Turbulent heating and cooling of the mesopause region and their parameterization

Details Turbulent heating and cooling of the mesopause region and their parameterization Turbulent heating and cooling of the mesopause region and their parameterization

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983angeo...1..359e&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 1, July-Oct. 1983, p. 359-370. Sponsorship: Deutsche Forschungsgemeinschaft.

Mathematics

Logic

1

Atmospheric Heating, Atmospheric Turbulence, Mesopause, Turbulent Heat Transfer, Atmospheric Circulation, Conductive Heat Transfer, Cooling, Parameterization, Turbulent Diffusion, Two Dimensional Models, Vertical Distribution

Scientific paper

A simulation of heating rates due to heat conduction and dissipation is carried out by means of a two-dimensional model of vertical eddy diffusivity and a dissipation parameter. This is done for steady-state conditions and zonally averaged meteorological fields of the upper mesosphere and lower thermosphere with emphasis on the layers between 70 and 100 km altitude. It is found that mean vertical speeds of up to several cm/s are needed for the energy balance when steady-state conditions are assumed. This is seen as implying the existence of mean meridional winds with speeds exceeding 10 to 20 m/s. It is noted that this result is consistent with most of the available mean meridional wind data from ground-based and rocket measurements. The parameters used in this study make possible the simulation of a large circulation cell with uprising motion in the summer hemisphere and downward winds in the winter hemisphere. A tendency of smaller cells forming is noted.

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