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| Titel |
Ozone and water vapour in the austral polar stratospheric vortex and sub-vortex |
| VerfasserIn |
E. Peet, V. Rudakov, V. Yushkov, G. Redaelli, A. R. MacKenzie |
| 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 ; 22, no. 12 ; Nr. 22, no. 12 (2004-12-22), S.4035-4041 |
| Datensatznummer |
250015070
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| Publikation (Nr.) |
 copernicus.org/angeo-22-4035-2004.pdf |
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| Zusammenfassung |
In-situ measurements of ozone and water vapour, in the Antarctic lower
stratosphere, were made as part of the APE-GAIA mission in September and
October 1999. The measurements show a distinct difference above and below
the 415K isentrope. Above 415K, the chemically perturbed region of low
ozone and water vapour is clearly evident. Below 415K, but still above the
tropopause, no sharp meridional gradients in ozone and water vapour were
observed. The observations are consistent with analyses of potential
vorticity from the European Centre for Medium Range Weather Forecasting,
which show smaller radial gradients at 380K than at 450K potential
temperature. Ozone loss in the chemically perturbed region above
415K averages 5ppbv per day for mid-September to mid-October. Apparent
ozone loss rates in the sub-vortex region are greater, at 7ppbv per day.
The data support, therefore, the existence of a sub-vortex region in which
meridional transport is more efficient than in the vortex above. The low
ozone mixing ratios in the sub-vortex region may be due to in-situ chemical
destruction of ozone or transport of ozone-poor air out of the bottom of the
vortex. The aircraft data we use cannot distinguish between these two
processes.
Key words. Meteorology and atmospheric dynamics polar
meteorology) – Atmospheric composition and structure
(middle atmosphere–composition and chemistry) |
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