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Development and Application of a Reactive Plume-in-grid Model: Evaluation Over Greater Paris : Volume 10, Issue 2 (22/02/2010)

By Korsakissok, I.

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Book Id: WPLBN0003987864
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: Development and Application of a Reactive Plume-in-grid Model: Evaluation Over Greater Paris : Volume 10, Issue 2 (22/02/2010)  
Author: Korsakissok, I.
Volume: Vol. 10, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Korsakissok, I., & Mallet, V. (2010). Development and Application of a Reactive Plume-in-grid Model: Evaluation Over Greater Paris : Volume 10, Issue 2 (22/02/2010). Retrieved from http://members.worldlibrary.net/


Description
Description: CEREA, Joint Research Laboratory, ENPC/EDF R&D, Université Paris Est, 6–8 avenue Blaise Pascal, Cité Descartes, 77455 Champs-sur-Marne, Marne la Vallée Cedex 2, France. Emissions from major point sources are badly represented by classical Eulerian models. An overestimation of the horizontal plume dilution, a bad representation of the vertical diffusion as well as an incorrect estimate of the chemical reaction rates are the main limitations of such models in the vicinity of major point sources. The plume-in-grid method is a multiscale modeling technique that couples a local-scale Gaussian puff model with an Eulerian model in order to better represent these emissions. We present the plume-in-grid model developed in the air quality modeling system Polyphemus, with full gaseous chemistry. The model is evaluated on the metropolitan Île-de-France region, during six months (summer 2001). The subgrid-scale treatment is used for 89 major point sources, a selection based on the emission rates of NOx and SO2. Results with and without the subgrid treatment of point emissions are compared, and their performance by comparison to the observations at measurement stations is assessed. A sensitivity study is also carried out, on several local-scale parameters as well as on the vertical diffusion within the urban area.

Primary pollutants are shown to be the most impacted by the plume-in-grid treatment, with a decrease in RMSE by up to about -17% for SO2 and -7% for NO at measurement stations. SO2 is the most impacted pollutant, since the point sources account for an important part of the total SO2 emissions, whereas NOx emissions are mostly due to traffic. The spatial impact of the subgrid treatment is localized in the vicinity of the sources, especially for reactive species (NOx and O3). Reactive species are mostly sensitive to the local-scale parameters, such as the time step between two puff emissions which influences the in-plume chemical reactions, whereas the almost-passive species SO2 is more sensitive to the injection time, which determines the duration of the subgrid-scale treatment.

Future developments include an extension to handle aerosol chemistry, and an application to the modeling of line sources in order to use the subgrid treatment with road emissions. The latter is expected to lead to more striking results, due to the importance of traffic emissions for the pollutants of interest.


Summary
Development and application of a reactive plume-in-grid model: evaluation over Greater Paris

Excerpt
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