青海东北部春季系统性降水高层云系微物理结构分析

利用1977－1979年5－6月青海东北部系统性降水高层的云滴谱飞机观测资料，统计分析了该云系云滴群体特征量及微物理结构特点。云特征量的滴浓度，含水量，平均直径，最大直径随高度的分布表明，降水高层云系垂直微结构配置或云水凝物相态可划分为4个不同发展分层，在海拔约5.0km高度上存在一活跃增长层可能是高层发生降水的一个重要特征层，同时分析了云液态含水量随云温的分布特征及与降水的关系。

Analysis on Precipitation Altostratus Microphysical Structure in Spring over North-East Qinghai

Using the cloud particle spectrum data of precipitation altostratus by airplane observations in May and June 1977-1979 over north east Qinghai, the characteristic parameters of cloud group particles and microphysical structure statisticlly analysed. The vertical distributions of cloud drop concentration, water content, cloud drop average radius and maximum radius show that the coagulation water phase can be partitioned into 4 growth layers. There is a active growth layer over sea level about 5 km that may be an important feature layer to occur rain in altostratus there. In the meantime, the relationship of liquid water content with cloud temperature and with precipitation value are analysed