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| Titel |
Vertical redistribution of NOy in the polar stratosphere in winter 2009/2010 |
| VerfasserIn |
Jens-Uwe Grooß, Rolf Müller, Hans Schlager, C. Michael Volk, Peter Bernath, Chris Boone, Kaley A. Walker |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053208
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| Zusammenfassung |
| Polar stratospheric temperatures in winter 2009/2010 were low enough that even ice particles
were found to be present. Large particles with a major content of reactive nitrogen (NOy)
have been observed in about 20 km altitude, most likely composed of solid nitric acid
trihydrate (NAT). The sedimentation of these particles yields a vertical redistribution of NOy
with consequences for chemical ozone depletion.
Simulations with the Chemical Lagrangian Model of the Stratophere (CLaMS) show this
effect. The results of the simulations are confirmed by in-situ observations of NOy (SIOUX)
and N2O (HAGAR) taken onboard the Geophysica aircraft for the flight altitudes up to 20
km. Above 20 km, the NOy redistribution is compared with NOy derived from satellite
observations by the ACE-FTS experiment.
The comparison of the simulation and observations will be shown, especially regarding
the sensitivity to significant parameters as the NAT nucleation rate. The impact of
denitrification on ozone loss will be determined. |
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