用滤膜法观测大气冰核的静力扩散云室

A STATIC DIFFUSION CHAMBER FOR DETECTING ATMOSPHERIC ICE NUCLEI BY USING FILTER TECHNIQUE

中文关键词:  冰核  静力扩散云室  滤膜法

英文关键词:Diffusion chamber  Filter  Ice nuclei

中文摘要:

      介绍了经过改进的用滤膜法观测冰核的静力扩散云室及其取样装置。叙述了其各组成部分的原理、结构、达到的性能指标,分析了各系统的工作对冰核活化条件的影响。给出了对相对稳定的人工AgI冰核源作不同体积的取样和不同温度下的处理结果,同时也给出了用该设备对北京市海淀区冬季冰核浓度的日变化所做的初步观测结果。

英文摘要:

      An improved diffusion chamber using filter technique has been developed for detecting atmospheric ice nuclei. A movable partition board between the chamber top and bottom plate is designed in order to cut off the vapor source before and after the filter samples being produced. By using a relative stable AgI aerosol source, the examination tests of the chamber responding to ice nuclei concentration have been conducted with various sampling volume filters and under different temperatures. The ice nuclei concentrations have been measured using this equipment and the average daily variation in wintertime at northwestern suburb of Beijing has been given. All these results show that the diffusion chamber will be useful for the study of cloud and precipitation physics.