 |
| Titel |
Development and application of a reactive plume-in-grid model: evaluation over Greater Paris |
| VerfasserIn |
I. Korsakissok, V. Mallet |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 18 ; Nr. 10, no. 18 (2010-09-22), S.8917-8931 |
| Datensatznummer |
250008787
|
| Publikation (Nr.) |
 copernicus.org/acp-10-8917-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
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 on 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. 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). Ozone is mostly sensitive to 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|