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题名: Optical characteristics and source apportionment of brown carbon in winterPM2.5 over Yulin in Northern China
作者: 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
通讯作者: Shen,Zhenxing
关键词: Brown carbon ;  Coal combustion ;  Source apportionment
刊名: Atmospheric Research
发表日期: 2018-11-15
DOI: 10.1016/j.atmosres.2018.05.018
卷: 213, 期:2018, 页:27-33
收录类别: SCI
文章类型: 期刊论文
英文摘要: 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.
语种: 英语
所属项目编号: 41573101 ;  SKLLQG1616 ;  xkjc2015002
项目资助者: National Natural ScienceFoundation of China ;  a grant from SKLLQG, ChineseAcademy of Sciences ;  Fundamental ResearchFunding for Central Universities in China
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内容类型: 期刊论文
URI标识: http://ir.ieecas.cn/handle/361006/5329
Appears in Collections:粉尘与环境研究室_期刊论文

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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

Recommended Citation:
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.
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