Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..529f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, June 1986, p. 529-544.
Physics
19
Atmospheric Boundary Layer, Middle Atmosphere, Radiant Cooling, Radiative Heat Transfer, Atmospheric Circulation, Atmospheric Heating, Conductive Heat Transfer, Diurnal Variations, Solar Position, Solar Terrestrial Interactions
Scientific paper
Near the solstice and equinox, the altitude-latitude distributions of cooling rate in the 15-micron CO2 and 9.6 micron O3 bands, and in the rotational H2O band, have been calculated. The atmosphere near 75 km in the vicinity of the equator is heated due to thermal radiation transfer in all seasons. The atmosphere is also heated around the pole near the mesopause in spring, and in autumn it is slightly cooled. Estimates are given of the influence of tropospheric clouds on radiative cooling above 25 km and of additional cooling of the lower thermosphere caused by the propagation of gravity waves and tidal modes. Conclusions have been drawn on the dynamics of the middle atmosphere and its contribution to the thermal regime. The eddy heat conductivity is not the only important global mean sink of energy in the turbulent layer of the lower thermosphere. From spring to autumn in the hemispheric upper mesosphere there are at least two cells of meridional circulation with upward air motion near the equator and the pole. It is possible that the cell of meridional circulation observed near the equinox in the lower thermosphere of the middle and low latitudes is stimulated by air heating due to the dissipation of semidiurnal tidal energy.
Fomichev Victor I.
Kutepov Andrey
Shved Gustav M.
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