A Martian general circulation experiment with large topography

Computer Science

Scientific paper

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Atmospheric Circulation, Atmospheric Models, Carbon Dioxide Concentration, Mars Atmosphere, Angular Momentum, Atmospheric Boundary Layer, Atmospheric Heating, Geostrophic Wind, Primitive Equations, Topography, Viking Lander Spacecraft, Angular Momentum, Transport, Torques, Meteorology, Waves, Spectrum, Condensation, Solar Flux, Comparisons, Wavelengths, Eddies, Dynamics, Baroclinity, Mars, Circulation, Experiments, Topography, Models, Atmosphere, Simulations, Heating, Latitudes, Pressure, Albedo, Stratosphe

Scientific paper

A three-layer general circulation model of the Martian atmosphere is described, and the assumptions governing the model are discussed. The simulated, zonally averaged circulation is found to have only limited sensitivity to differences between this model and an earlier general circulation model; this circulation compares reasonably well with observations. It is also found that the meridional mass flow produced by the seasonal condensation of CO2 in the winter polar region has a major influence on the circulation; owing to the weak influence of atmospheric heat transport, however, the mass flow is governed almost entirely by radiation. Quasi-barotropic stationary waves, which are forced kinematically by the topography and which resemble topographically forced terrestrial planetary waves, are generated by the model in the winter hemisphere region of strong eastward flow, while baroclinic stationary waves are thermally forced by topography in the tropics and summer subtropics. It is also concluded that transient baroclinically unstable waves, of somewhat lower dominant wavenumber than those found on the earth, are generated in winter midlatitudes; their amplitudes, wavenumbers, and phase speeds closely agree with what has been deduced from the Viking lander observations.

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