基于CALIPSO和转动拉曼-米散射激光雷达研究北京地区大气气溶胶特性

Research of Atmospheric Aerosol Properties over Beijing Region Based on Rotational Raman-Mie Lidar and CALIPSO

为提高大气气溶胶参数反演结果的准确性,结合实验室研制的转动拉曼-米散射激光雷达和NASA的CALIPSO,仅用2个激光雷达的弹性后向散射信号,无需对激光雷达比进行假设,反演出了2012年春季北京上空晴天、雨后、阴霾天气的气溶胶光学参数的垂直分布.结果表明:此方法可有效地获取气溶胶消光系数和后向散射系数的垂直分布;气溶胶的消光系数值在阴霾天气最高,晴天次之,雨后最低.

To improve the accuracy of inversion results of aerosol optical parameters, the rotational Raman-Mie lidar developed by our laboratory and NASA＇s CALIPSO were employed for experimental implementation. Without any hypothesis on the lidar ratio, the vertical distributions of aerosol optical parameters in sunny, haze, and after-rain day over Beijing region in the spring of 2012 were inverted using only two elastic lidar backscatter signals. Experiment shows that this method could effectively obtain the vertical distribution profiles of aerosol backscatter coefficient and aerosol extinction coefficient. The value of aerosol extinction coefficient is the highest in haze day, it comes secondly in sunny day and it is the smallest in after-rain day.