Differential Absorption Lidar for measuring sub-hourly ozone variation in the boundary layer and free troposphere during the daytime and nighttime

摘要: The school of Graduate Studies University Alabama in Huntsville Degree Doctor Philosophy College/Dept. Science/Atmospheric Science_ Name Candidate Shi Kuang_______________________________________ Title Differential Absorption Lidar for Measuring Sub-hourly Ozone Variation the Boundary Layer and Free Troposphere during Daytime Nighttime at (UAHuntsville) NASA have jointly developed a tropospheric ozone (DIAL) system using two receivers lasers 285 291 nm. This lidar is making regular observations vertical distributions both boundary layer free troposphere between 0.5 8 km under daytime nighttime condition. dissertation discusses detail hardware components including transmitter, receiver, detector. A compact, LED-based simulator has been designed to characterize lidar’s performance calibrate systematic errors associated with measurements. describes data processing, various retrieval algorithms, error analysis, comparisons coincident ozonesonde measurements, typical time-height retrievals. For lidar, it challenge remove aerosol interference layer. An effective correction procedure two-wavelength DIAL reduce arising from differential backscatter lower troposphere. three-wavelength dual-DIAL technique also presented as future scheme. flights demonstrate that accuracy ranges better than 10% below 4 20% 750-m resolution 10-min temporal integration. We give an analysis nocturnal residual pollution transport satellite instrument validation illustrate scientific applications. providing unique