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| Titel |
ClOOCl photolysis at high solar zenith angles: Analysis of RECONCILE self-match flight |
| VerfasserIn |
Olga Sumińska, Fred Stroh, Ralph Lehmann, Tobias Wegner, Jens-Uwe Grooß, Marc von Hobe |
| 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 |
250048267
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| Zusammenfassung |
| The ClO-dimer catalytic cycle is one of the key processes driving ozone loss in the polar
winter/spring stratosphere. Some kinetic parameters controlling this cycle are still not
unambiguously determined. In particular, there exists a large uncertainty in the ClOOCl
absorption cross sections making it difficult to determine the rate of the ClO-dimer cycle
under twilight conditions. To investigate this, a self-match flight was carried out, in which the
high altitude aircraft Geophysica sampled the same air masses twice, during night and just
after sunrise. Preliminary analysis of the ClO concentration increase measured during the
flight shows reasonable agreement with theoretical calculations based on a number of
different absorption spectra measured in the laboratory. However, based on our results, the
spectrum published by Pope et al.(2007) can be ruled out, and the possibility of
additional ClOOCl absorption bands longwards of 450 nm seems extremely unlikely. |
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