Interaction d’échelles dans les modèles de chimie-transport pour mieux connaître l’impact des grandes villes sur leur environnement

Abstract : In Chemistry Transport Models (CTMs), spatial scale interactions are often represented through off-line coupling between large and small scale models. However, such nested configurations cannot give account of the impact of the local scale on its surroundings. This issue can be critical in areas exposed to regions with sharp pollutant emission gradients such as megacities. We introduced a new development making use of a horizontal stretched grid, in the Eulerian CTM CHIMERE. This method, referred to as “zooming”, consists in the introduction of local zooms in a single chemistry-transport simulation. It allows online bridging of spatial scales from the city to the continental scale. Testing the approach over a continental European domain, zoomed over Benelux, we demonstrate that, compared with one-way nesting, the zooming method allows the representation of a significant feedback of the refined domain towards the large scale showing that this approach constitutes a useful tool to understand the interactions of megacities with their continental environment.
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Guillaume Siour, Augustin Colette. Interaction d’échelles dans les modèles de chimie-transport pour mieux connaître l’impact des grandes villes sur leur environnement. Rapport Scientifique INERIS, 2014, 2013-2014, pp.56-57. ⟨ineris-01869510⟩

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