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Major ions and potentially toxic elements in atmospheric precipitation during the COVID-19 lockdown in Moscow megacityстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Vlasov Dmitry, Kasimov Nikolay, Eremina Irina, Shinkareva Galina, Chubarova Natalia
- Журнал: Urban Climate
- Том: 48
- Год издания: 2023
- Номер статьи: 101422
- DOI: 10.1016/j.uclim.2023.101422
- Аннотация: For the first time, the change in the physicochemical properties, ions composition, concentrations,and ratio of soluble and insoluble potentially toxic elements (PTEs), as well as sources contributionto the content of PTEs using principal component analysis with multiple linear regression(PCA-MLR) were determined in the Moscow precipitation before, during and after the lockdown(January–July 2020). The impact of the lockdown on the precipitation composition was ambivalent.The decrease in the precipitation pollution with PTEs (by 10–99% for soluble PTEs and9–61% for insoluble ones) was caused by the purification of the atmosphere from aerosols duringtheir long-term washing out by precipitation and a decrease in anthropogenic emissions. Airadvection to Moscow from the suburbs, where wood, coal, household and agricultural wasteswere burned, on the contrary, contributed to the growth of precipitation pollution with insolubleP, Pb, Cd, soluble P, Ag, Pb, Sb, As, Cd, as well as [Cl ] and [K+]. After the lockdown, therestoration of the level of precipitation pollution by PTEs occurred gradually due to the time lagbetween the increase in atmospheric pollution and the washing out of aerosols by precipitation, aswell as dilution by exceptional rainfall amount. Faster restoration rates of insoluble PTEscompared to soluble ones are associated with the rapid increase in the activity of the urban source(road and construction dust, industrial and traffic emissions). The lifting lockdown restrictionsreduced the contribution of industrial sources to the content of soluble PTEs forms (from 38–66%to 6%) due to an increase in the contribution of road dust and non-exhaust emissions, soil particlesresuspension, waste and fuel combustion, and vehicle emissions. A decrease in the contributionof vehicle emissions, road dust resuspension, and construction dust to the content ofinsoluble PTEs from winter to summer due to the lockdown influence and a large amount ofprecipitation in late spring and early summer was confirmed. The results highlighted the need forfurther studies of the chemical composition and properties of precipitation in the city in similarperiods for the correct separation of the influence of social, economic, emission, meteorological,and physicochemical factors on the content and the ratio of PTEs forms.
- Добавил в систему: Чубарова Наталья Евгеньевна