摘要：利用1961—2000年期间河北地区的观测资料,分析了区域低云和毛毛雨的变化趋势。结果表明:低云频率趋于增加,毛毛雨日数趋于减少,特别是在环渤海湾地区和太行山东部平原地区这种变化趋势更为明显。其中渤海湾有关测站的毛毛雨幅度达1～4d,而对应的低云出现频率增加显著。渤海湾地区黄骅站的低云从128d增加到140d,乐亭站的低云从132d增加到159d。同时,利用有关研究结果结合最新观测资料,分析了1980—2000年渤海湾地区的气溶胶变化趋势,在此基础上分析了低云、毛毛雨与气溶胶变化的相互作用。结果表明:它们之间存在着比较好的相关性。最后,对低云、毛毛雨变化可能的气溶胶云物理效应进行了讨论。

关键词：低云日；毛毛雨日；气溶胶；云物理效应

Abstract： Using the data of the year 1961—2000， the variable tendency of low cloud and drizzle days were analyzed in the area of Hebei Province. The results showed that the low clouds frequency tended to increase and drizzle days number tended to decrease. Mostly drizzle days number decreased about 1 d in Hebei Area. But there were three observational stations variety extent was bigger in the Bohai Sea Gulf Area， the number of drizzle days of each station reduced obviously， it decreased 1~4 d， and the number of low clouds days increased clearly. The low cloud days took on upward in corresponding period in both Huanghua and Laoting. The low cloud days increased from 128 d to 140 d in Huanghua， and it ascended from 132 d to 159 d in Laoting. The aerosol varieties was analyzed in different decades from 1980's to 2000's data in the area. Based on above study， the interaction between the variation tendency of low clouds， drizzle days number with aerosols concentration were analyzed. The results showed that there was good correlation between them. The clouds physical effect for aerosol possible affect to low cloud and drizzle days varieties were discussed . 

Keywords：low cloud day； drizzle day； aerosols； cloud physical effect