甘肃夏季不同天气系统层状云的微物理结构特征

The microphysical structure of stratiform cloud in different weather systems in Gansu in summer

利用2006、2007年7—8月13架次的机载粒子测量系统实时探测资料,对甘肃省夏季不同天气系统层状云的宏微观物理特征进行了分析.结果表明,3种类型天气系统背景下,云粒子结构分布不均匀,在云滴浓度和谱型分布上有很大的差别.高原低槽型天气背景下云粒子浓度较大,云中冰晶丰富,具有最大可播区;西北气流型背景下云粒子浓度大,且冰晶浓度较小,具有较大范围的强可播区;西南气流型背景下云滴和冰晶浓度均较小,可播区较小.

The macro-micro physical structure of stratiform cloud in different weather systems was analyzed for summer by using the data of airborne particles measuring system from July to August of 2006 and 2007 in Gansu.The observation showed that the structure of particles in the cloud was uneven.In terms of cloud droplet concentration and spectrum,there were many differences in the three weather systems.In the plateau low trough weather system,the cloud had the characteristics of a high concentration of cloud droplets and high concentration of ice crystals,so the seedable area was the largest.The cloud in the northwest air current weather system had the characteristics of a high concentration of cloud droplets and low concentration of ice crystals,which was highly seedable.It was lowly seedable in the southwest air current weather system.