Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.g42c..05z&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #G42C-05
Other
1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 5417 Gravitational Fields (1227), 6225 Mars
Scientific paper
The seasonal exchange of CO2 between the atmosphere and cryosphere of Mars modifies the planetary mass distribution and results in small changes in the long-wavelength gravitational field. Over the course of the Martian year ˜18% of the total volatile mass will be exchanged between the atmosphere and the surface, resulting in a re-distribution of ˜ 1 x 10-8 of the total mass of Mars. Changes in the Martian long-wavelength gravity field have been detected from orbiting spacecraft and the challenge is to relate these variations to the CO2 cycle. In the current study we develop an analytical approach to relate gravity field changes to seasonal variations in CO2 ice mass and to the global mean atmospheric surface pressure. We have also performed a direct recovery of temporally-varying cryospheric mass and demonstrate an equivalence to the recovery using low-degree gravity coefficients. In addition, we have estimated gravity anomalies over the poles, as yet another representation of the same phenomenon. We compare our estimates with Viking lander pressure measurements and with predictions from a General Circulation Model (GCM) simulation for a typical Mars year. This combined theoretical and observational approach provides a means of estimating the global-scale volatile mass exchange and global mean pressure on Mars on a routine basis from precise tracking of orbital spacecraft.
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