Impacts of aerosol chemical compositions on optical properties in urban Beijing,China

查看全文 作　　者：Ping [1]Tian;Guangfu [1]Wang;Renjian [2,3]Zhang;Yunfei [3]Wu;Peng [4]Yan

机构地区：[1]Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University;[2]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science & Technology;[3]Key Laboratory of Regional Climate-Environment for East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences;[4]Centre for Atmosphere Watch and Services,Meteorological Observation Center of China Meteorological Administration

出　　处：《Particuology》索引2015年第13卷第1期,共10页

基　　金：supported by the National Natural Science Foundation of China(Nos.41175131,41305128);the National Basic Research Program of China(No.2012CB955303);Chinese Public Service Meteorology Special Research(No.GYHY201006047);the Special Scientific Research Funds for Environment Protection Commonweal Section(No.20140902) 摘　　要：The optical properties of aerosols and their chemical composition,including water-soluble ions,organic carbon(OC),and elemental carbon(EC) in PM_(2.5) and PM_(10),were measured from 26 May to 30 June of 2012 at an urban site in Beijing.The daily average concentrations of PM_(2.5) and PM_(10) were 103.2 and 159.6 μg/m^3,respectively.On average,the OC and EC contributed 20.1% and 4.3% ,respectively,to PM_(2.5) and 16.3% and3.9% ,respectively,to PM_(10).Secondary ions(SO_4^(2-),NO_3^-,and NH_4^+) dominated the water-soluble ions and accounted for 57.9% and 62.6% of PM_(2.5) and PM_(10),respectively.The wind dependence of PM_(2.5),OC,SO_4^(2-),and NO_3^- implied that the pollution sources mainly came from south and southeast of Beijing during the summer.The monthly mean values of the scattering coefficient(σ_(sc)) and absorption coefficient(σ_(ab)) at525 nm were 312.9 and 28.7 Mm^(-1),respectively,and the mean single-scattering albedo(ω) was 0.85.The wind dependence of σ_(sc) revealed that this value was mainly influenced by regional transport during the summer,and the relationship between σ_(ab) and wind indicated that a high σ_(ab) resulted from the joint effects of local emissions and regional transport.The reconstructed σ_(sc) that was derived from the revised IMPROVE equation agreed well with the observations.The contribution of different chemical species toσ_(sc) was investigated under different pollution levels,and it was found that secondary inorganic aerosols accounted for a large part of σ_(sc) during pollution episodes(35.7% ),while organic matter was the main contributor to σ_(sc) under clean conditions(33.6% ). 关键词：化学成分气溶胶北京光学性能城市水溶性离子 PM10 中国

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Impacts of aerosol chemical compositions on optical properties in urban Beijing,China

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