利用Mie散射激光雷达对芜湖市上空的气溶胶光学特性进行观测研究,从观测数据中选取降雨和降雪天气 的特例,通过计算反演得到了雨、雪天气前后气溶胶粒子的光学厚度、气溶胶粗粒子比例以及粒子数密 度的变化情况,经分析得出雨、雪对气溶胶粒子具有一定的洗刷作用。从科学的角度验证了雨、雪是大 气重要的自清洁过程,并初步得到了同等条件下,雪比雨对空气清洁能力更强的结论。

Tropospheric aerosol extinction was profiled by a polarization-Mie lidar before and after a rainy weather system and a snow weather system, respectively. It can be seen that both rainfall and snowfall can clean aerosol particles in the atmosphere from the variation of aerosol optical thickness and the proportion of coarse particle before and after the special weather system. The result shows that snowfall is better than rainfall to flush aerosol particles.