利用2009年4月18日一次积层混合云飞机云物理观测和播云试验资料， 结合卫星、 雷达、 加密探空和雨量等观测资料， 对该次积层混合云系人工增雨作业条件作业效果和云降水变化进行了综合分析。结果表明， 此次降水云系为积层混合云， 云中过冷水丰沛， 具有很好的可播性， 强可播区占作业云体的主要部分； 云的可播性与雷达回波有一定的对应关系， C波段雷达回波的强弱与降水粒子谱有较好的相关性， 与云滴谱相关性相对较弱； 播云作业过后， 云中小云粒子浓度减少， 大云粒子和降水粒子浓度增加， 雷达回波的相应位置出现亮带； 提出了利用作业影响区和对比区的区域雨量变化率来分析作业效果的方法\.此次过程的计算结果表明, 作业过后3~4 h内降水增加, 雨量增幅为120%~180%。
Based on the designed cloud physical observation and cloud seeding experiment data in Zhangjiakou, Hebei Province on April 18, 2009. the precipitation enhancement seeding condition and cloud precipitation development of convective-stratiform mixed clouds were studied combined with satellite, radar, radio sounding and precipitation observation, etc. The results show that the precipitation cloud system is convective-stratiform mixed clouds with large amount of super-cooled liquid water, which is very suitable to be seeded. During the seeding period, highly seeded region is the main part of operated clouds. There are some relationships between the cloud seeding ability and radar echo. The intensity of C-band radar echo is in good accordance with precipitation particle spectrum, but in weak relativity of cloud particle spectrum. After the seeding operation, the concentration of small-particle decreased, while large cloud droplet and raindrop concentration increase, and radar echo show a bright band in the relevant position. Through calculating the rainfall variation rate between seeding region and contrast region, a method of analyzing the seeding effect is proposed. The calculated result of this case shows that the rainfall increase about 3~4 h after seeding operation, and rainfall amount increased by 120%~180%.
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