Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....6709k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #6709
Physics
Scientific paper
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.
Dehant Véronique
Duron J.
Karatekin Ö.
Rosenblatt Pascal
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