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| Titel |
Active ClOx species and ClONO2 as measured by MIPAS-B inside the Arctic vortex in winters 2001 and 2003 |
| VerfasserIn |
G. Wetzel, H. Oelhaf, R. Ruhnke, F. Friedl-Vallon, A. Kleinert, G. Maucher, M. Birk, G. Wagner |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022730
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| Zusammenfassung |
| Active chlorine species play a dominant role in the catalytic destruction of stratospheric
ozone in the polar vortices during the late winter and early spring seasons. Under this aspect,
arctic stratospheric limb emission measurements carried out by the balloon version of the
Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B) from Kiruna
(Sweden) on 11 January 2001 and 20/21 March 2003 have been analyzed with regard to
the chlorine reservoir species ClONO2 and the active species ClO and ClOOCl
(Cl2O2). High values of active chlorine (ClOx) of roughly 2.3 ppbv at 20 km were
observed by MIPAS-B in the arctic vortex on 11 January 2001. While nighttime
ClOOCl shows enhanced values of up to 1.1 ppbv at 20 km, ClONO2 mixing ratios
are less than 0.1 ppbv at this altitude. In contrast, high ClONO2 mixing ratios of
nearly 2.4 ppbv at 20 km have been observed in the late winter arctic vortex on 20
March 2003. No significant ClOx amounts are visible on this date. Calculations
with the 3-dimensional Karlsruhe Simulation model of the Middle Atmosphere
(KASIMA) show less chlorine activation compared to the measurements in January
2001. The model generally underestimates ClONO2 mixing ratios in favour of HCl. |
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