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The SCA also uses a combination of observed parameters and information to select an appropriate extinction-to-backscatter ratio, or lidar ratio (Sa for aerosol layers, Sc for clouds), and multiple scattering function, (z), required for retrieving extinction and optical depth.
The lidar ratios and multiple scattering functions are based on the same underlying aerosol or cloud particle model.
Based on this classification according to type, the SCA then estimates values of the lidar ratio, S, for clouds and aerosols, and selects the appropriate range-dependent multiple scattering correction function,
The values determined for lidar ratio and the associated (z) are then passed on to HERA.
The Hybrid Extinction Retrieval Algorithm (HERA) performs extinction retrievals on regions of profile data identified by SIBYL, using lidar ratios and multiple scattering factors supplied by the SCA.
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