Urban air quality modeling with full O3-NOx-VOC chemistry: Implications for O3 and PM air quality in a street canyon

被引:84
作者
Kim, Minjoong J. [1 ]
Park, Rokjin J. [1 ]
Kim, Jae-Jin [2 ]
机构
[1] Seoul Natl Univ, Atmospher Chem Modeling Lab, Sch Earth & Environm Sci, Seoul 151747, South Korea
[2] Pukyong Natl Univ, Dept Environm Atmospher Sci, Pusan 608737, South Korea
关键词
Street canyon; Urban pollution; Air quality; CFD; LARGE-EDDY SIMULATION; EPSILON TURBULENCE MODEL; POLLUTANT DISPERSION; WIND DIRECTION; BOX MODEL; FLOW; OZONE; EMISSIONS; PHOTOLYSIS; TRANSPORT;
D O I
10.1016/j.atmosenv.2011.10.059
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
We examine transport and chemical transformation of reactive pollutants on an urban street using a computation fluid dynamics (CFD) model coupled with full photochemistry of reactive pollutants. An extensive comparison between simulated results and observations is conducted to evaluate the model, focusing on a field campaign occurred in Dongfeng Middle Street in Guangzhou, China. Observed CO and NO concentrations vary diurnally following traffic volumes. The model captures this observed diurnal variation and magnitudes of CO concentrations successfully. However, simulated NO concentration is three times higher than observation. This high bias is significantly reduced in the sensitivity simulation with lower NOx emissions. We find that oxidation products of O-3 photochemistry such as NO2 and O-3 vary differently from primary pollutants, indicating important effects of photochemical reactions on their fates. The model appears to reproduce observed O-3 and NO2 variability with time and altitude. Our analysis shows that high NO concentrations in the urban street canyon may efficiently produce aerosol nitrate in the presence of NH3. Simulated inorganic NOT aerosol concentration reaches up to 0.3 mg in July but increases an order of magnitude higher at lower temperature that favors partitioning of gasphase HNO3 to aerosol-phase, implying a serious concern for urban air quality in winter. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:330 / 340
页数:11
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