Simulations of the general circulation of the Martian atmosphere. I - Polar processes

Physics

Scientific paper

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Atmospheric Circulation, Atmospheric General Circulation Models, Mars Atmosphere, Planetary Meteorology, Polar Caps, Three Dimensional Models, Carbon Dioxide, Frost, Infrared Imagery, Primitive Equations, Solar Radiation, Mars, Simulations, Circulation, Atmosphere, Polar Regions, Altitude, Numerical Methods, Meteorology, Radiative Effects, Dust, Radiation, Seasonal Variations, Optical Properties, Depth, Experiments, Latitude, Carbon Dioxide, Condensation, Clouds, Symmetry, Heating, Calculations, Temperature

Scientific paper

Numerical simulations of the Martian atmosphere general circulation are carried out for 50 simulated days, using a three-dimensional model, based on the primitive equations of meteorology, which incorporated the radiative effects of atmospheric dust on solar and thermal radiation. A large number of numerical experiments were conducted for alternative choices of seasonal date and dust optical depth. It was found that, as the dust content of the winter polar region increased, the rate of atmospheric CO2 condensation increased sharply. It is shown that the strong seasonal variation in the atmospheric dust content observed might cause a number of hemispheric asymmetries. These asymmetries include the greater prevalence of polar hoods in the northern polar region during winter, the lower albedo of the northern polar cap during spring, and the total dissipation of the northern CO2 ice cap during the warmer seasons.

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