The role of horizontally-averaged nonlinear heat transport in zonally-averaged models of the middle atmosphere

Details The role of horizontally-averaged nonlinear heat transport in zonally-averaged models of the middle atmosphere The role of horizontally-averaged nonlinear heat transport in zonally-averaged models of the middle atmosphere

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3..187m&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 3, Mar.-Apr. 1985, p. 187-194. NSF-supported research; Deutsche Forschungsgemeinschaf

Physics

Atmospheric Circulation, Atmospheric Models, Heat Transfer, Middle Atmosphere, Atmospheric Heating, Cooling, Mass Balance, Meridional Flow, Ozone, Radiant Heating, Temperature Distribution

Scientific paper

Observed mean-temperature and mean-ozone fields, and solar-heating and IR-cooling parameterizations are used to obtain numerical solutions for the diabatic zonally-averaged vertical and meridional winds in the 10-110 km height range. An observed latitude-dependent ozone distribution is used for calculating the radiative heating. It is shown that in order to fulfill the mass-balance requirements in the altitude region of the upper mesosphere and lower thermosphere, horizontally-averaged heating-rate imbalances of more than 2K/day are necessary. Dynamical transport is found to cause the horizontally-averaged temperature to depart from the radiative equilibrium condition unless additional heating/cooling processes are introduced into the energy equation to compensate the transport effects. As a consequence of the calculated strong vertical meridional circulation, transport of cold air from the summer mesopause region to low latitudes is compensated by a region of subsidence in midlatitudes.

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