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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 3
Ann. Geophys., 17, 415–429, 1999
https://doi.org/10.1007/s00585-999-0415-8
© European Geosciences Union 1999
Ann. Geophys., 17, 415–429, 1999
https://doi.org/10.1007/s00585-999-0415-8
© European Geosciences Union 1999

  31 Mar 1999

31 Mar 1999

Use of coupled ozone fields in a 3-D circulation model of the middle atmosphere

T. Reddmann, R. Ruhnke, and W. Kouker T. Reddmann et al.
  • Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany
  • Correspondence to: T. Reddmann e-mail: thomas.reddmann@imk.fzk.de

Abstract. 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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