Retrieval of microstructure parameters of coarse-mode aerosol using their regression relationships with spectral extinction of light in the IR

We explore how the microstructure parameters of atmospheric aerosol can be estimated from regression equations that describe their relationships with spectral measurements of the aerosol optical depth (AOD). Special attention is paid to the problem of estimating the volume concentration, total cross section, and mean radius of coarse aerosol particles. This problem is topical because of large errors arising when an insufficiently wide spectral range of measurements is available to retrieve these parameters using directly the AOD inversion. Estimates of the coefficients of simple and multiple linear regressions are presented together with the results of their use to retrieve the parameters of coarse-mode aerosol from data of sun photometer measurements in Tomsk.