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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-189
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
01 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Multi-scale modeling of urban air pollution: development and application of a Street-in-Grid model by coupling MUNICH and Polair3D
Youngseob Kim1, You Wu2, Christian Seigneur1, and Yelva Roustan1 1CEREA, Joint Laboratory École des Ponts ParisTech/EDF R&D, Université Paris-Est, 77455 Champs-sur-Marne, France
2EDF R&D China, 100005 Beijing, China
Abstract. A new multi-scale model of urban air pollution is presented. This model combines a chemical-transport model (CTM) that includes a comprehensive treatment of atmospheric chemistry and transport at spatial scales down to 1 km and a street-network model that describes the atmospheric concentrations of pollutants in an urban street network. The streetnetwork model is the Model of Urban Network of Intersecting Canyons and Highways (MUNICH), which consists of two 5 main components: a street-canyon component and a street-intersection component. MUNICH is coupled to the Polair3D CTM of the Polyphemus air quality modeling platform to constitute a Street-in-Grid (SinG) model. MUNICH is used to simulate the concentrations of the chemical species in the urban canopy, which is located in the lowest layer of Polair3D, and the simulation of pollutant concentrations above roof-tops is performed by Polair3D. Interactions between MUNICH and Polair3D occur at roof level and depend on a vertical mass transfer coefficient that is a function of atmospheric turbulence. SinG is 10 used to simulate the concentrations of nitrogen oxides (NOx) and ozone (O3) in a Paris suburb. Simulated concentrations are compared to NOx concentrations measured at two monitoring stations within a street canyon. SinG shows better performance than MUNICH for nitrogen dioxide (NO2) concentrations. However, both SinG and MUNICH underestimate NOx. Model performance for NOx concentrations is not sensitive to using a complex chemistry model in MUNICH and the Leighton NO/NO2/O3 set of reactions is sufficient.

Citation: Kim, Y., Wu, Y., Seigneur, C., and Roustan, Y.: Multi-scale modeling of urban air pollution: development and application of a Street-in-Grid model by coupling MUNICH and Polair3D, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-189, in review, 2017.
Youngseob Kim et al.
Youngseob Kim et al.
Youngseob Kim et al.

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Short summary
A new multi-scale model of urban air pollution is presented. This model combines a regional chemical-transport model (CTM) with spatial scales down to 1 km and a street-network model. The street-network model MUNICH is coupled to the Polair3D CTM to constitute a Street-in-Grid (SinG) model. SinG and MUNICH are used to simulate the concentrations of NOx and ozone in a Paris suburb. SinG shows better performance than MUNICH for NO2 measured at monitoring stations within a street canyon.
A new multi-scale model of urban air pollution is presented. This model combines a regional...
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