DOI: 10.1016/j.atmosenv.2017.06.027
Scopus记录号: 2-s2.0-85021150005
论文题名: NO to NO2 conversion rate analysis and implications for dispersion model chemistry methods using Las Vegas, Nevada near-road field measurements
作者: Kimbrough S ; , Chris Owen R ; , Snyder M ; , Richmond-Bryant J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 165 起始页码: 23
结束页码: 34
语种: 英语
英文关键词: Air pollution
; Motor vehicle emissions
; Near-source
; NO
; NO2
; NOX
Scopus关键词: Air pollution
; Atmospheric chemistry
; Nitrogen
; Nitrogen compounds
; Nitrogen oxides
; Nobelium
; Roads and streets
; Ambient measurement
; Atmospheric mixing
; Dispersion modeling
; Field measurement
; Mechanical process
; Motor vehicle emissions
; Near sources
; Spatial gradients
; Chemical analysis
; nitrogen dioxide
; nitrogen oxide
; ozone
; ambient air
; atmospheric chemistry
; atmospheric modeling
; atmospheric pollution
; dispersion
; field method
; mixing
; nitrogen oxides
; nitrous oxide
; ozone
; pollutant source
; roadside environment
; traffic emission
; air monitoring
; air quality
; ambient air
; Article
; atmospheric dispersion
; boundary layer
; chemical reaction
; circadian rhythm
; concentration (parameters)
; exhaust gas
; highway
; kernel method
; measurement
; mechanics
; meteorology
; Nevada
; priority journal
; traffic and transport
; Las Vegas
; Nevada
; United States
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 nitrogen dioxide/oxides of nitrogen (NO2/NOX) ratio is an important surrogate for NO to NO2 chemistry in dispersion models when estimating NOX impacts in a near-road environment. Existing dispersion models use different techniques and assumptions to represent NO to NO2 conversion and do not fully characterize all of the important atmospheric chemical and mechanical processes. Thus, “real-world” ambient measurements must be analyzed to assess the behavior of NO2/NOX ratios near roadways. An examination of NO2/NOX ratio data from a field study conducted in Las Vegas, Nevada (NV), from mid-December, 2008 through mid-December, 2009 provides insights into the appropriateness of assumptions about the NO2/NOX ratio included in dispersion models. Data analysis indicates multiple factors affect the downwind NO2/NOX ratio. These include spatial gradient, background ozone (O3), source emissions of NO and NO2, and background NO2/NOX ratio. Analysis of the NO2/NOX ratio spatial gradient indicates that under high O3 conditions, the change in the ratio is fairly constant once a certain O3 threshold (≥30 ppb) is reached. However, under low O3 conditions (<30 ppb), there are differences between weekdays and weekends, most likely due to a decline in O3 concentrations during the weekday morning hours, reducing the O3 available to titrate the emitted NO, allowing lower NO2/NOX ratios. These results suggest that under high O3 conditions, NOX chemistry is driving the NO2/NOX ratios whereas under low O3 conditions, atmospheric mixing is the driving factor. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82389
Appears in Collections: 气候变化事实与影响
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作者单位: U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, 109 TW Alexander Dr., RTPNC, United States; U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, 109 TW Alexander Dr., RTPNC, United States; University of North Carolina, Institute for the Environment, Center for Environmental Modeling for Policy Development, 100 Europa Dr., Chapel Hill, NC, United States; U.S. Environmental Protection Agency, Office of Research and Development, National Center for Environmental Assessment, 109 TW Alexander Dr., RTPNC, United States
Recommended Citation:
Kimbrough S,, Chris Owen R,, Snyder M,et al. NO to NO2 conversion rate analysis and implications for dispersion model chemistry methods using Las Vegas, Nevada near-road field measurements[J]. Atmospheric Environment,2017-01-01,165