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| Titel |
Midlatitude ClO during the maximum atmospheric chlorine burden: in situ balloon measurements and model simulations |
| VerfasserIn |
B. Vogel, R. Müller, A. Engel, J.-U. Grooß, D. Toohey, T. Woyke, F. Stroh |
| 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 ; 5, no. 6 ; Nr. 5, no. 6 (2005-06-24), S.1623-1638 |
| Datensatznummer |
250002909
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| Publikation (Nr.) |
 copernicus.org/acp-5-1623-2005.pdf |
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| Zusammenfassung |
| Chlorine monoxide (ClO) plays a key role in stratospheric ozone loss
processes at midlatitudes. We present two balloon-borne in situ
measurements of ClO conducted in northern hemisphere midlatitudes
during the period of the maximum of total inorganic chlorine loading
in the atmosphere. Both ClO measurements were conducted on board the
TRIPLE balloon payload, launched in November 1996 in León, Spain, and
in May 1999 in Aire sur l'Adour, France. For both flights a ClO daylight and
night-time vertical profile was derived over an altitude range of
approximately 15-35 km. ClO mixing ratios are compared to
model simulations performed with the photochemical box model version
of the Chemical Lagrangian Model of the Stratosphere
(CLaMS). Simulations along 24-hour backward trajectories were
performed to study the diurnal variation of ClO in the midlatitude
lower stratosphere. Model simulations for the flight launched in
Aire sur l'Adour 1999 show an excellent agreement with the ClO measurements.
For the flight launched in León 1996, an overall good agreement is
found, whereas the flight is characterized by a more complex dynamical
situation due to a possible mixture of vortex and non-vortex air. We
note that for both flights at solar zenith angles greater than
86°-87° simulated ClO mixing ratios are
higher than observed ClO mixing ratios. However, the present
findings indicate that no substantial uncertainties exist in
midlatitude chlorine chemistry of the stratosphere. |
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