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The joint hydrodynamic model of mesoscale atmospheric processes and transfer of multicomponent gas admixtures and aerosols in the atmosphere is considered taking into account the photochemical transformation, nucleation, condensation/evaporation, and coagulation. Numerical calculations have been performed for given levels of emissions of gas admixtures and aerosols from combustion sources. The paper also describes the mechanisms of formation of organic substances in the atmosphere and their transition into a condensed phase and back, which leads to formation of organic aerosol. The spatio-temporal variability of concentrations of gas admixtures of natural and anthropogenic origin is studied in the case of combustion of biomass from forest and peat fires. Based on the results of numerical calculations, the variability of concentration of an organic aerosol is studied depending on the spectrum of particle sizes.

Dynamics of gas admixtures and aerosols in forest and peat fires