Estimation of martian seasonal co2 mass exchange from geodetic measurements.

Physics

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As much as 30% of Martian atmosphere takes part in the seasonal exchange of mass between the atmosphere and the seasonal polar caps. This large-scale movement results in changes in the distribution of atmospheric mass. The signature of this global-scale seasonal cycle can be found in the variation of gravitational field as well as in the variation of planet's orientation parameters such as polar motion and length of day. By using geodetic measurements (i.e., seasonal variations of the zonal gravity coefficients determined from the Mars Global Surveyor tracking) as input, seasonal C02 mass changes in polar caps can be estimated. The results are in fairly general good agreement with those given by global circulation models despite the uncertainties in gravity coefficients. With the upcoming geodetic missions to Mars, global-scale seasonal and inter-annual mass changes are expected to be determined with a better accuracy.

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