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Optical characteristics and source apportionment of brown carbon in winterPM2.5 over Yulin in Northern China
Lei,YL(Lei,Yali)1,2; Shen, ZX(Shen,Zhenxing)1,2; Wang, QY(Wang, Qiyuan)2; Zhang,T(Zhang,Tian)1; Cao,JJ(Cao,Junji)2; Sun,J(Sun,Jian)1; Zhang,Q(Zhang,Qian)1; Wang, LQ(Wang, Linqing)1; Xu, HM(Xu,Hongmei)1; Tian,J(Tian,Jie)1; Wu,JM(Wu,Jiamin)1; Shen,Zhenxing
2018-11-15
发表期刊Atmospheric Research
卷号213期号:2018页码:27-33
文章类型期刊论文
摘要In this study, daily PM2.5 samples were collected at an urban site in Yulin of Northern China during a winter season. Eight carbon fractions, 13 kinds of polycyclic aromatic hydrocarbons (PAHs), and nine water-soluble ions in PM2.5 were measured. The light-absorption characteristics of brown carbon (BrC) both in water and in methanol extracts were evaluated and quantified. The total quantified PAHs exhibited high concentrations (228.4 ± 52.6 ng m−3), contributing 0.2% of the PM2.5 mass. High indeno[1,2,3-cd]pyrene/(indeno[1,2,3-cd]pyrene + benzo[ghi]-perylene) ratio but low NO3−/SO42− ratio revealed the important contribution of coal combustion to PM2.5. The absorption coefficient (babs) for methanol extracts measured at 365 nm averaged 27.5 ± 12.0 Mm−1. Light absorption by methanol extracts exhibited strong wavelength dependence, with an average absorption Ångström exponent of 5.2 in the 330–400 nm range. The mass absorption cross section (for methanol extracts averaged 1.4 ± 0.4 m2 g−1 by normalizing babs measured at 365 nm to organic carbon mass. A relatively strong positive relationship between babs, methanol and benzo[a]pyrene as well as with six carbon fractions indicated the important contribution of coal burning to BrC. Source apportionment based on the positive matrix factorization receptor model and multiple linear regression showed that residential coal combustion accounted for 37.4% of babs365,methanol. The estimated relative radiative forcing by methanol-soluble organic carbon relative to elemental carbon was 36.9% at 300–400 nm.
关键词Brown Carbon Coal Combustion Source Apportionment
DOI10.1016/j.atmosres.2018.05.018
收录类别SCI
所属项目编号41573101 ; SKLLQG1616 ; xkjc2015002
语种英语
项目资助者National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; a grant from SKLLQG, ChineseAcademy of Sciences ; a grant from SKLLQG, ChineseAcademy of Sciences ; Fundamental ResearchFunding for Central Universities in China ; Fundamental ResearchFunding for Central Universities in China
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文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5329
专题粉尘与环境研究室
通讯作者Shen,Zhenxing
作者单位1.Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
2.Key Lab of Aerosol Chemistry & Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710049, China
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Lei,YL,Shen, ZX,Wang, QY,et al. Optical characteristics and source apportionment of brown carbon in winterPM2.5 over Yulin in Northern China[J]. Atmospheric Research,2018,213(2018):27-33.
APA Lei,YL.,Shen, ZX.,Wang, QY.,Zhang,T.,Cao,JJ.,...&Shen,Zhenxing.(2018).Optical characteristics and source apportionment of brown carbon in winterPM2.5 over Yulin in Northern China.Atmospheric Research,213(2018),27-33.
MLA Lei,YL,et al."Optical characteristics and source apportionment of brown carbon in winterPM2.5 over Yulin in Northern China".Atmospheric Research 213.2018(2018):27-33.
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