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| Titel |
Stratosphere-troposphere ozone exchange from high resolution MLS ozone analyses |
| VerfasserIn |
J. Barré, V.-H. Peuch, J.-L. Attié, L. Amraoui, W. A. Lahoz, B. Josse, M. Claeyman, P. Nédélec |
| 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. 14 ; Nr. 12, no. 14 (2012-07-16), S.6129-6144 |
| Datensatznummer |
250011317
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| Publikation (Nr.) |
 copernicus.org/acp-12-6129-2012.pdf |
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| Zusammenfassung |
| We assimilate stratospheric ozone profiles from MLS (Microwave Limb Sounder)
into the MOCAGE Chemistry Transport Model (CTM) to study
Stratosphere-Troposphere Exchange (STE). This study uses two horizontal grid
resolutions of 2° and 0.2°. The combined impacts of MLS ozone
assimilation and high horizontal resolution are illustrated in two case
studies where STE events occurred (23 June 2009 and 17 July 2009). At high
resolution the filamentary structures of stratospheric air which characterise
STE events are captured by the model. To test the impact of the assimilation
and the resolution, we compare model outputs from different experiments (high
resolution and low resolution; MLS assimilation run and free run) with
independent data (MOZAIC aircraft ozone data; WOUDC ozone sonde network
data). MLS ozone analyses show a better description of the Upper Troposphere
Lower Stratosphere (UTLS) region and the stratospheric intrusions than the
free model run. In particular, at high horizontal resolution the MLS ozone
analyses present realistic filamentary ozone structures in the UTLS and
laminae structures in the ozone profile. Despite a low aspect ratio between
horizontal resolution and vertical resolution in the UTLS at high horizontal
resolution, MLS ozone analyses improve the vertical structures of the ozone
fields. Results from backward trajectories and ozone forecasts show that
assimilation at high horizontal resolution of MLS ozone profiles between
10 hPa and 215 hPa has an impact on tropospheric ozone. |
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