Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.953q..31p&link_type=abstract
The First International Conference on Mars Polar Science and Exploration, Proceedings of the Conference held at Camp Allen, TX.
Physics
Atmospheric Circulation, Dust Storms, Mars Atmosphere, Mars Environment, Mars Surface, Storms, Lorentz Transformations, Atmospheric General Circulation Models, Southern Hemisphere, Variability
Scientific paper
We present a simple model of the interaction between the global circulation and dust aimed at explaining the interannual variability of martian global dust storms. The equations of the model are the Lorenz equations, with an additional term that represents seasonal forcing. The parameters of the model are chosen using the Mars GCM results. For the range of parameter values that are suitable for Mars, the model exhibits rapid oscillations in atmospheric circulation and dust loading during early summer in both hemispheres. The oscillations repeat each year and do not reproduce the observed interannual variability. The solutions are consistent with the time of occurrence of the observed global dust storms, but contradict the occurrence of global storms only in the southern hemisphere. We suggest that physical processes not related to the global circulation are responsible for these discrepancies. These processes may include water ice condensation on the dust particles or redistribution of the dust on the surface. We feel that the results of our modeling are useful in distinguishing between processes that are important for the martian dust cycle and can provide guidance for the Mars GCM simulations.
Ingersoll P. A. P. A.
Pankine Alexey
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