激光雷达探测反演PM2.5浓度的精度研究

给出了355nm激光雷达与布设在中国科学院大气物理研究所325m铁塔上的BAM-1020颗粒物监测仪对比观测实验的结果,通过2011年9月21日至10月21日一个月的对比实验发现,激光雷达探测的气溶胶消光系数与实测的PM2.5浓度之间存在较好的相关性。利用线性回归模型建立消光系数与颗粒物浓度之间的关系式,并通过铁塔实测的PM2.5浓度对该关系式在垂直高度上的反演精度进行研究。结果显示,在63,80,120,160m高度处雷达反演的PM2.5与实测值之间的相关系数分别为0.9447,0.9331,0.9284,0.9308,说明激光雷达能有效探测颗粒物的垂直分布状况。激光雷达探测将有利于研究污染物的空间分布状况和污染物跨界输送问题,并为区域大气联防联控制定政策和措施提供数据支持。

Study of Accuracy of Lidar Inversion PM2.5 Concentration

The results of comparison observation experiments between the 355 nm lidar and BAM-1020 particulate monitor laid on a 325 m tower of the Institute of Atmospheric Physics of the Chinese Academy of Sciences are given. Based on the data from 21 September 2011 to 21 October, good correlation between aerosol extinction coefficient by the lidar and PM2.5 particulate matter concentration is found. The linear regression model to establish the relationship between the extinction coefficient and the particulate matter concentration is used. The data of PM2.5 concentration measured by monitor laid on tower is used to study the inversion accuracy of the relational expression on the vertical height. The study results show that the correlation coefficients between lidar inversion PM2.5 and the measured values at 63, 80, 120 and 160 m are 0.9447, 0.9331, 0.9284 and 0.9308, respectively. The result shows that the lidar can detect the vertical distribution of particles. The lidar will be beneficial to study the spatial distribution and cross-border transportation problems of pollutants, as well as provide data to support policies and measurements of joint prevention and control of regional atmospheric.