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| Titel |
Spatio-temporal observations of the tertiary ozone maximum |
| VerfasserIn |
V. F. Sofieva, E. Kyrölä, P. T. Verronen, A. Seppälä, J. Tamminen, D. R. Marsh, A. K. Smith, J.-L. Bertaux, A. Hauchecorne, F. Dalaudier, D. Fussen, F. Vanhellemont, O. Fanton d'Andon, G. Barrot, M. Guirlet, T. Fehr, L. Saavedra |
| 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 ; 9, no. 13 ; Nr. 9, no. 13 (2009-07-09), S.4439-4445 |
| Datensatznummer |
250007494
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| Publikation (Nr.) |
 copernicus.org/acp-9-4439-2009.pdf |
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| Zusammenfassung |
We present spatio-temporal distributions of the tertiary ozone maximum
(TOM), based on GOMOS (Global Ozone Monitoring by Occultation of Stars)
ozone measurements in 2002–2006. The tertiary ozone maximum is typically
observed in the high-latitude winter mesosphere at an altitude of
~72 km. Although the explanation for this phenomenon has been found recently
– low concentrations of odd-hydrogen cause the subsequent decrease in
odd-oxygen losses – models have had significant deviations from existing
observations until recently. Good coverage of polar night regions by GOMOS
data has allowed for the first time to obtain spatial and temporal
observational distributions of night-time ozone mixing ratio in the
mesosphere.
The distributions obtained from GOMOS data have specific features, which are
variable from year to year. In particular, due to a long lifetime of ozone
in polar night conditions, the downward transport of polar air by the
meridional circulation is clearly observed in the tertiary ozone maximum
time series. Although the maximum tertiary ozone mixing ratio is achieved
close to the polar night terminator (as predicted by the theory), TOM can be
observed also at very high latitudes, not only in the beginning and at the
end, but also in the middle of winter. We have compared the observational
spatio-temporal distributions of the tertiary ozone maximum with that
obtained using WACCM (Whole Atmosphere Community Climate Model) and found
that the specific features are reproduced satisfactorily by the model.
Since ozone in the mesosphere is very sensitive to HOx concentrations,
energetic particle precipitation can significantly modify the shape of the
ozone profiles. In particular, GOMOS observations have shown that the
tertiary ozone maximum was temporarily destroyed during the January 2005 and
December 2006 solar proton events as a result of the HOx enhancement
from the increased ionization. |
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