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| Titel |
Partitioning and budget of inorganic and organic chlorine species observed by MIPAS-B and TELIS in the Arctic in March 2011 |
| VerfasserIn |
G. Wetzel, H. Oelhaf, M. Birk, A. Lange, A. Engel, F. Friedl-Vallon, O. Kirner, A. Kleinert, G. Maucher, H. Nordmeyer, J. Orphal, R. Ruhnke, B.-M. Sinnhuber, P. Vogt |
| 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 ; 15, no. 14 ; Nr. 15, no. 14 (2015-07-22), S.8065-8076 |
| Datensatznummer |
250119918
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| Publikation (Nr.) |
 copernicus.org/acp-15-8065-2015.pdf |
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| Zusammenfassung |
| The Arctic winter 2010/2011 was characterized by a persistent vortex with
extremely low temperatures in the lower stratosphere above northern
Scandinavia leading to a strong activation of chlorine compounds (ClOx)
like Cl, Cl2, ClO, ClOOCl, OClO, and HOCl, which rapidly destroyed ozone
when sunlight returned after winter solstice. The MIPAS-B (Michelson
Interferometer for Passive Atmospheric Sounding) and TELIS (TErahertz and
submillimeter LImb Sounder) balloon measurements obtained in northern Sweden
on 31 March 2011 inside the polar vortex have provided vertical profiles of
inorganic and organic chlorine species as well as diurnal variations of ClO
around sunrise over the whole altitude range in which chlorine has been
undergoing activation and deactivation. This flight was performed at the end
of the winter during the last phase of ClOx deactivation. The complete
inorganic and organic chlorine partitioning and budget for 31 March 2011,
assumed to be representative for the late-winter Arctic stratosphere, has
been derived by combining MIPAS-B and TELIS simultaneously observed
molecules. A total chlorine amount of 3.41 ± 0.30 parts per billion by
volume is inferred from the measurements (above 24 km). This value is
in line with previous stratospheric observations carried out outside the
tropics confirming the slightly decreasing chlorine amount in the
stratosphere. Observations are compared and discussed with the output of a
multi-year simulation performed with the chemistry climate model EMAC
(ECHAM5/MESSy Atmospheric Chemistry). The simulated stratospheric total
chlorine amount is in accordance with the MIPAS-B/TELIS observations, taking
into account the fact that some chlorine source gases and very short-lived
species are not included in the model. |
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