Aerosol Optical Depth Determination by Combination of Lidar and Sun Photometer
Two campaigns of investigation of the atmosphere over the urban area of the Sofia City were carried out. Active (lidar) and passive (sun photometer) remote sensing were used to study various optical characteristics (extinction coefficient, aerosol optical depth and Angstrom parameters) during the convective boundary layer formation. The aerosol optical depth values obtained from the two devices during simultaneous measurements performed in clear sunny days are juxtaposed. The results show that the values of the aerosol optical depth taken by the sun photometer exceed those retrieved from the lidar data and depend on the aerosol structure in the stage of the planetary boundary layer development.
Keywords Lidar, sun photometer, aerosol optical depth
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