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| Titel |
Annual variation of strato-mesospheric carbon monoxide measured by ground-based Fourier transform infrared spectrometry |
| VerfasserIn |
V. Velazco, S. W. Wood, M. Sinnhuber, I. Kramer, N. B. Jones, Y. Kasai, J. Notholt, T. Warneke, T. Blumenstock, F. Hase, F. J. Murcray, O. Schrems |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2007-02-26), S.1305-1312 |
| Datensatznummer |
250004745
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| Publikation (Nr.) |
 copernicus.org/acp-7-1305-2007.pdf |
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| Zusammenfassung |
| We present long-term time-series of strato-mesospheric CO vertical columns
measured from stations located in Antarctica, mid-latitudes and the Arctic,
covering the period from 1997–2005. The instrument and the measurement
technique allows the separation of tropospheric and strato-mesospheric
contributions to the CO column, therefore providing information on the
chemistry and dynamics both at low and high altitudes. Data from polar
stations show a similar annual variability of strato-mesospheric CO with a
strong maximum in late winter and spring. A small enhancement in late summer
for some stations, which we call the "summer bulge", can be seen
occasionally. Generally, the mid-latitude stations show no significant
annual variability of strato-mesospheric CO columns. Measurements were
compared with a two-dimensional chemistry-transport model of the middle
atmosphere. The annual and latitudinal variations of CO are reproduced well
by a model run including thermospheric CO. Comparison with two model
scenarios show that the polar winter maximum is due solely to downward
transport of thermospheric CO, while CHOx chemistry in the stratosphere
could probably contribute to the summer maximum. |
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