h at 180 th minutes.That means the rain effect got to its maximum value.