研究目的
Investigating the spatial and temporal distributions of boundary layer aerosols and determining cloud thickness using a CCD camera-based bistatic imaging Lidar (CLidar).
研究成果
The CLidar system demonstrated excellent resolution at lower altitudes, making it a versatile tool for in-situ environmental characterization of near-ground local pollution as well as for examining higher altitude atmospheric structures such as clouds and boundary layer height. The study successfully monitored spatial and temporal distributions of boundary layer aerosols and determined cloud thickness in Nassau, Bahamas.
研究不足
The study is limited by the assumptions made in the calculation of aerosol extinction, such as the use of a CALIPSO-derived aerosol phase function and an assumed single-scattering albedo. Additionally, the resolution at higher altitudes may not be as excellent as at lower altitudes.
1：Experimental Design and Method Selection:
Utilized a CCD camera-based bistatic imaging Lidar (CLidar) to capture the entire beam from ground to zenith without requiring scanning. The CCD signal, containing the side scattering of aerosols, air molecules, and cloud particles, is normalized to a molecular scattering model in a high-altitude clear region to retrieve single angle aerosol scattering.
2：Sample Selection and Data Sources:
The site was about 2 km south from the north shoreline of Nassau and at an altitude of several meters above sea level.
3：List of Experimental Equipment and Materials:
CCD camera fitted with a wide-angle lens, vertically transmitted laser.
4：Experimental Procedures and Operational Workflow:
The exposure time for each image was 10 minutes. Aerosol extinction profiles were calculated using the average of images obtained during cloudless and apparently aerosol layer-free exposures.
5：Data Analysis Methods:
A CALIPSO-derived aerosol phase function and an assumed single-scattering albedo are employed to calculate aerosol extinction from the normalized signal.
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