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Distributions of Aerosol Extinction to Backscatter Ratios Derived from Cluster Analysis of AERONET Data

The extinction-to-backscatter ratio (Sa) values and phase functions were calculated from mean properties of aerosol models determined from a statistically significant number of AERONET measurements. Cluster analysis by partitioning was used to categorize the AERONET data set based on several optical and physical characteristics of the aerosol. Using the mean values of the optical and microphysical properties together with the geographic locations, we identified these categories as desert dust, biomass burning, urban industrial pollution, rural background, polluted marine, and dirty pollution.