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COMPARISON OF SOME ATMOSPHERIC AEROSOL PARAMETERS MEASURED IN MOSCOW WITH MERRA-2 REANALYSIS DATA

The first results of the complicated experiment for studying atmospheric composition in Moscow metropolis in different seasons are considered. The mass concentrations of aerosol particles PM10 and PM2.5, as well as the total aerosol concentration in the surface air of the city center were analyzed for the period of eight months (October 2019 – May 2020). The obtained monthly average values of aerosol concentrations show good correlation with the results of measurements at several stations of Mosecomonitoring system, differences in monthly average values are about 35–40 % and 20–25 %, respectively, from the average values. This is primarily due to various degrees of urbanization, the specifics and intensity of local anthropogenic aerosol sources in different areas of the city, as well as the peculiarities of the circulation regime of the Moscow metropolis. For three consecutive seasons (autumn, winter and spring 2019/2020), the corresponding monthly average mass concentrations were about 24 and 11 μg/m3 for PM10 and PM2.5 aerosols, which is very close to corresponding mass concentrations in the atmosphere of a number of major European cities and lower than the mass concentrations of submicron and micron surface aerosols in the megacities of East Asia. The measurement results are noticeably higher than MERRA-2 reanalysis data. Reanalysis data qualitatively reflect intra-annual variations in the mass concentration of aerosol in the city’s surface air. However, MERRA-2 reanalysis greatly underestimates the level of aerosol pollution in Moscow, from 2 to 12 times in different months for the total aerosol mass or PM2.5 particles.