DOI: 10.1016/j.atmosenv.2015.08.010
Scopus记录号: 2-s2.0-84939799375
论文题名: Instantaneous nitric oxide effect on secondary organic aerosol formation from m-xylene photooxidation
作者: Li L ; , Tang P ; , Cocker D ; R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 119 起始页码: 144
结束页码: 155
语种: 英语
英文关键词: Aromatic hydrocarbon
; Kinetic modeling
; NOx
; Radicals
; Secondary organic aerosol
Scopus关键词: Aerosols
; Aromatic compounds
; Aromatization
; Data mining
; Environmental chambers
; Hydrocarbons
; Nitric oxide
; Photooxidation
; Reaction kinetics
; Xylene
; Chamber experiments
; Hydroxyl radicals
; Kinetic modeling
; NO concentration
; Radical concentration
; Radicals
; Secondary organic aerosols
; Strong correlation
; Aromatic hydrocarbons
; aromatic hydrocarbon
; nitric oxide
; xylene
; aerosol
; aromatic hydrocarbon
; concentration (composition)
; experimental study
; hydroxyl radical
; nitrogen oxides
; oxidation
; radical
; Article
; atmosphere
; chemical model
; data mining
; gas
; growth curve
; photooxidation
; priority journal
; rate constant
; secondary organic aerosol
; urban area
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: Secondary organic aerosol (SOA) formation from aromatic hydrocarbon photooxidation is highly sensitive to NO concentration. The instantaneous effect of NO on SOA formation from m-xylene photooxidation is investigated in this work by data mining 10 years of aromatic hydrocarbon chamber experiments conducted in the UC Riverside/CE-CERT chamber. First, the effect of sub-ppb NO concentrations on SOA formation is explored. The relationship of SOA growth rate to 1) NO2/NO ratio; 2) instantaneous HC/NO; 3) absolute NO concentration; 4) peroxy radical reaction branching ratio and 5) hydroxyl radical concentration are illustrated. Second, continuous and stepwise NO, NO2 and HONO injection are applied to m-xylene photooxidation experiments to simulate continuous NO sources in an urban area. The influence of these reaction scenarios on radical concentrations and SOA formation is explored. [HO2]/[RO2] shows a strong correlation with SOA yields in addition to [OH]/[HO2], [OH], [HO2] and [RO2]. Enhanced SOA formation is observed when low NO levels (<1 ppb) are artificially maintained by continuous or step-wise injection; consistent with earlier research, SOA formation is observed to be suppressed by large initial NO injections. It is proposed that NO at sub-ppb level enhances OH formation increasing HO2 and RO2 and therefore promoting SOA formation. Further, two NO pathways (one promoting and one suppressing SOA formation) and one extremely low NO phase (NO "free") are used to demonstrate the evolution of NO impact on SOA formation during photooxidation. This study implies that SOA yields from aromatic hydrocarbon and low NOx photooxidation is previously underestimated due to differences between traditional environmental chamber experiments and atmospheric reactivity. © 2015 Published by Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81570
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: University of California, Riverside, Department of Chemical and Environmental Engineering, Riverside, CA, United States; College of Engineering-Center for Environmental Research and Technology (CE-CERT), Riverside, CA, United States; South Coast Air Quality Management District, Diamond Bar, CA, United States
Recommended Citation:
Li L,, Tang P,, Cocker D,et al. Instantaneous nitric oxide effect on secondary organic aerosol formation from m-xylene photooxidation[J]. Atmospheric Environment,2015-01-01,119