DOI: 10.1016/j.atmosenv.2017.08.025
Scopus记录号: 2-s2.0-85027706869
论文题名: Evaluation of regional and local atmospheric dispersion models for the analysis of traffic-related air pollution in urban areas
作者: Fallah-Shorshani M ; , Shekarrizfard M ; , Hatzopoulou M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 167 起始页码: 270
结束页码: 282
语种: 英语
英文关键词: Dispersion modelling
; Gaussian puff model
; Nitrogen dioxide
; Street canyon
; Traffic emissions
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: Dispersion of road transport emissions in urban metropolitan areas is typically simulated using Gaussian models that ignore the turbulence and drag induced by buildings, which are especially relevant for areas with dense downtown cores. To consider the effect of buildings, street canyon models are used but often at the level of single urban corridors and small road networks. In this paper, we compare and validate two dispersion models with widely varying algorithms, across a modelling domain consisting of the City of Montreal, Canada accounting for emissions of more 40,000 roads. The first dispersion model is based on flow decomposition into the urban canopy sub-flow as well as overlying airflow. It takes into account the specific height and geometry of buildings along each road. The second model is a Gaussian puff dispersion model, which handles complex terrain and incorporates three-dimensional meteorology, but accounts for buildings only through variations in the initial vertical mixing coefficient. Validation against surface observations indicated that both models under-predicted measured concentrations. Average weekly exposure surfaces derived from both models were found to be reasonably correlated (r = 0.8) although the Gaussian dispersion model tended to underestimate concentrations around the roadways compared to the street canyon model. In addition, both models were used to estimate exposures of a representative sample of the Montreal population composed of 1319 individuals. Large differences were noted whereby exposures derived from the Gaussian puff model were significantly lower than exposures derived from the street canyon model, an expected result considering the concentration of population around roadways. These differences have large implications for the analyses of health effects associated with NO2 exposure. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82207
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil Engineering, University of Toronto, Galbraith Building, 35 St George Street, Toronto, Ontario, Canada
Recommended Citation:
Fallah-Shorshani M,, Shekarrizfard M,, Hatzopoulou M. Evaluation of regional and local atmospheric dispersion models for the analysis of traffic-related air pollution in urban areas[J]. Atmospheric Environment,2017-01-01,167