ИСТИНА

Urban aerosol pollution has a significant impact on radiation processes in the atmosphere and its meteorological characteristics. For its evaluation over the Moscow region, we used the results of numerical exper-iments using COSMO-ART model with TERRA_URB parameterization which allows taking into account the urban canopy effects at 2 km grid spac-ing as well as modified CAMS/ECLIPSE emissions with the account for their redistribution according to OpenStreetMap data. We obtained sensitivity of radiation and meteorological fields to various scenarios of urban emissions. Testing were fulfilled against the data of Mo-secomonitoring Agency and the AERONET network dataset at the MSU Me-teorological Observatory. Depending on emission rates the urban aerosol op-tical thickness provided negative effective radiative forcing of about 0.9-3.4 Wm-2 for weakly absorbing aerosol at TOA, while its estimates for highly absorbing aerosol on the contrary were positive (up to +2.5 Wm-2). The ap-plication of the TERRA_URB parameterization led to the decrease in surface albedo from 19.1% to 16.9%, which resulted in positive shortwave effective radiative forcing, while for longwave irradiance it is negative but smaller than for shortwave irradiance. The air temperature at 2 m decreases with the increase of both weakly and highly absorbing aerosols at different emission rates. This atmospheric cooling partially compensates for the urban heat island during daytime: the maximum temperature decrease due to aerosol reaches 0.5°C, while the tem-perature increase due to the TERRA_URB scheme for corresponding day-time conditions is 1.5°C. The composite maps of urban aerosol optical depth, radiative and temper-ature effects for clear sky conditions have revealed their localization over the central city area providing a growth in the atmospheric absorption up to 5 Wm-2. The work was supported by the Ministry of Education and Science of the Russian Federation grant No. 075-15-2021-574 and fulfilled within the framework of the MSU scientific and educational school "The Future of the planet and global environmental changes". Numerical experiments with the COSMO model were performed as a part of the Research and technological work of Roshydromet AAAAA20-120021490079-3.