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Particle size distribution retrieval from multiwavelength lidar signals for droplet aerosol

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Abstract

A method of retrieval of the aerosol particle size distribution (APSD) from multiwavelength lidar signals is presented. Assumed distribution (usually a bimodal combination of lognormal functions) with a few free parameters is directly substituted into the lidar equations. The minimization technique allows one to find the parameters that provide the best fit of the assumed APSD by comparison of theoretically generated and experimental signals. Prior knowledge of the lidar ratio is not required. The approach was tested on a typical synthetic APSD consisting of spherical droplets. Comparison of lidar measurements with results from a condensation particle counter was also performed. For signals registered at 35 wavelengths from the UV to the near IR a satisfactory retrieval of synthetic APSD is possible for the particles within the 1003000nm range.

© 2008 Optical Society of America

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