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| Titel |
Analysis of laminated structure in ozone vertical profiles in central Europe |
| VerfasserIn |
P. Mlch, J. Lasutovicuka |
| 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 ; 14, no. 7 ; Nr. 14, no. 7, S.744-752 |
| Datensatznummer |
250012356
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| Publikation (Nr.) |
 copernicus.org/angeo-14-744-1996.pdf |
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| Zusammenfassung |
| Using statistical techniques, we study the
relationship between the long-term changes in the laminar structure of the ozone
vertical profile at two central-European stations - Hohenpeissenberg and
Lindenberg - and other quantities potentially affecting the state of the lower
stratosphere, and total-ozone content. We consider only positive laminae greater
than 30 nbar. Laminae contribute non-negligibly to total ozone, and this
contribution varies strongly with season. The maximum laminae-occurrence
frequency in late winter/early spring is five-times higher than the minimum in
early autumn. The main result of the paper is the discovery of a strong negative
trend in the frequency of laminae occurrence, about –15% per decade, and even a
slightly stronger negative trend in ozone content in laminae. Strong negative
trends in laminae occurrence imply negative changes in total ozone as well. No
pronounced effect of the quasi-biennial oscillation and solar cycle on laminae
was found, whereas the 100-hPa temperature had a clear effect, and there was an
indication of substantial effects of volcanic eruptions and El Niño southern
oscillation events. Long-term changes in individual time series of
meteorological parameters measured over Hohenpeissenberg do not indicate their
significant role in the observed trend in laminae occurrence. On the other hand,
there is some increase in the occurrence of very zonal circulation patterns, as
well as slight decrease in very meridional circulation patterns. Together with
other indications this allows us to say that dynamical effects are expected to
be a principal contributor. Thus changes in laminae occurrence will probably be
able to serve as an indicator/tracer of long-term changes in lower-stratospheric
dynamics. |
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