选取2013年1月灰霾天气和2月晴好天进行气溶胶垂直分布的雷达观测研究,并对不同高度气溶胶消光系数进行对比分析。结果显示在研究时间段内,晴好天时气溶胶的垂直分布不均匀,易出现垂直分层现象,而灰霾天时气溶胶主要集中在垂直高度1 km以下,基本无分层现象。对比分析显示,严重灰霾天时气溶胶消光系数较大,在离地400 m高度可达到中度污染天的5倍,晴好天的50倍。此外,整层大气的气溶胶光学厚度AOD与离地400 m处消光系数具有较好的相关性。

The vertical distributions of aerosols are obtained based on the micro-pulse LiDAR. We analyzed coefficients at different altitudes in January and February 2013. The results show that aerosol vertical distributions of clear days are non-homogeneous with multiple layers at different altitudes, while aerosols are concentrated in the layer below than about 1 km during severe haze days. Analyses show that aerosol extinction coefficients are larger in heavy haze days, reaching up to five times of that of medium polluted days and 50 times of that of clear days. It is also found that Aerosol Optical Depth(AOD) is in good relation to aerosol extinction coefficients at 400 m during this haze event.