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| Titel |
A model study of the temporal behaviour of the emission intensity and rotational temperature of the OH Meinel bands for high-latitude summer conditions |
| VerfasserIn |
M. J. López-González, D. P. Murtagh, P. J. Espy, J. J. López-Moreno, R. Rodrigo, G. Witt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 1 ; Nr. 14, no. 1, S.59-67 |
| Datensatznummer |
250012137
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| Publikation (Nr.) |
 copernicus.org/angeo-14-59-1996.pdf |
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| Zusammenfassung |
| The temporal variation of OH*
emission and weighted rotational temperature has been studied for high-latitude
summer conditions. Observations for 60°N latitude show OH weighted temperatures
that always exceed 145 K even during periods of noctilucent clouds. Using a
one-dimensional model the effects in excited OH concentration produced by
changes in temperature, eddy diffusion, and water concentration have been
analysed. We are forced to conclude that there remains a discrepancy between the
OH temperatures predicted by the model and that obtained from OH*
measurements. An increase in OH* concentration from June to the
beginning of August, followed by a slow decrease during August has been obtained
in agreement with the measurements. The 16-day modulation present in the
measurements was simulated in a simple manner by varying the temperature in the
mesopause region. This variation produces periodic modulations in both OH*
concentration and weighted temperature of 16 days. The results show the
temperature leading the OH* column concentration by three days. This
phase shift is also present in the observations. |
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