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| Titel |
Stratospheric warming influence on the mesosphere/lower thermosphere as seen by the extended CMAM |
| VerfasserIn |
M. G. Shepherd, S. R. Beagley, V. I. Fomichev |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 6 ; Nr. 32, no. 6 (2014-06-03), S.589-608 |
| Datensatznummer |
250121066
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| Publikation (Nr.) |
 copernicus.org/angeo-32-589-2014.pdf |
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| Zusammenfassung |
| The response of the upper mesosphere/lower thermosphere region to major
sudden stratospheric warming (SSW) is examined employing temperature, winds,
NOX and CO constituents from the extended Canadian Middle
Atmosphere Model (CMAM) with continuous incremental nudging below 10 hPa
(~ 30 km). The model results considered cover high latitudes
(60–85° N) from 10 to 150 km height for the December–March period
of 2003/2004, 2005/2006 and 2008/2009, when some of the strongest SSWs in
recent years were observed. NOX and CO are used as proxies for
examining transport. Comparisons with ACE-FTS (Atmospheric Chemistry Experiment–Fourier Transform Spectrometer) satellite observations show
that the model represents well the dynamics of the upper mesosphere/lower
thermosphere region, the coupling of the stratosphere–mesosphere, and the
NOX and CO transport. New information is obtained on the upper
mesosphere/lower thermosphere up to 150 km showing that the NOX
volume mixing ratio in the 2003/2004 winter was very perturbed indicating
transport from the lower atmosphere and intense mixing with large
NOX influx from the thermosphere compared to 2006 and 2009. These
results, together with those from other models and observations, clearly show
the impact of stratospheric warmings on the thermosphere. |
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