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Optical characteristics and source apportionment of brown carbon in winter PM2.5 over Yulin in Northern China
Lei, Yali1,2; Shen, Zhenxing1,2; Wang, Qiyuan2; Zhang, Tian1; Cao, Junji2; Sun, Jian1; Zhang, Qian1; Wang, Linqing1; Xu, Hongmei1; Tian, Jie1; Wu, Jiamin1
2018-11-15
发表期刊ATMOSPHERIC RESEARCH
卷号213期号:5页码:27-33
文章类型Article
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 (b(abs)) 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 Angstrom exponent of 5.2 in the 330-400 nm range. The mass absorption cross section (for methanol extracts averaged 1.4 +/- 0.4 m(2)g(-1) by normalizing b(abs) measured at 365 nm to organic carbon mass. A relatively strong positive relationship between b(abs, 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 b(abs365,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
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.atmosres.2018.05.018
关键词[WOS]SOLUBLE ORGANIC-CARBON ; MASS ABSORPTION EFFICIENCY ; LIGHT-ABSORPTION ; PARTICULATE MATTER ; ELEMENTAL CARBON ; CHEMICAL CHARACTERISTICS ; VISIBILITY IMPAIRMENT ; SPECTRAL DEPENDENCE ; AEROSOL COMPOSITION ; SIZE DISTRIBUTION
收录类别SCI
语种英语
WOS研究方向Meteorology & Atmospheric Sciences
WOS类目Meteorology & Atmospheric Sciences
WOS记录号WOS:000442169800003
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5115
专题粉尘与环境研究室
作者单位1.Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Shaanxi, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Key Lab Aerosol Chem & Phys, Xian 710049, Shaanxi, Peoples R China
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Lei, Yali,Shen, Zhenxing,Wang, Qiyuan,et al. Optical characteristics and source apportionment of brown carbon in winter PM2.5 over Yulin in Northern China[J]. ATMOSPHERIC RESEARCH,2018,213(5):27-33.
APA Lei, Yali.,Shen, Zhenxing.,Wang, Qiyuan.,Zhang, Tian.,Cao, Junji.,...&Wu, Jiamin.(2018).Optical characteristics and source apportionment of brown carbon in winter PM2.5 over Yulin in Northern China.ATMOSPHERIC RESEARCH,213(5),27-33.
MLA Lei, Yali,et al."Optical characteristics and source apportionment of brown carbon in winter PM2.5 over Yulin in Northern China".ATMOSPHERIC RESEARCH 213.5(2018):27-33.
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