摘要
根据飞机探测仪器观测到的云中粒子微观结构,结合卫星、雷达和常规天气资料,分析了人工增雨作业前后云的宏、微观物理结构和降水变化。结果表明,作业后影响区云中的冰晶浓度、雨滴直径比对比区有明显增加,云中过冷水减少;对比区降水回波强度和强回波区面积变化不大,而影响区最大回波强度增大,强回波区的面积扩大,降水增加。这与影响区云中降水粒子增多、直径增大是一致的,这些结果说明了液态CO2催化层状云的物理响应。
The detail information is deduced on the microphysical affection of stratiform cloud seeding, including in situ aircraft measurements, radiosondes, radar data, and surface observations in the experiment of precipitation enhancement in Jilin Province during 11 - 12 July 2002. The results indicate that the maximum of cloud super cooled liquid water content reaches 0. 1 - 0. 2 g/m^3 , but the concentration of ice crystal is very low for nature cloud. It means that the cloud is eligible for precipitation enhancement seeding according to principle of weather modification The changes of cloud microphysical structure, such as the increasing of ice crystal concentration and diameter of rain droplets, the decreasing of super cooled liquid water content, are caused by seeding liquid CO2. The increase in radar echo intensity in the incidence area eomparing with the target area is also caused by cloud seeding, which is similar to the increase in concentration of rain droplets observed by in situ aircraft. For the precipitation intensity in the incidence area of cloud seeding increases but it only slightly changes in the comparison area. The redistribution of rainfall is caused by cloud seeding in the precipitation area.
出处
《大气科学》
CSCD
北大核心
2007年第1期99-108,共10页
Chinese Journal of Atmospheric Sciences
基金
中国科学院知识创新工程重要方向项目KZCX3-SW-225
国家自然科学基金资助项目40175003
40275002
关键词
综合观测
液态CO2(LC)人工引晶
云微物理特征
in situ aircraft observation, liquid carbon dioxide, cloud seeding, structure of cloud microphysics
