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Abstract:
We presented a study of urban aerosol effects in Moscow megacity (55.7N, 37.5E) according to the satellite measurements and mesoscale COSMO-Ru (Rivin et al., 2019) model version 6 with 1 km grid step. The MAIAC/MODIS aerosol optical thickness (AOT) retrievals with 1 km spatial distribution over Moscow (Lyapustin at el., 2018, Zhdanova et al.,2020) were analyzed for the three periods (2001-2006, 2007-2014, 2015-2021) in snowless conditions. These data were normalized according AERONET measurements in Meteorological observatory of Moscow State University and incorporated as input parameters into the COSMO model. For evaluating radiative and temperature effects of urban aerosol we also made simulations with zero aerosol content and with different aerosol climatologies used in COSMO model. The difference between inner-city points and points outside Moscow was 0.02-0.03, according to MISR and MAIAC/MODIS data. According to COSMO calculations, there is an increase in the shortwave net radiation at the Earth's surface by 15-20 W/m2 in 2015-2021 It is shown that in recent years, the air temperature at 2 meters increases by 0.06-0.08 °C, due to the negative trend of aerosol. The radiative and temperature effects of urban aerosol were also evaluated. The work was supported by the Ministry of Education and Science of the Russian Federation (# 075-15-2021-574) and partially by the Federal Service for Hydrometeorology and Environmental Monitoring of Russia topics АААА-А20-120021490060-1.
