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| Titel |
Estimation of heterogeneous reaction rates for stratospheric trace gases with particular reference to the diffusional uptake of HCl and ClONO2 by polar stratospheric clouds |
| VerfasserIn |
S. Ghosh, D. Lary, J. A. Pyle |
| 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 ; 13, no. 4 ; Nr. 13, no. 4, S.406-412 |
| Datensatznummer |
250011820
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| Publikation (Nr.) |
 copernicus.org/angeo-13-406-1995.pdf |
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| Zusammenfassung |
| The stratosphere holds a variety of
particulates like polar stratospheric clouds (PSCs) and sulphate aerosols which
catalyse chemical reactions. These reactions cause changes in the composition of
the stratosphere, including the redistribution of active chlorine which might
lead to ozone destruction. As a result during recent years a lot of effort has
been directed towards the quantification of the uptake of trace gases like ClONO2,
HCl, etc. into these particulates. However, it has been observed that many of
the two and three dimensional models used in such studies are constrained by the
lack of adequate rate constant data. This paper describes a theoretical approach
to estimate the reaction rate constants for 23 gases on both types of polar
stratospheric clouds (type I and II). It is found that for gases like N2O5,
ClONO2 and HCl, diffusional uptake is important and contributes
significantly to the heterogeneous reaction rate. A complete Lennard-Jones
calculation is used to accurately compute the trace gas diffusion coefficients. |
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