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| Titel |
Forecast, observation and modelling of a deep stratospheric intrusion event over Europe |
| VerfasserIn |
P. Zanis, T. Trickl, A. Stohl, H. Wernli, O. Cooper, C. Zerefos, H. Gaeggeler, C. Schnabel, L. Tobler, P. W. Kubik, A. Priller, H. E. Scheel, H. J. Kanter, P. Cristofanelli, C. Forster, P. James, E. Gerasopoulos, A. Delcloo, A. Papayannis, H. Claude |
| 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 ; 3, no. 3 ; Nr. 3, no. 3 (2003-06-18), S.763-777 |
| Datensatznummer |
250001046
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| Publikation (Nr.) |
 copernicus.org/acp-3-763-2003.pdf |
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| Zusammenfassung |
| A wide range of measurements was carried out in central and southeastern Europe
within the framework of the EU project STACCATO (Influence of Stratosphere-Troposphere
Exchange in a Changing Climate on Atmospheric Transport and Oxidation Capacity) with the principle goal to create a comprehensive data set on
stratospheric air intrusions into the troposphere along a rather frequently observed
pathway over central Europe from the North Sea to the Mediterranean Sea. The
measurements were based on predictions by suitable quasi-operational trajectory
calculations using ECMWF forecast data. A predicted deep Stratosphere to Troposphere Transport
(STT) event, encountered during the STACCATO period on 20-21 June 2001, was followed by the measurements network almost from its
inception. Observations provide evidence that the intrusion affected large parts of
central and southeastern Europe. Especially, the ozone lidar observations on
20-21 June 2001 at Garmisch-Partenkirchen, Germany captured the evolution of two marked
tongues of high ozone with the first one descending to nearly 2 km, thus providing an
excellent data set for model intercomparisons and validation. In addition, for the first
time to our knowledge concurrent surface measurements of the cosmogenic radionuclides
10Be and 7Be and their ratio 10Be/7Be are presented together as stratospheric tracers in a case
study of a stratospheric intrusion. The ozone tracer columns calculated with the
FLEXPART model were found to be in good agreement with water vapour satellite
images, capturing the evolution of the observed dry streamers of stratospheric origin.
Furthermore, the time-height cross section of ozone tracer simulated with FLEXPART over Garmisch-Partenkirchen captures many details of the evolution of
the two observed high-ozone filaments measured with the IFU lidar, thus demonstrating the considerable progress in model simulations. Finally, the modelled
ozone (operationally available since October 1999) from the ECMWF (European
Centre for Medium-Range Weather Forecasts) atmospheric model is shown to be in
very good agreement with the observations during this case study, which provides the
first successful validation of a chemical tracer that is derived operationally from a
weather forecast model. This suggests that coupling chemistry and weather forecast
models may significantly improve both weather and chemical forecasts in the future. |
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