MUNICH v2.0: a street-network model coupled with SSH-aerosol (v1.2) for multi-pollutant modelling

Youngseob Kim (1) , Lya Lugon (1) , Alice Maison (1, 2) , Thibaud Sarica (1) , Yelva Roustan (1) , Myrto Valari (3) , Yang Zhang (4) , Michel André (5) , Karine Sartelet (1)

1 CEREA - Centre d'Enseignement et de Recherche en Environnement Atmosphérique
2 ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes
3 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
4 Northeastern University [Boston]
5 Université Gustave Eiffel

A new version of a street-network model, the Model of Urban Network of Intersecting Canyons and Highways version 2.0 (MUNICH v2.0), is presented. The comprehensive aerosol model SSH-aerosol is implemented in MUNICH v2.0 to simulate the street concentrations of multiple pollutants, including secondary aerosols. The implementation uses the application programming interface (API) technology so that the SSH-aerosol version may be easily updated. New parameterisations are also introduced in MUNICH v2.0, including a non-stationary approach to model reactive pollutants, particle deposition and resuspension, and a parameterisation of the wind at roof level. A test case over a Paris suburb is presented for model evaluation and to illustrate the impact of the new functionalities. The implementation of SSH-aerosol leads to an increase of 11 % in PM₁₀ concentration because of secondary aerosol formation. Using the non-stationary approach rather than the stationary one leads to a decrease in NO₂ concentration of 16 %. The impact of particle deposition on built surfaces and road resuspension on pollutant concentrations in the street canyons is low.

Domaines: Planète et Univers [physics]; Sciences de l'environnement

Youngseob Kim, Lya Lugon, Alice Maison, Thibaud Sarica, Yelva Roustan, et al.. MUNICH v2.0: a street-network model coupled with SSH-aerosol (v1.2) for multi-pollutant modelling. Geoscientific Model Development, 2022, 15, pp.7371-7396. ⟨10.5194/gmd-15-7371-2022⟩. ⟨insu-03847083⟩