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Impact of COVID-19 lockdown on the optical properties and radiative effects of urban brown carbon aerosol

Geoscience Frontiers 2022年第6期13卷 291-301页

作者： Yong Zhang Qiyuan Wang Jie Tian Yu Li Huikun Liu Weikang Ran Yongming Han AndréS.H.Prévot Junji Cao State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China Guanzhong Plain Ecological Environment Change and Comprehensive Treatment National Observation and Research Station Xi’an 710061China Xi’an Institute for Innovative Earth Environment Research Xi’an 710061China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Atmospheric Chemistry Paul Scherrer Institute(PSI)Villigen 5232Switzerland

Intensive measurements were conducted in Xi’an,China before and during a COVID-19 lockdown period to investigate how changes in anthropogenic emissions affected the optical properties and radiative effects of brown carbon(BrC)*** contribution of BrC to total aerosol light absorption during the lockdown(13%-49%)was higher compared with the normal period(4%-29%).mass absorption cross-sections(MACs)of specific organic aerosol(OA)factors were calculated from a ridge regression *** the primary OA(POA),coal combustion OA(CCOA)had the largest MACs at all tested wave-lengths during both periods due to high molecular-weight BrC chromophores;that was followed by biomass burning OA(BBOA)and hydrocarbon-like OA(HOA).For secondary OA(SOA),the MACs of the lessoxidized oxygenated OA(OOA)species(LO-OOA)atλ=370-590 nm were higher than those of more-oxidized OOA(MO-OOA)during both periods,presumably due to chromophore *** largest contributor to BrC absorption at the short wavelengths was CCOA during both periods,but BrC absorption by LO-OOA and MO-OOA became dominant at longer wavelengths during the *** estimated radiation forcing efficiency of BrC over 370-600 nm increased from 37.5 W·gduring the normal period to 50.2 W·gduring the lockdown,and that enhancement was mainly caused by higher MACs for both LO-OOA and *** study provides insights into the optical properties and radiative effects of source-specific BrC aerosol when pollution emissions are reduced.

关键词： COVID-19 Brown carbon mass absorption cross-section Radiative effects

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