DOI: 10.1016/j.atmosenv.2016.11.024
Scopus记录号: 2-s2.0-85006021723
论文题名: Optical properties and possible sources of brown carbon in PM2.5 over Xi'an, China
作者: Shen Z ; , Zhang Q ; , Cao J ; , Zhang L ; , Lei Y ; , Huang Y ; , Huang R ; -J ; , Gao J ; , Zhao Z ; , Zhu C ; , Yin X ; , Zheng C ; , Xu H ; , Liu S
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 150 起始页码: 322
结束页码: 330
语种: 英语
英文关键词: Absorption coefficient
; Brown carbon
; Mass absorption coefficient
; Secondary organic carbon
Scopus关键词: Biomass
; Optical properties
; Pelletizing
; Absorption co-efficient
; Aqueous phase reactions
; Biomass burning emissions
; Brown carbons
; Mass absorption coefficient
; Secondary organic carbon
; Water-soluble organic carbon
; Wavelength dependent absorption coefficient
; Organic carbon
; carbon
; levoglucosan
; organic carbon
; absorption coefficient
; ambient air
; biomass burning
; brown carbon
; chemical property
; coal combustion
; concentration (composition)
; optical property
; organic carbon
; pollutant source
; absorption
; Article
; burn
; China
; circadian rhythm
; combustion
; light absorption
; optics
; particulate matter
; priority journal
; seasonal variation
; summer
; China
; Shaanxi
; Xian
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: To quantify optical and chemical properties of PM2.5 brown carbon (BrC) in Xi'an, 58 high-volume ambient PM2.5 samples were collected during 2 November 2009 to 13 October 2010. Mass concentrations of chemical components were determined, including water-soluble ions, water-soluble organic carbon, levoglucosan, organic carbon (OC), and element carbon (EC). BrC, as an unidentified and wavelength-dependent organic compound, was also measured from water-soluble carbon (WSOC) at 340 nm using UV–vis spectrometer. The wavelength-dependent absorption coefficient (babs) and mass absorption coefficient (MAC) were much abundant at 340 nm, and the high Absorption Ångström coefficient (AAC) values were observed around 5.4, corresponding to the existence of BrC in ambient PM2.5, especially in winter. Good correlations (R > 0.60) between babs and biomass burning markers, such as levoglucosan and K+, in winter indicated significant amounts of primary BrC from biomass burning emissions. Secondary organic carbon BrC (SOC[sbnd]BrC) was more abundant in winter than in summer. SOC[sbnd]BrC in winter was mainly fresh SOC formed from aqueous phase reactions while in summer, aged SOC from photo-chemical formation. Source profiles of BrC optical parameters were detected, which verified sources of BrC from biomass burning and coal burning emissions in areas surrounding Xi'an. The rapidly decreasing babs-340nm values from biomass burning smoldering to straw pellet burning suggested that burning straw pellet instead of burning straw directly is an effective measure for reducing BrC emissions. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82261
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, China; Key Lab of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Canada; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China
Recommended Citation:
Shen Z,, Zhang Q,, Cao J,et al. Optical properties and possible sources of brown carbon in PM2.5 over Xi'an, China[J]. Atmospheric Environment,2017-01-01,150