Some Experiments with a Zonally Averaged Climate Model

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Abstract
A simple, zonally averaged numerical model is developed for simulating certain features of the annual mean climate of the Northern Hemisphere. The model is based on the two-level quasi-geostrophic potential vorticity system of equations and a surface beat balance equation. Ale main output consists of the latitudinal variations of temperature at the surface and 500 mb and of zonal wind at 250 and 750 mb. Meridional transport of quasi-geostrophic potential vorticity is simulated by an eddy ~ process using exchange coefficients based on observational data. Solar radiative processes included are absorption by water vapor, ozone and cloud particles, scattering by air molecules and clouds, and reflection by the surface. Longwave radiative processes include absorption and emission by water vapor, carbon dioxide and clouds. Other beat transfer processes–convection, evaporation, condensation and ocean currents–are pammeterized. Using present boundary conditions, the model is used to compute the present cl... Abstract A simple, zonally averaged numerical model is developed for simulating certain features of the annual mean climate of the Northern Hemisphere. The model is based on the two-level quasi-geostrophic potential vorticity system of equations and a surface beat balance equation. Ale main output consists of the latitudinal variations of temperature at the surface and 500 mb and of zonal wind at 250 and 750 mb. Meridional transport of quasi-geostrophic potential vorticity is simulated by an eddy ~ process using exchange coefficients based on observational data. Solar radiative processes included are absorption by water vapor, ozone and cloud particles, scattering by air molecules and clouds, and reflection by the surface. Longwave radiative processes include absorption and emission by water vapor, carbon dioxide and clouds. Other beat transfer processes–convection, evaporation, condensation and ocean currents–are pammeterized. Using present boundary conditions, the model is used to compute the present cl...

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