Large eddy simulation of shading effects on NO2 and O3 concentrations within an idealised street canyon

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@article{0332ec7da63c4d268f6bcce23512881a,
title = "Large eddy simulation of shading effects on NO2 and O3 concentrations within an idealised street canyon",
abstract = "A large eddy simulation (LES) model that accounts for chemical reactions between oxides of nitrogen and ozone has been used to investigate the effect of local shading within an idealised street canyon on pollutant concentrations. It has shown that local shading can have a substantial impact on kerbside concentrations (> 6 ppb difference for some situations presented) and that this may need to be taken into account to set up numerical model runs as well as sampling sites. A sensitivity study has been performed to investigate the effect of various governing parameters. A strong influence was found for the actual reduction of the photolytic rate constant within the shaded areas. A near linear relationship appeared between the reduction and the effect on pollutant concentrations. The chemical regime above and within the street canyon (determined by background concentrations aloft and emission rates at the ground) was also shown to be of high importance. The geometrical layout of the shading within the canyon and the wind speed in the canyon was shown to affect the spatial distribution of the shading effect rather than its overall magnitude. (c) 2007 Elsevier Ltd. All rights reserved.",
keywords = "ozone, photolysis rate, large eddy simulation, shading effect, nitrogen dioxide, street canyon modelling",
author = "David Grawe and Xiaoming Cai and Roy Harrison",
year = "2007",
month = nov,
day = "1",
doi = "10.1016/j.atmosenv.2007.05.015",
language = "English",
volume = "41",
pages = "7304--7314",
journal = "Atmospheric Environment",
issn = "1352-2310",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Large eddy simulation of shading effects on NO2 and O3 concentrations within an idealised street canyon

AU - Grawe, David

AU - Cai, Xiaoming

AU - Harrison, Roy

PY - 2007/11/1

Y1 - 2007/11/1

N2 - A large eddy simulation (LES) model that accounts for chemical reactions between oxides of nitrogen and ozone has been used to investigate the effect of local shading within an idealised street canyon on pollutant concentrations. It has shown that local shading can have a substantial impact on kerbside concentrations (> 6 ppb difference for some situations presented) and that this may need to be taken into account to set up numerical model runs as well as sampling sites. A sensitivity study has been performed to investigate the effect of various governing parameters. A strong influence was found for the actual reduction of the photolytic rate constant within the shaded areas. A near linear relationship appeared between the reduction and the effect on pollutant concentrations. The chemical regime above and within the street canyon (determined by background concentrations aloft and emission rates at the ground) was also shown to be of high importance. The geometrical layout of the shading within the canyon and the wind speed in the canyon was shown to affect the spatial distribution of the shading effect rather than its overall magnitude. (c) 2007 Elsevier Ltd. All rights reserved.

AB - A large eddy simulation (LES) model that accounts for chemical reactions between oxides of nitrogen and ozone has been used to investigate the effect of local shading within an idealised street canyon on pollutant concentrations. It has shown that local shading can have a substantial impact on kerbside concentrations (> 6 ppb difference for some situations presented) and that this may need to be taken into account to set up numerical model runs as well as sampling sites. A sensitivity study has been performed to investigate the effect of various governing parameters. A strong influence was found for the actual reduction of the photolytic rate constant within the shaded areas. A near linear relationship appeared between the reduction and the effect on pollutant concentrations. The chemical regime above and within the street canyon (determined by background concentrations aloft and emission rates at the ground) was also shown to be of high importance. The geometrical layout of the shading within the canyon and the wind speed in the canyon was shown to affect the spatial distribution of the shading effect rather than its overall magnitude. (c) 2007 Elsevier Ltd. All rights reserved.

KW - ozone

KW - photolysis rate

KW - large eddy simulation

KW - shading effect

KW - nitrogen dioxide

KW - street canyon modelling

U2 - 10.1016/j.atmosenv.2007.05.015

DO - 10.1016/j.atmosenv.2007.05.015

M3 - Article

VL - 41

SP - 7304

EP - 7314

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

ER -