DOI: 10.1016/j.atmosres.2018.05.018
Scopus记录号: 2-s2.0-85048496745
论文题名: Optical characteristics and source apportionment of brown carbon in winter PM2.5 over Yulin in Northern China
作者: Lei Y. ; Shen Z. ; Wang Q. ; Zhang T. ; Cao J. ; Sun J. ; Zhang Q. ; Wang L. ; Xu H. ; Tian J. ; Wu J.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 213 起始页码: 27
结束页码: 33
语种: 英语
英文关键词: Brown carbon
; Coal combustion
; Source apportionment
Scopus关键词: Atmospheric radiation
; Bromine compounds
; Coal
; Factorization
; Light absorption
; Linear regression
; Methanol
; Organic carbon
; Pyrene
; Urban growth
; Water absorption
; Absorption characteristics
; Absorption co-efficient
; Brown carbons
; Multiple linear regressions
; Polycyclic aromatic hydrocarbons (PAHS)
; Positive Matrix Factorization
; Residential coal combustions
; Source apportionment
; Coal combustion
; brown carbon
; coal combustion
; PAH
; particulate matter
; source apportionment
; urban site
; winter
; China
; Shaanxi
; Yulin
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 −/SO4 2− 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. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108777
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Key Lab of Aerosol Chemistry & Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710049, China
Recommended Citation:
Lei Y.,Shen Z.,Wang Q.,et al. Optical characteristics and source apportionment of brown carbon in winter PM2.5 over Yulin in Northern China[J]. Atmospheric Research,2018-01-01,213