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| Titel |
3-D evaluation of tropospheric ozone simulations by an ensemble of regional Chemistry Transport Model |
| VerfasserIn |
D. Zyryanov, G. Foret, M. Eremenko, M. Beekmann, J.-P. Cammas, M. D'Isidoro, H. Elbern, J. Flemming, E. Friese, I. Kioutsioutkis, A. Maurizi, D. Melas, F. Meleux, L. Menut, P. Moinat, V.-H. Peuch, A. Poupkou, M. Razinger, M. Schultz, O. Stein, A. M. Suttie, A. Valdebenito, C. Zerefos, G. Dufour, G. Bergametti, J.-M. Flaud |
| 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 ; 12, no. 7 ; Nr. 12, no. 7 (2012-04-03), S.3219-3240 |
| Datensatznummer |
250011008
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| Publikation (Nr.) |
 copernicus.org/acp-12-3219-2012.pdf |
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| Zusammenfassung |
| A detailed 3-D evaluation of an ensemble of five regional Chemistry Transport
Models (RCTM) and one global CTM with focus on free tropospheric ozone over
Europe is presented. It is performed over a summer period (June to August
2008) in the context of the GEMS-RAQ project. A data set of about 400
vertical ozone profiles from balloon soundings and commercial aircraft at 11
different locations is used for model evaluation, in addition to satellite
measurements with the infrared nadir sounder (IASI) showing largest
sensitivity to free tropospheric ozone. In the middle troposphere, the four
regional models using the same top and boundary conditions from IFS-MOZART
exhibit a systematic negative bias with respect to observed profiles of about
−20%. Root Mean Square Error (RMSE) values are constantly growing with
altitude, from 22% to 32% to 53%, respectively for 0–2 km,
2–8 km and 8–10 km height ranges. Lowest correlation is found in the
middle troposphere, with minimum coefficients (R) between 0.2 to 0.45 near
8 km, as compared to 0.7 near the surface and similar values around 10 km.
A sensitivity test made with the CHIMERE mode also shows that using hourly
instead of monthly chemical boundary conditions generally improves the model
skill (i.e. improve RMSE and correlation). Lower tropospheric 0–6 km
partial ozone columns derived from IASI show a clear North-South gradient
over Europe, which is qualitatively reproduced by the models. Also the
temporal variability showing decreasing ozone concentrations in the lower
troposphere (0–6 km columns) during summer is well reproduced by models
even if systematic bias remains (the value of the bias being also controlled
by the type of used boundary conditions). A multi-day case study of a trough
with low tropopause was conducted and showed that both IASI and models were
able to resolve strong horizontal gradients of middle and upper tropospheric
ozone occurring in the vicinity of an upper tropospheric frontal zone. |
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