Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4634f&link_type=abstract
Journal of Geophysical Research, vol. 84, Aug. 10, 1979, p. 4634-4642.
Physics
6
Annual Variations, Mars Surface, Polar Regions, Vortices, Wind Measurement, Angular Momentum, Boussinesq Approximation, Carbon Dioxide, Mass Transfer, Momentum Transfer, Planetary Mapping
Scientific paper
Observations of eolian features in the south polar region of Mars show strikingly axisymmetric patterns. The paper presents an explanation for the patterns in terms of the simplest dynamical model possible. Piraglia's (1975) model is simplified by neglecting compressibility and by assuming a cylindrical rather than spherical geometry, but this model is extended by including the nonlinear transport terms (of order Rossby number) and the seasonal mass transfer terms. The proposed model is therefore focused on determining the surface stress in polar regions rather than the atmospheric structure. The model is described, the parameter values are discussed, and the solutions are compared with observations. It is shown that the model predicts seasonal behavior which can be divided into four periods: formation of the south polar cap, its maximum extent, sublimation, and absence.
French Richard G.
Gierasch Peter J.
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