DOI: 10.1016/j.atmosenv.2014.02.056
Scopus记录号: 2-s2.0-84896016526
论文题名: Rapid formation of molecular bromine from deliquesced NaBr aerosol in the presence of ozone and UV light
作者: Nissenson P ; , Wingen L ; M ; , Hunt S ; W ; , Finlayson-Pitts B ; J ; , Dabdub D
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 89 起始页码: 491
结束页码: 506
语种: 英语
英文关键词: Aerosol modeling
; Bromide oxidation
; Interface chemistry
; Sea-salt aerosol
; Sensitivity analysis
Scopus关键词: Bromine
; Experiments
; Free radicals
; Ozone
; Photolysis
; Reaction kinetics
; Sensitivity analysis
; Aerosol modeling
; Chamber experiments
; Chemical kinetics model
; Interface chemistry
; Interface reactions
; Marine boundary layers
; Rate-limiting steps
; Sea salt aerosol
; Aerosols
; bromine
; hydroxyl radical
; ozone
; sodium bromide
; aerosol
; aqueous solution
; boundary layer
; bromine
; gas phase reaction
; hydroxyl radical
; molecular analysis
; oxidation
; ozone
; photolysis
; sea salt
; sensitivity analysis
; ultraviolet radiation
; article
; boundary layer
; concentration (parameters)
; controlled study
; dry deposition
; equilibrium constant
; mass spectrometry
; measurement
; molecular dynamics
; pH
; photolysis
; physical phenomena
; priority journal
; secondary organic aerosol
; ultraviolet radiation
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: The formation of gas-phase bromine from aqueous sodium bromide aerosols is investigated through a combination of chamber experiments and chemical kinetics modeling. Experiments show that Br2(g) is produced rapidly from deliquesced NaBr aerosols in the presence of OH radicals produced by ozone irradiated by UV light. The mechanisms responsible for the "bromine explosion" are examined using a comprehensive chemical kinetics Model of Aqueous, Gaseous, and Interfacial Chemistry (MAGIC). A sensitivity analysis on the model confirms that a complex mechanism involving gas-phase chemistry, aqueous-phase chemistry, and mass transfer is responsible for most of the observed bromine. However, the rate-limiting steps in the bromine explosion pathway vary, depending on the availability of ozone and bromide in the system. Interface reactions, an important source of bromine production under dark conditions, account for only a small fraction of total bromine under irradiation. Simulations performed with gaseous ozone and aerosol bromide concentrations typical of the marine boundary layer also show Br2(g) production, with BrO(g) and HOBr(g) as the dominant Br-containing products through this mechanism. Aerosol bromide is depleted after several hours of daylight, with photolysis of BrO(g) and HOBr(g) becoming major sources of Br atoms that continue generating Br2(g) after aerosol bromide is depleted. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81180
Appears in Collections: 气候变化事实与影响
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作者单位: California State Polytechnic University Pomona, Department of Mechanical Engineering, Pomona, CA 91768-4062, United States; University of California Irvine, Department of Chemistry, Irvine, CA 92697-2025, United States; National Center for Environmental Research, United States Environmental Protection Agency, Washington, DC 20460-0001, United States; University of California Irvine, Department of Mechanical and Aerospace Engineering, Irvine, CA 92697-3975, United States
Recommended Citation:
Nissenson P,, Wingen L,M,et al. Rapid formation of molecular bromine from deliquesced NaBr aerosol in the presence of ozone and UV light[J]. Atmospheric Environment,2014-01-01,89