DOI: 10.1016/j.atmosenv.2014.02.022
Scopus记录号: 2-s2.0-84896875035
论文题名: A yearlong study of water-soluble organic carbon in Beijing II: Light absorption properties
作者: Du Z ; , He K ; , Cheng Y ; , Duan F ; , Ma Y ; , Liu J ; , Zhang X ; , Zheng M ; , Weber R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 89 起始页码: 235
结束页码: 241
语种: 英语
英文关键词: Biomass burning
; Brown carbon
; Light absorption
; WSOC
Scopus关键词: Biomass-burning
; Brown carbons
; Fine particulate matter
; Positive matrix factorization models
; Temporal and spatial variation
; Water-soluble organic carbon
; Wavelength dependence
; WSOC
; Biomass
; Carbon
; Oxalic acid
; Light absorption
; levoglucosan
; organic carbon
; oxalic acid
; sulfate
; unclassified drug
; water soluble organic carbon
; absorbance
; aerosol composition
; air sampling
; anthropogenic source
; biogenic emission
; biomass burning
; organic carbon
; particulate matter
; spatiotemporal analysis
; article
; biomass
; burn
; China
; falling
; light absorption
; particulate matter
; precursor
; priority journal
; seasonal variation
; spatial analysis
; summer
; United States
; winter
; Beijing [China]
; China
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: Light absorption properties of water-soluble organic carbon (WSOC) in Beijing were investigated by 24h-averaged fine particulate matter (PM2.5) samples collected from October 2010 to November 2011. The light absorption spectra of WSOC exhibited strong wavelength dependence such that the absorption Ångstrom exponent was approximately 7.5. The light absorption at 365nm (Abs365), which is typically used as a proxy of water-soluble brown carbon, was found to correlate strongly with WSOC (R2>0.75, p<0.01). Moreover, the correlation between Abs365 and levoglucosan (especially in fall and winter) indicated that biomass burning could contribute significantly to water-soluble brown carbon. Source apportionment with Positive Matrix Factorization (PMF) model showed that biomass burning and mixed sources contributed 58.0% and 20.8% to total Abs365, compared with 21.2% from WSOC associated with sulfate and oxalate. The mass absorption efficiency (MAE) of WSOC in Beijing showed distinct temporal variations (averaging 1.26m2/g and 0.51m2/g during winter and summer, respectively), and was approximately 2-3 times the values of that observed in the southeastern United States, but was substantially lower than the summertime results from Los Angeles. Influence factors responsible for the temporal and spatial variations of MAE were investigated. MAE were calculated for each PMF factor. It was found that the MAE for WSOC from biomass burning (1.19m2/g) and mixed primary sources (2.89m2/g) was much higher than that of WSOC associated with sulfate or oxalate (0.32-0.33m2/g) in Beijing. In addition, it was concluded that differences in the precursors of WSOC might also be responsible for the observed variation of MAE such that WSOC associated with anthropogenic precursors are more light-absorbing compared with WSOC biogenic sources. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80658
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China; State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing, China; Collaborative Innovation Center for Regional Environmental Quality, China; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Department of Civil and Environmental Engineering, University of California, Davis, CA, United States
Recommended Citation:
Du Z,, He K,, Cheng Y,et al. A yearlong study of water-soluble organic carbon in Beijing II: Light absorption properties[J]. Atmospheric Environment,2014-01-01,89