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The Optical and Microphysical Characteristics of the Smoke Aerosol in the Moscow Region During the Summer-Autumn of 2002

Gorchakov, G.I.(a), Golitsyn, G.S.(a), Anikin, P.P.(a), Emilenko, A.S.(a), Isakov, A.A. (a), Kopeikin, V.M.(a), Rublev, A.N.(b), Sviridenkov, M.A.(a), and Shukurov, K.A.(a), A.M.Obukhov Institute of Atmospheric Physics, RAS (a), Russian Research Center "Kurchatov Institute" (b)
Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting

Observational results will be presented for the optical and microphysical characteristics of the smoke aerosol produced by wild fires at peatbogs in the Moscow region during the July-September of 2002. Characteristics in the visual range and mass concentration of the submicron aerosol had been measured both in the Moscow city and in the Moscow region using nephelometers. The aerosol particle size distribution function and the smoke aerosol refraction index in the near surface layer were calculated using the data for the spectral function of components of the light scattering matrix. The aerosol microstructure in the atmosphere column was determined using both measuring data of spectral functions of aerosol optical depth and solar aureole phase function. Aerosol sampling was carried out to determine its absorption and chemical element composition. It is shown, that the microstructure of the smoke aerosol during the wild fires at peatbog in July-August of 2002 is similar to the one at a biomass burning. The absorption of this smoke aerosol is less than the one produced both at forest fire and at savanna fire. In September of 2002 the aerosol particle size distribution function was broaden and, in some cases, bimodal. The condensation activity of the smoke aerosol was relatively high. It is found out that chemical composition of the smoke aerosol transforms noticeably during transfer of an air mass above the pollution source. The influence of variation of the smoke aerosol microstructure the radiation regime of atmosphere was analyzed. This work presents new data on the influence of the aerosol from the biomass burning on the solar radiation.

Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).