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| Titel |
Global model simulations of air pollution during the 2003 European heat wave |
| VerfasserIn |
C. Ordóñez, N. Elguindi, O. Stein, V. Huijnen, J. Flemming, A. Inness, H. Flentje, E. Katragkou, P. Moinat, V.-H. Peuch, A. Segers, V. Thouret, G. Athier, M. Weele, C. S. Zerefos, J.-P. Cammas, M. G. Schultz |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2010-01-26), S.789-815 |
| Datensatznummer |
250007976
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| Publikation (Nr.) |
 copernicus.org/acp-10-789-2010.pdf |
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| Zusammenfassung |
| Three global Chemistry Transport Models – MOZART, MOCAGE, and
TM5 – as well as MOZART coupled to the IFS meteorological model including
assimilation of ozone (O3) and carbon monoxide (CO)
satellite column retrievals, have been compared to surface measurements and
MOZAIC vertical profiles in the troposphere over Western/Central Europe for
summer 2003. The models reproduce the meteorological features and
enhancement of pollution during the period 2–14 August, but not fully the
ozone and CO mixing ratios measured during that episode. Modified normalised
mean biases are around −25% (except ~5% for MOCAGE) in the case
of ozone and from −80% to −30% for CO in the boundary layer above
Frankfurt. The coupling and assimilation of CO columns from MOPITT overcomes
some of the deficiencies in the treatment of transport, chemistry and
emissions in MOZART, reducing the negative biases to around 20%. The
high reactivity and small dry deposition velocities in MOCAGE seem to be
responsible for the overestimation of O3 in this model.
Results from sensitivity simulations indicate that an increase of the
horizontal resolution to around 1°×1° and potential
uncertainties in European anthropogenic emissions or in long-range transport
of pollution cannot completely account for the underestimation of CO and
O3 found for most models. A process-oriented TM5
sensitivity simulation where soil wetness was reduced results in a decrease
in dry deposition fluxes and a subsequent ozone increase larger than the
ozone changes due to the previous sensitivity runs. However this latest
simulation still underestimates ozone during the heat wave and overestimates
it outside that period. Most probably, a combination of the mentioned
factors together with underrepresented biogenic emissions in the models,
uncertainties in the modelling of vertical/horizontal transport processes in
the proximity of the boundary layer as well as limitations of the chemistry
schemes are responsible for the underestimation of ozone (overestimation in
the case of MOCAGE) and CO found in the models during this extreme pollution
event. |
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