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| Titel |
Photochemistry of the Martian atmosphere: Pathway analysis of ozone formation and destruction |
| VerfasserIn |
J. W. Stock, C. S. Boxe, R. Lehmann, J. L. Grenfell, A. B. C. Patzer, H. Rauer, Y. L. Yung |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062174
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| Zusammenfassung |
| Ozone is of central importance for the Martian atmosphere, because e.g. it is related to the
photochemical stability of the main atmospheric constituent, CO2. Furthermore, ozone is
relatively easy to observe, since it exhibits strong spectral features. The concentration of
ozone is influenced by chemical trace species (mainly from the Ox- and HOx-family) acting
as catalysts in chemical pathways. It is therefore desirable to identify those pathways and
quantify their efficiency by calculating pathway rates. Finding chemical pathways in complex
reaction networks is in general challenging. Therefore, automated computer algorithms are
useful to address such problems. In order to investigate the Martian atmospheric ozone
photochemistry, we apply the PAP (Pathway Analysis Program) algorithm to the
results of the updated JPL/Caltech photochemical column model of the Martian
atmosphere. Rates of individual ozone production and destruction pathways are
computed for different altitudes, by applying the algorithm to each vertical layer of the
column model separately. Our findings show, that ozone is primarily produced
by a Chapman-like mechanism involving CO2 photolysis products as source for
atomic oxygen. Ozone destruction proceeds mainly via photolysis except for a layer
around 42km where the reaction with atomic hydrogen become more important. |
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