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| Titel |
Observation of unusual chlorine activation by ground-based infrared and microwave spectroscopy in the late Arctic winter 2000/01 |
| VerfasserIn |
T. Blumenstock, G. Kopp, F. Hase, G. Hochschild, S. Mikuteit, U. Raffalski, R. Ruhnke |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 4 ; Nr. 6, no. 4 (2006-03-20), S.897-905 |
| Datensatznummer |
250003620
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| Publikation (Nr.) |
 copernicus.org/acp-6-897-2006.pdf |
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| Zusammenfassung |
| During the Arctic winter of 2000/01, ground-based FTIR and millimetre-wave
measurements revealed significant amounts of ClO over Kiruna after the final
warming in February 2001. In fact, column amounts of ClO were still
increased in March 2001 when temperatures were about 20K above the PSC
(Polar Stratospheric Clouds) threshold. At these temperatures, chlorine
activation due to heterogeneous processes on PSCs is not possible even in
the presence of strong lee wave effects. In order to discuss possible
reasons of this feature, time series of other chemical species will be
presented and discussed, too. Measurements of HF and COF2 indicated
that vortex air was still observed in mid-March 2001. Since the time series
of HNO3 column amounts do not give any evidence of a denitrification
later than 11 February, chlorine activation persisting for several weeks
after the presence of PSCs due to denitrification is rather unlikely. The
photolysis of ClONO2-rich air which had been formed at the end of
February and beginning of March 2001 as well as chlorine activation due to
the presence of an unusual aerosol layer are discussed as possible causes of
the increased ClO column amounts after the final warming. |
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