DOI: 10.1016/j.atmosenv.2018.01.019
Scopus记录号: 2-s2.0-85041460189
论文题名: Characterization of air pollutant concentrations, fleet emission factors, and dispersion near a North Carolina interstate freeway across two seasons
作者: Saha P ; K ; , Khlystov A ; , Snyder M ; G ; , Grieshop A ; P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 177 起始页码: 143
结束页码: 153
语种: 英语
英文关键词: Dispersion modeling
; Gas-particle partitioning
; Ultrafine particles
; Vehicle emissions
Scopus关键词: Carbon
; Gas emissions
; Nitrogen oxides
; Pollution
; Roads and streets
; Size distribution
; Transportation
; Air pollutant concentrations
; Dispersion modeling
; Gas-particle partitioning
; Meteorological condition
; Pollutant emission factors
; Spatial and temporal patterns
; Ultrafine particle
; Vehicle emission
; Air pollution
; black carbon
; fuel
; nitrogen oxide
; aerosol
; air pollutant
; Article
; chemical composition
; circadian rhythm
; dispersion
; evaporation
; exhaust gas
; highway
; human
; meteorology
; North Carolina
; particle size
; priority journal
; seasonal variation
; sensitivity analysis
; spatiotemporal analysis
; summer
; surface property
; winter
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: We present field measurement data and modeling of multiple traffic-related air pollutants during two seasons at a site adjoining Interstate 40, near Durham, North Carolina. We analyze spatial-temporal and seasonal trends and fleet-average pollutant emission factors and use our data to evaluate a line source dispersion model. Month-long measurement campaigns were performed in summer 2015 and winter 2016. Data were collected at a fixed near-road site located within 10 m from the highway edge, an upwind background site and, under favorable meteorological conditions, along downwind perpendicular transects. Measurements included the size distribution, chemical composition, and volatility of submicron particles, black carbon (BC), nitrogen oxides (NOx), meteorological conditions and traffic activity data. Results show strong seasonal and diurnal differences in spatial distribution of traffic sourced pollutants. A strong signature of vehicle emissions was observed within 100–150 m from the highway edge with significantly higher concentrations during morning. Substantially higher concentrations and less-sharp near-road gradients were observed in winter for many species. Season-specific fleet-average fuel-based emission factors for NO, NOx, BC, and particle number (PN) were derived based on up- and down-wind roadside measurements. The campaign-average NOx and PN emission factors were 20% and 300% higher in winter than summer, respectively. These results suggest that the combined effect of higher emissions and their slower downwind dispersion in winter dictate the observed higher downwind concentrations and wider highway influence zone in winter for several species. Finally, measurements of traffic data, emission factors, and pollutant concentrations were integrated to evaluate a line source dispersion model (R-LINE). The dispersion model captured the general trends in the spatial and temporal patterns in near-road concentrations. However, there was a tendency for the model to under-predict concentrations near the road in the mornings and over-predict concentrations in the evenings. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83050
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Civil, Construction and Environmental Engineering, North Carolina State University, Raleigh, NC, United States; Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States; Institute for the Environment, University of North Carolina at Chapel HillNC, United States
Recommended Citation:
Saha P,K,, Khlystov A,et al. Characterization of air pollutant concentrations, fleet emission factors, and dispersion near a North Carolina interstate freeway across two seasons[J]. Atmospheric Environment,2018-01-01,177