西北干旱地区一次降水性层状云的飞机观测分析

摘要

In order to improve the scientificalness and effect of the artificial rainfall,and select operation opportunity and operation sites more accurately,the aerial observation of a rainfall weather process occurred in the west region of Gansu Province on August 30,2007 was carried out by using airborne PMS particle detection system.We had some understanding about the micro physical structure of summer precipitation cloud in arid region of northwest China through analysis of the micro physical feature of the precipitation cloud.The observation showed that the average concentration of small particles in the cloud was 4.62 × 106 m-3,the average liquid water content (LWC) was 0.0134 g/m3,and the mean diameter of cloud droplet was 15 μm.LWC and the concentration of cloud droplet in the upper part of the cloud were bigger than those of the lower part,and the water vapor was transported mainly by the higher weather system.%利用机载PMS粒子探测系统对2007年8月30日甘肃省河西地区一次降水性天气过程进行空中观测,通过对云的微物理特征进行分析,对西北干旱地区夏季降水云的微物理结构有了一些认识.观测到此次云层中小云粒子平均浓度为4.62×106个/m3；计算含水量均值为0.0134g/m3;粒子平均直径均值为15 μm.发现云系上层云水含量、云粒子浓度都较下层大,水汽主要由较高层的系统输送.