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The biggest impact of wave COVID-19 response on black carbon in Moscow megacity relates to out-of-city migration during self-isolationтезисы доклада
- Авторы: Chichaeva M., Popovicheva O., Kovach R., Zhdanova E., Kasimov N.
- Сборник: European Aerosol Conference 2023 (EAC2023)
- Тезисы
- Год издания: 2023
- Место издания: Malaga
- Первая страница: Poster−1: 2.10#8
- Аннотация: Globally, effects of COVID-19 lockdown on pollution levels are evidenced. In Russia, the first social distancing and mandatory quarantines were introduced in April 2020. After first lockdown, waves of the COVID-19 pandemic have surged through communities; the world has experienced how to endure lockdowns and a shakeup of economics, employment force, and resources. Black carbon (BC) has become one of the most significant indicators of the pandemic environment impacts. Its emissions declined 11% during lockdowns over Europe, as compared to the same period in previous 5 years (Evangeliou et al., 2021). Changes were different in cities with major contributions from non-traffic related sources. How significant they occurred due to different economic and population activity is still uncertain. Moscow is the most densely populated northernmost megacity in Europe. Aerosol black carbon (ВС) of megacity background is investigated at Aerosol Complex located in Metrological Observatory Moscow State University, during Covid-19 lockdown and recovery periods of 2020 (Popovicheva et al., 2021). Wave of COVID-19 followed the first one; the record for a number of cases per day, 9108, was broken on 18 June 2021 during the third pandemic wave (Fig.1), leaving a need to estimate the impact of various levels of restrictions. Effects of changes in traffic, economic and population activities in conjunction with meteorological parameters are evaluated by studying the variability, diurnal and weekly trends as well as air mass transportation of source - specific BC components and PM10 in spring - summer 2020 and the same time in 2021. The decrease of traffic and industrial enterprise emissions during lockdown in spring 2020 was determined. PM10 and eBC concentrations increase in the recovery period verses lockdown, experienced by 17% and 77% (Fig.2) that is the major consequence of traffic and population activity recovery in summer 2020. While fossil fuel (FF) impact was decreased during LP, high BB contribution to BC (BB%) up to 25 % was found (Fig.2) in a megacity where biomass does not used by population for heating or other type of activity because the centralized heating system operated in a cold season. Such the biggest impact is associated with Moscow citizen migration to suburban during strong lockdown self-isolation restrictions. In the same time in 2021, the pandemic wave had less impact on air pollution in Moscow megacity, and almost absence for BB% (Fig.2) because less strong remote work format for restrictions was introduced. Thus, source-specific BC components act as an indicator of traffic, industrial, central and regional residential heating emissions as well as wildfires in surroundings areas, they clarify how a strength of restriction measures during COVID-19 waves impacted on air pollution in Moscow.This work was supported by the RF Ministry of Science and Higher Education (075-15-2021-574).
- Добавил в систему: Чичаева Марина Александровна