Annual cycle in the variability of aerosol microstructure parameters according to solar photometry data

Abstract

Features of the annual behavior of aerosol microstructure parameters retrieved by solving the inverse problem of solar photometry are considered. Hourly average measurements of the aerosol optical depth (AOD) in the spectral range 0.37-4 µm in Tomsk were taken as initial data for the inversion. The exper imental spectra were processed using an algorithm developed based on the integral distribution method. According to the retrieved integral distributions, such microstructure parameters as volume concentration, geometric cross section, and average particle radius are determined. In particular, it is found that the volume concentration of aerosol is minimum in November and maximum in April. In addition, statistical connec tions between the AOD and retrieved microstructure parameters are studied.

Microphysical parameters of smoke aerosols based on the results of inversion of aerosol scattering and extinction coefficients in a big aerosol chamber of IAO SB RAS

“…Measurements of the angular light scattering coefficients (polarization scattering phase functions) ) , ( ), , ( 2 1 and extinction coefficients ( ) were used to determine the microstructure and complex refractive index (CRI) i n m of smoke aerosols. For this purpose, optical measurement inversion algorithms have been developed, in which the integral distribution function S(r) is used to describe the aerosol microstructure, which characterizes the geometric cross section of particles with a radius of at least r in a unit volume of the medium 32 .…”