Light absorption properties and potential sources of brown carbon in Fenwei Plain during winter 2018–2019

查看全文 作　　者：Wenyu [1,2,7]Zhang;Weigang [1,2]Wang;Jie [2,3]Li;Shuangliang [4]Ma;Chaofan [1,2]Lian;Kun [5]Li;Bo [1,2]Shi;Mingyuan [1,2]Liu;Yanyu [2,3]Li;QingQing [2,3]Wang;Yele [2,3]Sun;Shengrui [1,2]Tong;Maofa [1,2,6]Ge

机构地区：[1]State Key Laboratory for Structural Chemistry of Unstable and Stable Species,Beijing National Laboratory for Molecular Sciences(BNLMS),Chemistry Academy of Sciences Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;[2]University of Chinese Academy of Sciences,Beijing 100049,China;[3]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;[4]Henan Environmental Monitoring Center Station,Zhengzhou 450000,China;[5]Laboratory of Atmospheric Chemistry,Paul Scherrer Institute(PSI),Villigen 5232,Switzerland;[6]Center for Excellence in Regional Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China;[7]Department of Clinical Research,Central Hospital Affiliated to Shandong First Medical University,Jinan 250013,China

出　　处：《Journal of Environmental Sciences》索引2021年第33卷第4期,共11页

基　　金：supported by The National Key Research and Development Program of China(No.2017YFC0209500);the National Natural Science Foundation of China(Nos.91744204,41822703,and 91844301);National research program for key issues in air pollution control(No.DQGG-0103)。 摘　　要：A distinctive kind of organic carbon aerosol that could absorb ultraviolet-visible radiation is called brown carbon(Br C),which has an important positive influence on radiative budget and climate change.In this work,we reported the absorption properties and potential source of Br C based on a seven-wavelength aethalometer in the winter of 2018–2019 at an urban site of Sanmenxia in Fenwei Plain in central China.Specifically,the mean value of Br C absorption coefficient was 59.6±36.0 Mm^(-1) at 370 nm and contributed 37.7%to total absorption,which made a significant impact on visibility and regional environment.Absorption coefficients of Br C showed double-peak pattern,and Br C had shown small fluctuations under haze days compared with clean days.As for the sources of Br C,Br C absorption coefficients expressed strong correlations with element carbon aerosols and primary organic carbon aerosols,indicating that most of Br C originated from primary emissions.The linear correlations between trace metal elements(K,As,Fe,Mn,Zn,and Pb)and Br C absorption coefficients further referred that the major sources of Br C were primary emissions,like coal burning,biomass burning,and vehicle emissions.The moderate relationship between Br C absorption coefficients and secondary organic aerosols suggested that secondary production of Br C also played an important role.The 120 hr backward air mass trajectories analysis and concentration-weighted trajectories analysis were also used to investigate potential sources of Br C in and around this area,which inferred most parts of Br C were derived from local emissions. 关键词：Brown carbon Light absorption Potential source analysis Fenwei Plain

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Light absorption properties and potential sources of brown carbon in Fenwei Plain during winter 2018–2019

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