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| Titel |
Detailed PSC formation in a two-dimensional chemical transport model of the stratosphere |
| VerfasserIn |
D. Fonteyn, N. Larsen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 3 ; Nr. 14, no. 3, S.315-328 |
| Datensatznummer |
250012212
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| Publikation (Nr.) |
 copernicus.org/angeo-14-315-1996.pdf |
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| Zusammenfassung |
| A new two-dimensional zonal model of the
stratosphere, based on a formulation in an isentropic framework, with complete
chemistry has been coupled with a high resolution detailed microphysical model
for polar stratospheric clouds (PSCs). The 2D model chemistry includes all
presently known heterogeneous processes on sulfate aerosols and PSCs. The
coupling of these two models, with inherently different time scales, is
discussed. It is demonstrated that in order to obtain a realistic
interrelationship between NOy and N2O an accurate
simulation of the sedimentation by PSC particles is necessary. A good agreement
of model PSC presence and observations is found for the Antarctic polar winter
without the need to impose additional artificial temperature variations in the
model. The calculated occurrence of polar stratospheric clouds and resulting
heterogeneous chemistry during the Antarctic winter are discussed. Sensitivity
of the polar stratospheric chemical composition and cloud formation for
different perturbations is investigated by studying the effects of transport
across the polar vortex boundary and heterogeneous processing by an enhanced
sulfate aerosol load. The importance of including sedimentation for all cases is
also discussed. |
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