DOI: 10.1016/j.atmosenv.2017.04.016
Scopus记录号: 2-s2.0-85018484311
论文题名: Impact of partitioning and oxidative processing of PAH in fogs and clouds on atmospheric lifetimes of PAH
作者: Eagar J ; D ; , Ervens B ; , Herckes P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 160 起始页码: 132
结束页码: 141
语种: 英语
英文关键词: Chemical lifetimes
; Multiphase chemistry
; PAH
; Polycyclic aromatic hydrocarbons
Scopus关键词: Aromatic compounds
; Aromatic hydrocarbons
; Atmospheric chemistry
; Drops
; Fog
; Gases
; Hydrocarbons
; Atmospheric lifetime
; Chemical inputs
; Condensed phase
; Multiphase model
; Organic particulates
; Oxidation rates
; Polycyclic aromatic hydrocarbons (PAHS)
; Three phase system
; Polycyclic aromatic hydrocarbons
; chemical compound
; hydroxyl radical
; polycyclic aromatic hydrocarbon
; atmospheric chemistry
; atmospheric modeling
; climate conditions
; cloud
; dry deposition
; environmental fate
; fog
; frog
; gas
; oxidation
; PAH
; partitioning
; wet deposition
; Article
; chemical reaction
; chemical sink
; cloud
; dry deposition
; fog
; humidity
; phase partitioning
; photooxidation
; priority journal
; simulation
; water content
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 importance of the atmospheric aqueous phase of fogs and clouds, for the processing and removal of polycyclic aromatic hydrocarbons (PAHs) is not well known. A multiphase model was developed to determine the fate and lifetime of PAHs in fogs and clouds for a limited set of daytime conditions. The model describes partitioning between three phases (aqueous, liquid organic, and gas), experimental and estimated (photo)oxidation rates. Using a limited set of microphysical and chemical input conditions, the loss rates of PAHs in the complex three-phase system are explored. At 25 °C, PAHs with two, three and four rings are predicted to be primarily in the gas phase (fraction in the gas phase xg > 90%) while five- and six-ring PAHs partition significantly into droplets with aqueous phase fractions of 1–6% and liquid organic phase fractions of 31–91%, respectively. The predicted atmospheric chemical lifetimes of PAHs in the presence of fog or cloud droplets (<8 h) are significantly shorter than literature predictions of PAH lifetimes due to wet and dry deposition (1–14 days and 5–15 months, respectively) and shorter than or equal to predicted lifetimes due to chemical reactions in the gas and organic particulate phases (1–300 h). Even though PAH solubilities are ≤4 × 10−2 g L−1, the results of the current study show that often the condensed phase of fog and cloud droplets cannot be neglected as a PAH sink. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82637
Appears in Collections: 气候变化事实与影响
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作者单位: School of Molecular Sciences, Arizona State University, Tempe, AZ, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; NOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, United States
Recommended Citation:
Eagar J,D,, Ervens B,et al. Impact of partitioning and oxidative processing of PAH in fogs and clouds on atmospheric lifetimes of PAH[J]. Atmospheric Environment,2017-01-01,160