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| Titel |
The representation of dust transport and missing urban sources as major issues for the simulation of PM episodes in a Mediterranean area |
| VerfasserIn |
E. Flaounas, I. Coll, A. Armengaud, C. Schmechtig |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 20 ; Nr. 9, no. 20 (2009-10-27), S.8091-8101 |
| Datensatznummer |
250007712
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| Publikation (Nr.) |
 copernicus.org/acp-9-8091-2009.pdf |
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| Zusammenfassung |
Due to its adverse effects on human health, atmospheric particulate matter
(PM) constitutes a growing challenge for air quality management. It is also
a complex subject of study. The understanding of its atmospheric evolution
is indeed made difficult by the wide number of sources and the numerous
processes that govern its evolution in the troposphere. As a consequence,
the representation of particulate matter in chemistry-transport models needs
to be permanently evaluated and enhanced in order to refine our
comprehension of PM pollution events and to propose consistent environmental
policies. The study presented here focuses on two successive summer
particulate pollution episodes that occurred on the French Mediterranean coast.
We identify and analyze the constitutive elements of the first and
more massive episode and we discuss their representation within a eulerian
model.
The results show that the model fails in reproducing the variability and the
amplitude of dust import from western Africa, and that it constitutes a
strong bias in PM daily forecasts. We then focus on the lack of diurnal
variability in the model, which is attributed to missing urban sources in
standard emission inventories, and notably the resuspension of particles by
urban road traffic. Through a sensitivity study based on PM and NOx
measurements, we assess the sensitivity of PM to local emissions and the
need to reconsider road traffic PM sources. In parallel, by coupling the
CHIMERE-DUST model outputs to our simulation, we show that the
representation of transcontinental dust transport allows a much better
representation of atmospheric particles in southern France, and that it is
needed in the frame of air quality management for the quantification of the
anthropogenic part of particulate matter pollution. |
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