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Aerosol, being one of the most variable components of the atmosphere, has a significant impact on its radiation balance and the Earth's climate [1][2][3].The magnitude of aerosol radiation forcing is determined by the concentration and optical characteristics of aerosol particles.There are various methods for studying the microphysical and optical characteristics of an aerosol, but the main tools for studying the microstructure of an aerosol in local volumes are particle counters, nephelometers, and polarimeters [4][5]. We present preliminary results of measurements within the seasonal complex aerosol experiment at Zvenigorod Scientific Station (ZSS) located in 38 km west from Moscow in July and August 2020 of the backscatter coefficient D11 using the modernized FAN, as well as the microphysical characteristics of the surface aerosol using laser and optoelectronic aerosol spectrometers. It was revealed that the value of the average D11 is significantly influenced by signal emissions associated with the passage of large particles through the working volume of the device; therefore, the value of the minimum values of D11 was taken as a reference value for further analysis of the statistics of emissions. The value of the contribution of large particles in this case strongly depended on the atmospheric situation.
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