Atmospheric dispersion modeling near a roadway under calm meteorological conditions

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Atmospheric dispersion modeling near a roadway under calm meteorological conditions

Fallah Shorshani, Masoud / Seigneur, Christian / Polo Rehn, Lucie / Chanut, Hervé / Pellan, Yann / Jaffrezo, Jean-luc / Charron, Aurélie / André, Michel

Abstract

Highlights • We investigate the dispersion of pollutant under calm meteorological situations. • We estimate vehicle emissions with local traffic data. • PM resuspension is included based on Positive Matrix Factorization analysis. • The atmospheric dispersion model is modified and is evaluated using measurements. • Model performance is satisfactory for PM and PM components.

Abstract Atmospheric pollutant dispersion near sources is typically simulated by Gaussian models because of their efficient compromise between reasonable accuracy and manageable computational time. However, the standard Gaussian dispersion formula applies downwind of a source under advective conditions with a well-defined wind direction and cannot calculate air pollutant concentrations under calm conditions with fluctuating wind direction and/or upwind of the emission source. Attempts have been made to address atmospheric dispersion under such conditions. This work evaluates the performance of standard and modified Gaussian plume models using measurements of NO2, PM10, PM2.5, five inorganic ions and seven metals conducted near a freeway in Grenoble, France, during 11–27 September 2011. The formulation for calm conditions significantly improves model performance. However, it appears that atmospheric dispersion due to vehicle-induced turbulence is still underestimated. Furthermore, model performance is poor for particulate species unless road dust resuspension by traffic is explicitly taken into account.

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Dokumentinformationen

Titel :

Atmospheric dispersion modeling near a roadway under calm meteorological conditions

Beteiligte:

Fallah Shorshani, Masoud (Autor:in) / Seigneur, Christian (Autor:in) / Polo Rehn, Lucie (Autor:in) / Chanut, Hervé (Autor:in) / Pellan, Yann (Autor:in) / Jaffrezo, Jean-luc (Autor:in) / Charron, Aurélie (Autor:in) / André, Michel (Autor:in)

Erschienen in:

Transportation Research Part D: Transport and Environment ; 34 ; 137-154

Erscheinungsdatum :

2014-01-01

Format / Umfang :

18 pages

ISSN :

1361-9209

DOI :

https://doi.org/10.1016/j.trd.2014.10.013

Medientyp :

Aufsatz (Zeitschrift)