Seasonal Changes in the Thickness of Martian Polar Crater Deposits From the Mars Orbiter Laser Altimeter

Details Seasonal Changes in the Thickness of Martian Polar Crater Deposits From the Mars Orbiter Laser Altimeter Seasonal Changes in the Thickness of Martian Polar Crater Deposits From the Mars Orbiter Laser Altimeter

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p31a0544s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P31A-0544

Mathematics

Logic

3346 Planetary Meteorology (5445, 5739), 5420 Impact Phenomena (Includes Cratering), 5462 Polar Regions, 5464 Remote Sensing

Scientific paper

This study uses near-repeat topographic profiles and gridded data from the Mars Orbiter Laser Altimeter to investigate temporal changes in several ice-filled craters in the North Polar Region of Mars. The craters we investigated are Korolev (73° N, 163° E), "Sasquatch" (77° N, 89° E) and "Frosty" (77° N, 215° E) [Garvin et. al., 2000, Icarus, 144, 329-352]. Profiles are corrected using crossovers that are not affected by seasonal changes. We find that spatially matched but temporally separated MOLA profiles of the central ice deposits within these craters show vertical variation on the order of 1-5 meters. This change in topography temporally correlates to the seasonal deposition and sublimation of frost in the North Polar Region of Mars [Zuber et al., this session] but is locally greater in magnitude. The change is also localized to the south-facing slopes of the ice deposits within the craters. This suggests that up to 5 m of carbon dioxide frost deposition and ablation may be taking place on the south-facing slopes of these craters each Martian year. This rapid change in ice deposit thickness provides a mechanism for geologically swift modification of the polar-layered terrains.

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