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| Titel |
Modelling HNO3 and N2O enhancements due to Solar Proton Events |
| VerfasserIn |
A. J. G. Baumgaertner, P. Jöckel, H. Riede, B. Funke, G. Stiller |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020049
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| Zusammenfassung |
| Solar Proton Events perturb middle atmospheric chemistry and are interesting natural
experiments that allow us to test and improve our understanding of atmospheric chemistry,
our observational capabilities, and numerical models. Models now reproduce NOx, HOx and
related ozone chemistry relatively well. However, instruments such as MIPAS on
the ENVISAT satellite now measure SPE-induced changes for a large variety of
other species, and for several of them, e.g. HNO3 and N2O, discrepancies between
measurements and some models have been found. Here, we present model results for
stratospheric HNO3 and mesospheric N2O using the atmospheric chemistry general
circulation model EMAC (ECHAM5/MESSy) and the atmospheric chemistry box model
CAABA (Chemistry of the Atmosphere As a Box model Application). For HNO3, a
simple parameterization is introduced which is coupled to the standard SPE-induced
HOx/NOx production parameterization. For N2O, a modification of the standard NOx
production scheme, where 0.85 NOx molecules instead of 1.25 are produced per ion
pair, is suggested and shown to yield results that match MIPAS measurements. |
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