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| Titel |
Use of coupled ozone fields in a 3-D circulation model of the middle atmosphere |
| VerfasserIn |
T. Reddmann, R. Ruhnke, W. Kouker |
| 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 ; 17, no. 3 ; Nr. 17, no. 3, S.415-429 |
| Datensatznummer |
250013696
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| Publikation (Nr.) |
 copernicus.org/angeo-17-415-1999.pdf |
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| Zusammenfassung |
With a detailed chemistry scheme for the
middle atmosphere up to 70 km which has been added to the 3-D Karlsruhe
simulation model of the middle atmosphere (KASIMA), the effects of coupling
chemistry and dynamics through ozone are studied for the middle atmosphere. An
uncoupled version using an ozone climatology for determining heating rates and a
coupled version using on-line ozone are compared in a 10-month integration with
meteorological analyses for the winter 1992/93 as the lower boundary condition.
Both versions simulate the meteorological situation satisfactorily, but exhibit
a too cold lower stratosphere. The on-line ozone differs from the climatological
data between 20 and 40 km by exhibiting too high ozone values, whereas in the
lower mesosphere the ozone values are too low. The coupled model version is
stable and differs only above 40 km significantly from the uncoupled version.
Direct heating effects are identified to cause most of the differences. The
well-known negative correlation between temperature and ozone is reproduced in
the model. As a result, the coupled version slightly approaches the
climatological ozone field. Further feedback effects are studied by using the
on-line ozone field as a basis for an artificial climatology. For non-disturbed
ozone conditions realistic monthly and zonally averaged ozone data are
sufficient to determine the heating rates for modelling the middle atmosphere.
Key words. Atmospheric composition and structure
(middle atmosphere · composition and chemistry) · Meteorology and atmospheric
dynamics (middle atmosphere dynamics). |
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