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A new coupled middle\ud atmosphere and thermosphere general circulation model has been developed, and\ud some first results are presented. An investigation into the effects of the\ud diurnal tide upon the mean composition, dynamics and energetics was carried out\ud for equinox conditions. Previous studies have shown that tides deplete mean\ud atomic oxygen in the upper mesosphere-lower thermosphere due to an increased\ud recombination in the tidal displaced air parcels. The model runs presented\ud suggest that the mean residual circulation associated with the tidal\ud dissipation also plays an important role. Stronger lower boundary tidal forcing\ud was seen to increase the equatorial local diurnal maximum of atomic oxygen and\ud the associated 0(<sup>1</sup>S) 557.7 nm green line volume emission rates. The\ud changes in the mean background temperature structure were found to correspond\ud to changes in the mean circulation and exothermic chemical heating.  <b>Key words. </b>Atmospheric composition\ud and structure (middle atmosphere – composition and chemistry) Meterology and\ud atmospheric dynamics (middle atmosphere dynamics; waves and tides

annales geophysicae

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