Aerosol Observation by Lidar in Taizhou Area

Through statistical analysis of extinction coefficient, depolarization ratio, boundary layer height and aerosol optical thickness of Lidar products, and comparison with environmental monitoring data and ground meteorological observation data, the reliability of the Lidar product is verified. By analyzing the vertical profile and temporal and spatial distribution of extinction coefficient, it is found that, in general, the vertical variation trend of atmospheric extinction coefficient is close, which starts to increase from near the ground and reaches the peak at the height of about 1km, where the boundary layer lies. Based on the data, in April, November and December, the atmospheric extinction coefficient is higher, the atmospheric aerosol concentration is higher, in August, September and October, and the aerosol concentration is lower, which is consistent with the environmental monitoring data. The correlation analysis of Lidar products with environmental monitoring data and ground meteorological observation data showed that the ground visibility and extinction coefficient have better exponential correlation; the concentration and extinction coefficient of PM_2.5 and PM₁₀ near the ground have better power correlation; the aerosol optical thickness has linear positive correlation with PM_2.5 and PM₁₀ concentration. There is a significant negative correlation between the height of the boundary layer and PM_2.5, PM₁₀, but it is not highly correlated with others. These correlation studies verify the effectiveness of Lidar in detecting atmospheric aerosols.