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| Titel |
Simulation of denitrification and ozone loss for the Arctic winter 2002/2003 |
| VerfasserIn |
J.-U. Grooß, G. Günther, R. Müller, P. Konopka, S. Bausch, H. Schlager, C. Voigt, C. M. Volk, G. C. Toon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 5, no. 6 ; Nr. 5, no. 6 (2005-06-15), S.1437-1448 |
| Datensatznummer |
250002895
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| Publikation (Nr.) |
 copernicus.org/acp-5-1437-2005.pdf |
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| Zusammenfassung |
| We present simulations with the Chemical Lagrangian Model of the
Stratosphere (CLaMS) for the Arctic winter 2002/2003. We integrated a
Lagrangian denitrification scheme into the three-dimensional
version of CLaMS that calculates the growth and sedimentation of
nitric acid trihydrate (NAT) particles along individual particle
trajectories. From those, we derive the HNO3 downward flux
resulting from different particle nucleation assumptions.
The simulation results show a clear vertical redistribution of total
inorganic nitrogen ( ), with a maximum vortex average permanent
removal of over 5ppb in late December between 500 and 550K
and a corresponding increase of of over 2ppb below about
450K.
The simulated vertical redistribution of is compared with
balloon observations by MkIV and in-situ observations from the high
altitude aircraft Geophysica. Assuming a globally uniform NAT
particle nucleation rate of 7.8x10-6cm-3h-1 in
the model, the observed denitrification is well reproduced.
In the investigated winter 2002/2003, the denitrification has only
moderate impact (≤14%) on the simulated vortex average ozone loss of
about 1.1ppm near the 460K level.
At higher altitudes, above 600K potential temperature, the simulations
show significant ozone depletion through -catalytic cycles due to the
unusual early exposure of vortex air to sunlight. |
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