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| Titel |
The thermospheric NOx intrusion in Arctic winter 2008/2009 |
| VerfasserIn |
T. Reddmann, B. Funke, G. Stiller, S. Versick, J. M. Wissing, R. Ruhnke, W. Kouker, A. Vlasov |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250068364
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| Zusammenfassung |
| We present model simulations with the 3D model KASIMA for the Arctic winter 2008/2009. Despite low solar and geomagnetic activity, in this winter one of the strongest NOx intrusions from the lower thermosphere to the mesosphere and upper stratosphere has been observed after the stratospheric warming in early 2009. It seems still to be unclear how much different processes as stratospheric warming, gravity wave interaction, diffusive transport and local ionization contribute to the NOx enhancement. The analysis of this event is subject of an international model intercomparison project (HEPPA II). In the context of this intercomparison, we compare different realisations of the NOx intrusion in the KASIMA model in order to test if vertical transport and NOx production is realistically represented in the model: (1) a model run where observed values of NOx from MIPAS on ENVISAT are used to set NOx in the upper mesosphere, and (2) a run where ionization rates derived from the AIMOS model are used. Both realizations are compared with a reference run without mesospheric NOx intrusion to assess its chemical impact. |
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