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A study into the effect of the diurnal tide on the structure of the background mesosphere and thermosphere using the new coupled middle atmosphere and thermosphere (CMAT) general circulation model

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journal contribution
posted on 08.12.2009, 16:24 by M. J. Harris, N. F. Arnold, A. D. Aylward
A new coupled middle atmosphere and thermosphere general circulation model has been developed, and some first results are presented. An investigation into the effects of the diurnal tide upon the mean composition, dynamics and energetics was carried out for equinox conditions. Previous studies have shown that tides deplete mean atomic oxygen in the upper mesosphere-lower thermosphere due to an increased recombination in the tidal displaced air parcels. The model runs presented suggest that the mean residual circulation associated with the tidal dissipation also plays an important role. Stronger lower boundary tidal forcing was seen to increase the equatorial local diurnal maximum of atomic oxygen and the associated 0(1S) 557.7 nm green line volume emission rates. The changes in the mean background temperature structure were found to correspond to changes in the mean circulation and exothermic chemical heating.

History

Citation

Annales Geophysicae: Atmospheres Hydrospheres and Space Science, 2002, 20, pp.225-236

Published in

Annales Geophysicae: Atmospheres Hydrospheres and Space Science

Publisher

European Geosciences Union (EGU), Copernicus Publications, Springer Verlag

Copyright date

2002

Available date

08/12/2009

Publisher version

http://www.ann-geophys.net/20/225/2002/angeo-20-225-2002.html

Language

en