Wildfires significantly enhance light absorption of black carbon and brown carbon aerosols in Moscow urban atmosphere

Xie, F.; Cao, F.; Popovicheva, O.; Huang, Z.; Chichaeva, M.; Lin, Y.; Song, W.; Kovach, R.; Zavgorodnyaya, Y.; Wu, C.; Kasimov, N.; Zhang, Y.

Авторы: Xie Feng, Cao Fang, Popovicheva Olga, Huang Ze-Liang, Chichaeva Marina, Lin Yu-Chi, Song Wen-Huai, Kovach Roman, Zavgorodnyaya Yulia, Wu Chang-Liu, Kasimov Nikolay, Zhang Yan-Lin
Журнал: Sustainable Horizons
Том: 17
Год издания: 2026
Издательство: Elsevier Inc.
Местоположение издательства: США
Номер статьи: 100169
DOI: 10.1016/j.horiz.2025.100169
Аннотация: Large-scale wildfires are essential sources of black carbon (BC) and brown carbon (BrC), affecting aerosolinducedradiative forcing. This study investigated the impact of two wildfire plumes (Plume 1 and 2) transportedto Moscow on the optical properties of BC and BrC during August 2022. During the wildfires, the totallight absorption at 370 nm (babs_370nm) increased 2.3–3.4 times relative to background (17.30 ± 13.98 Mm􀀀 1),and the BrC contribution to total absorption increased from 14 % to 42–48 %. BrC was further partitioned intoprimary (BrCPri) and secondary (BrCSec) components. Biomass burning accounted for ~83–90 % of BrCPri duringthe wildfires. The babs_370nm of BrCPri increased 5.6 times in Plume 1 and 11.5 times in Plume 2, due to the higherprevalence of peat combustion in Plume 2. babs_370nm of BrCSec increased 8.3–9.6 times, driven by aqueous-phaseprocessing, as evidenced by strong correlations between aerosol liquid water content and babs_370nm of BrCSec.Daytime babs_370nm of BrCSec increased 7.6 times in Plume 1 but only 3.6 times in Plume 2, due to more extensivephotobleaching, as indicated by negative correlations with oxidant concentrations and longer transport times.The radiative forcing of BrCPri relative to BC increased 1.8 times in Plume 1 and Plume 2. In contrast, this increasefor BrCSec was 3.4 times in Plume 1 but only 2.3 times in Plume 2, due to differences in chemical processes,which may result in higher uncertainty in its radiative forcing. Future work should prioritize elucidating both theemissions and atmospheric processes to better quantify wildfire-derived BrC and its radiative forcing.
Добавил в систему: Поповичева Ольга Борисовна

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Wildfires significantly enhance light absorption of black carbon and brown carbon aerosols in Moscow urban atmosphereстатья

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