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| Titel |
Stratospheric ozone depletion during the 1995–1996 Arctic winter: 3-D simulations on the potential role of different PSC types |
| VerfasserIn |
J. Hendricks, F. Baier, G. Günther, B. C. Krüger, A. Ebel |
| 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 ; 19, no. 9 ; Nr. 19, no. 9, S.1163-1181 |
| Datensatznummer |
250014325
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| Publikation (Nr.) |
 copernicus.org/angeo-19-1163-2001.pdf |
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| Zusammenfassung |
The sensitivity of
modelled ozone depletion in the winter Arctic stratosphere to different
assumptions of prevalent PSC types and PSC formation mechanisms is
investigated. Three-dimensional simulations of the winter 1995/96 are performed
with the COlogne Model of the Middle Atmosphere (COMMA) by applying different
PSC microphysical schemes. Model runs are carried out considering either liquid
or solid PSC particles or a combined microphysical scheme. These simulations
are then compared to a model run which only takes into account binary sulfate
aerosols. The results obtained with the three-dimensional model agree with
trajectory-box simulations performed in previous studies. The simulations
suggest that conditions appropriate for type Ia PSC existence (T < TNAT
) occur over longer periods and cover larger areas when compared to conditions
of potential type Ib PSC existence. Significant differences in chlorine
activation and ozone depletion occur between the simulations including only
either liquid or solid PSC particles. The largest differences, occurring over
large spatial scales and during prolonged time periods, are modelled first,
when the stratospheric temperatures stay below TNAT , but above the
threshold of effective liquid particle growth and second, in the case of the
stratospheric temperatures remaining below this threshold, but not falling
below the ice frost point. It can be generally concluded from the present study
that differences in PSC microphysical schemes can cause significant
fluctuations in ozone depletion modelled for the winter Arctic stratosphere.
Key words. Atmospheric composition
and structure (aerosols and particles; cloud physics and chemistry; middle
atmosphere composition and chemistry) |
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