【作者】 马学谦； 孙安平； 周万福；

【Author】 Ma Xueqian 1 Sun Anping1 Zhou Wanfu 2 (1 Weather Modification Office of Qinghai Province,Xining 810001 2 Institute of Meteorological Sciences in Qinghai,Xining,810001)

【机构】 青海省人工影响天气办公室； 青海省气象科学研究所；

【摘要】 本文利用西北地形云野外试验期间探测的祁连加密高空资料和白杨沟自动站资料,分析祁连山区产生降水的高空特征与地面表现之间的关系。结果表明:祁连山区强降水时,地面相对湿度很湿或很干,且风向有明显的固定趋向,受大尺度天气系统影响明显,冰水转化层很厚,有明显的播种云与供给云的配合;而弱降水时,地面相对湿度比较高,一般大于60%,但风向有明显的随意性,受地形影响明显,冰水转化层较干,有一定量的供给云,但播种云明显不足,需要引入人工凝结核。更多还原

【Abstract】 The data from field of northwest orographic clouds,Qilian and Bai Yanggou stations,have analyzed high-altitude characteristics of the formation of precipitation and the relationship between ground elements. The research results showed that heavy precipitation in Qilian Mountains have very wet or very dry of relative humidity in ground,and its wind direction is a clear trend of fixed,at the same time,it is significantly affected by the large-scale weather systems,and its transforming layer from ice to water is very thick,seeding clouds harmony with supply clouds. But weak precipitation have relatively high relative humidity,generally greater than 60%,and its wind direction has obvious randomness,it is obviously affected by terrain,and its transforming layer from ice to water is very dry,there is a certain amount of supply clouds,but seeding clouds is deficient in high altitude,so the clouds significantly need the introduction of artificial condensation nuclei.更多还原