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Determination of the optical and microstructural characteristics of water droplet clouds in laser sensing taking into account multiple scattering

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Abstract

We considered the inverse problem of retrieving the profiles of the extinction coefficient and effective cloud droplet size from lidar returns measured for different receiver field-of-view (FOV) angles. For the solution of the problem, we suggested a special mathematical formulation of the lidar equation, taking into account multiple scattering in the framework of the small-angle approximation of the transfer theory. In the multiply scattered signal, we separated the diffraction component which, for large FOVs, explicitly depends on the effective particle size. The sought characteristics are retrieved using a developed iteration algorithm of the solution of the system of lidar equations defined for two and more FOV angles. We presented the results of the algorithm testing in processing of the field data of laser sensing of stratocumulus clouds. The retrieved extinction coefficients and cloud particle sizes are found to agree well with the known published data.

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Original Russian Text © V.V. Veretennikov, A.I. Abramochkin 2009, published in Optica Atmosfery i Okeana.

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Veretennikov, V.V., Abramochkin, A.I. Determination of the optical and microstructural characteristics of water droplet clouds in laser sensing taking into account multiple scattering. Atmos Ocean Opt 22, 527–535 (2009). https://doi.org/10.1134/S1024856009050054

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