Martian global‐scale CO2 exchange from time‐variable gravity measurements

[1] The Martian CO2 cycle causes variations in the gravity field that can be detected by an orbiting spacecraft. The time-variable ΔC20 and ΔC30 reported from the radio tracking analysis of Mars Global Surveyor are used to calculate the seasonal changes in the polar cap masses as well as in the global atmospheric pressure. The results show a good agreement with the model-dependent solutions of general circulation models and CO2 thickness observations of the High Energy Neutron Detector on board Mars Odyssey.