中文摘要：

对1960—2011年中国东部地区微量降水的变化特征进行研究，并通过干燥晴天能见度、气溶胶光学厚度及云滴粒子有效半径等变化特征验证大气气溶胶对微量降水的影响，结论是气溶胶导致的微雨减少主要集中在华北京津塘、长江三角洲和华南沿海地区，且气溶胶越多的地区，微量降水的减少越严重。

英文摘要：

Both the mumber of slight rain（defined as 0 - 1 mm per day） days and the rainfall mount of slight rain decreased distinctly in the most regions of eastern China during the past 50 years, except in some regions in the northern part of eastern China. The positive correlation between the visibilty during dry and sunny days and the variation of slight rain were found in the regions of the Beijing-Tianjin-Tangshan district,the middle and low reaches of the Yangtze River, and the coast of southern China. At the same time, the increase of AOD （aerosol optical depth） , the decrease of visibility, and the reduction of cloud droplet radius were found in the above-mentioned regions, and it is inferred that the reduction of slight rain in these regions is related to the radiative effects of aerosol.