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| Titel |
Subtropical trace gas profiles determined by ground-based FTIR spectroscopy at Izaña (28° N, 16° W): Five-year record, error analysis, and comparison with 3-D CTMs |
| VerfasserIn |
M. Schneider, T. Blumenstock, M. P. Chipperfield, F. Hase, W. Kouker, T. Reddmann, R. Ruhnke, E. Cuevas, H. Fischer |
| 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. 1 ; Nr. 5, no. 1 (2005-01-24), S.153-167 |
| Datensatznummer |
250002214
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| Publikation (Nr.) |
 copernicus.org/acp-5-153-2005.pdf |
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| Zusammenfassung |
| Within the framework of the NDSC (Network for the Detection of
Stratospheric Change) ground-based FTIR solar absorption spectra
have been routinely recorded at Izaña Observatory
(28° N, 16° W) on Tenerife Island since March
1999. By analyzing the shape of the absorption lines, and their
different temperature sensitivities, the vertical distribution of
the absorbers can be retrieved. Unique time series of subtropical
profiles of O3, HCl, HF, N2O, and CH4 are presented. The
effects of both dynamical and chemical annually varying trace gas
cycles can be seen in the retrieved profiles. These include
enhanced upwelling and photochemistry in summer and a more
disturbed atmosphere in winter, which are typical of the
subtropical stratosphere. A detailed error analysis has been
performed for each profile. The output from two different
three-dimensional (3-D) chemical transport models (CTMs), which
are forced by ECMWF analyses, are compared to the measured
profiles. Both models agree well with the measurements in tracking
abrupt variations in the atmospheric structure, e.g. due to
tropical streamers, in particular for the lower stratosphere.
Simulated and measured profiles also reflect similar dynamical and
chemical annual cycles. However, the differences between their
mixing ratios clearly exceed the error bars estimated for the
measured profiles. Possible reasons for this are discussed. |
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