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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 1
Ann. Geophys., 14, 59–67, 1996
© European Geosciences Union 1996
Ann. Geophys., 14, 59–67, 1996
© European Geosciences Union 1996

  31 Jan 1996

31 Jan 1996

A model study of the temporal behaviour of the emission intensity and rotational temperature of the OH Meinel bands for high-latitude summer conditions

M. J. López-González, D. P. Murtagh, P. J. Espy, J. J. López-Moreno, R. Rodrigo, and G. Witt M. J. López-González et al.

Abstract. 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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