DOI: 10.1016/j.atmosenv.2015.05.013
Scopus记录号: 2-s2.0-84929336901
论文题名: Field observation on secondary organic aerosols during Asian dust storm periods: Formation mechanism of oxalic acid and related compounds on dust surface
作者: Wang G ; , Cheng C ; , Meng J ; , Huang Y ; , Li J ; , Ren Y
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 113 起始页码: 169
结束页码: 176
语种: 英语
英文关键词: Aqueous-phase oxidation
; Carbonyls
; Dicarboxylic acid
; Nitrate
; Size distribution
; Sulfate
Scopus关键词: Aerosols
; Calcium
; Dust
; Nitrates
; Nitrogen
; Nitrogen oxides
; Organic acids
; Size distribution
; Storms
; Water absorption
; Water vapor
; Aqueous phase oxidations
; Carbonyls
; Dicarboxylic acid
; Heterogeneous formation
; Molecular compositions
; Secondary organic aerosols
; Sulfate
; Water-vapor absorption
; Oxalic acid
; carboxylic acid
; dicarboxylic acid
; glyoxal
; methylglyoxal
; oxalic acid
; aerosol property
; aqueous solution
; carboxylic acid
; chemical composition
; dust
; oxidation
; storm
; water vapor
; Article
; China
; controlled study
; dust
; mass fragmentography
; meteorology
; molecular weight
; physical chemistry
; priority journal
; secondary organic aerosol
; stereoisomerism
; surface property
; water vapor
; China
; Far East
; 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: Chemical evolution of East Asian dust during transpacific transport has been given much attention for inorganic species such as sulfate, nitrate and ammonium. However, the role of organic species during the transport has almost entirely been ignored. To understand the formation mechanism of secondary organic aerosols (SOA) on dust surfaces, this study investigated the concentrations and compositions of dicarboxylic acids, keto-carboxylic acids, α-dicarbonyls and inorganic ions in size-segregated aerosols (9-stages) collected in Xi'an, central China during the two dust storm episodes in the springs of 2009 and 2011 and compared with those in nondust storm periods. During the events the ambient particulate dicarboxylic acids were 932-2240 ng m-3, which are comparable and even higher than those in nondust periods. Molecular compositions of the above SOA are similar to those in nondust periods with oxalic acid being the leading species. In the presence of the dust storms, all the above mentioned SOA species in Xi'an were predominantly enriched on the coarse particles (>2.1 μm), and oxalic acid well correlated with NO3 - (R2 = 0.72, p < 0.001) rather than SO4 2-. This phenomenon differs greatly from the SOA in any other nondust period that is usually characterized by an enrichment of oxalic acid in fine mode and a strong correlation of oxalic acid with SO4 2-. We propose a formation pathway to explain these observations, in which nitric acid and/or nitrogen oxides react with dust to produce Ca(NO3 )2 and form a liquid phase on the surface of dust aerosols via water vapor-absorption of Ca(NO3 )2 , followed by a partitioning of the gas-phase water-soluble organic precursors (e.g.,glyoxal and methylglyoxal) into the aqueous-phase and a subsequent oxidation into oxalic acid. To the best of our knowledge, we found for the first time the enrichment of glyoxal and methylglyoxal on dust surface. Our data suggest an important role of nitrate in the heterogeneous formation process of SOA on the surface of dust. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82104
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an, China; University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Wang G,, Cheng C,, Meng J,et al. Field observation on secondary organic aerosols during Asian dust storm periods: Formation mechanism of oxalic acid and related compounds on dust surface[J]. Atmospheric Environment,2015-01-01,113