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| Titel |
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 |
| VerfasserIn |
M. J. Harris, N. F. Arnold, A. D. Aylward |
| 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 ; 20, no. 2 ; Nr. 20, no. 2, S.225-235 |
| Datensatznummer |
250014358
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| Publikation (Nr.) |
 copernicus.org/angeo-20-225-2002.pdf |
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| Zusammenfassung |
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.
Key words. Atmospheric composition
and structure (middle atmosphere – composition and chemistry) Meterology and
atmospheric dynamics (middle atmosphere dynamics; waves and tides) |
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