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| Titel |
Influence of transport and mixing in autumn on stratospheric ozone variability over the Arctic in early winter |
| VerfasserIn |
D. Blessmann, I. Wohltmann, M. Rex |
| 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. 17 ; Nr. 12, no. 17 (2012-09-06), S.7921-7930 |
| Datensatznummer |
250011425
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| Publikation (Nr.) |
 copernicus.org/acp-12-7921-2012.pdf |
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| Zusammenfassung |
| Early winter ozone mixing ratios in the Arctic middle stratosphere show an
interannual variability of about 10%. We show that ozone variability in
early January is caused by dynamical processes during Arctic polar vortex
formation in autumn (September to December). Observational data from
satellites and ozone sondes are used in conjunction with simulations of the
chemistry and transport model ATLAS to examine the relationship between the
meridional and vertical origin of air enclosed in the polar vortex and its
ozone amount. For this, we use a set of artificial model tracers to deduce
the origin of the air masses in the vortex in January in latitude and
altitude in September. High vortex mean ozone mixing ratios are correlated
with a high fraction of air from low latitudes enclosed in the vortex and a
high fraction of air that experienced small net subsidence (in a Lagrangian
sense). As a measure for the strength of the Brewer-Dobson circulation and
meridional mixing in autumn, we use the Eliassen-Palm flux through the
mid-latitude tropopause averaged from September to November. In the lower
stratosphere, this quantity correlates well with the origin of air enclosed
in the vortex and reasonably well with the ozone amount in early winter. |
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