Dynamics of aerosol absorption characteristics in smoke combustion of forest biomass burning at the large aerosol chamber at the stages of generation and aging in time

In the Large Aerosol Chamber of the IOA (LAC) in 2020, complex measurements were made of the spectral coefficients of aerosol attenuation at wavelengths 0.45-3.9 microns, angular scattering (nephelometer) and absorption (multi - wave aetalometry) - 0.46, 0.53, 0.59, 0.63 microns in pine combustion fumes. Investigated the variability of the optical and microphysical characteristics of aerosols at the stage of smoke formation, depending on the value of the mass mixing parameter for the modes of flame combustion (generation of black carbon microparticles) and smoldering combustion (brown carbon particles), the total mass of the material. The dynamics of the characteristics of fumes under 2-day aging under dark conditions and under the influence of ultraviolet radiation in the wavelength range of 300-400 nm is analyzed. Aerosol measurements were accompanied by sampling of particles on aerosol filters to determine the concentrations of elemental EC and organic carbon OS in the smoke aerosol by gas chromatography. For the studied pyrolysis and mixed combustion fumes, the spectral dependences of the aerosol attenuation and absorption coefficients, the mutual relationship of the aerosol attenuation, scattering and absorption coefficients are analyzed. Estimates of the variability of the adsorption parameters of Angstrom and the specific mass concentration of brown carbon in the combustion fumes of LGM are obtained, which are important for comparison with the data of satellite sounding of the fumes of Siberian forest fires.