Aeolian Processes and Long Period Climate Change on Mars

Details Aeolian Processes and Long Period Climate Change on Mars Aeolian Processes and Long Period Climate Change on Mars

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p51b0352a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P51B-0352

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0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 5415 Erosion And Weathering, 6225 Mars

Scientific paper

Wind deflation and deposition are powerful agents of surface change in the present Mars climate regime. Recent studies indicate that, while the distribution of regions of potential deflation (or erosion) and deposition is remarkably insensitive to changes in orbital parameters (obliquity, timing of perhelion passage, etc.), rates of eolian surface modification may be highly sensitive to these parameters even if the atmospheric mass remains constant. But atmospheric mass is likely to be sensitive to obliquity, especially if a significant mass of carbon dioxide can be stored in the regolith. Deflation and erosion are highly sensitive to surface pressure, so feedback between orbit variations and surface pressure can greatly enhance the sensitivity of aeolian modification rates to orbital parameters. We use statistics derived from a 1 Gyr orbital integration of the spin axis of Mars, coupled with 3-D global circulation models at a variety of pressures, to explore this feedback. A 1-D energy balance model is employed to illuminate the gross characteristics of long-term wind erosion and deposition on Gyr timescales. Finally, surface textural features in high resolution images from the Mars Global Surveyor Mars Orbital Camera (MOC) are examined in the light of the orbital integrations and model results.

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