Dynamic Lidar Ratio Calculation and Aerosol Vertical Extinction Coefficient Retrieval Based on Observed Visibility

ABSTRACT Micropulse lidar (MPL) cannot directly retrieve the aerosol extinction coefficient under cloudy conditions and at night. Therefore, we used ground visibility, Fernald’s near-end solution method, linear correlation between signal (photons) (correlation = 0.98), to calculate constant ratio (LR). We compared optical depth (AOD) retrieved from MPL AOD multifilter rotating shadowband radiometer (MFRSR-7) same band (532 nm). The was 0.77. vertical distribution of aerosols in daytime nighttime during summer obtained July 00:00 12:00 Beijing time (UTC+8). In daytime, clear sky conditions, displayed a unimodal peak approximately 2000 m. night more complicated than that day, with three results. first monotonically decreasing upper layer, 600 m two peaks 1200 general, is higher below near-ground day.