北京奥运期间大气光学特征初步分析

以双波长三通道拉曼激光雷达对2008年北京奥运会期间大气状况进行了测量与分析,给出了奥运主场馆上空气溶胶消光系数、后向散射回波信号及波长消光比垂直分布及时空变化,计算了气溶胶消光散射比、光学厚度及Angstrom波长指数,结合地面监测数据分析了奥运期间典型天气间气溶胶光学特征的变化.结果表明,8～9日两天空气污染相对较重,主要为较大粒径粒子所致,降雨后气溶胶光学厚度有着明显的升高过程,出现较小粒径污染物的堆积.

Analysis on the Atmosphere Optical Characteristics of Beijing Olympic Games by Raman Lidar

he typical atmosphere optical characteristics of Beijing Olympic Games were measured and analyzed with Raman lidar from Aug. 7th to Aug. 25th in 2008. The vertical profile and spatio-temporal distribution of aerosol extinction coefficient, backscatter signal and the ratio of extinction at different wavelength were shown, and the ratio of aerosol extinction and backscattering, optical depth and Angstrom exponent were calculated respectively. The variability of aerosol optical characteristics and the possible cause of formation were analyzed in combination with the ground level monitoring data. The results show that the heavy air pollution from Aug. 8th to 9th in 2008 is mainly caused by biggish size particles, the aerosol optical depth increases with small size contaminant accumulation after rain, and the Raman lidar is a flexible tool for atmosphere optical characteristics measurement.