Spring Defrosting of Martian Polar Regions: Mars Global Surveyor MOC and TES Monitoring of the Richardson Crater Dune Field, 1999-2000

Details Spring Defrosting of Martian Polar Regions: Mars Global Surveyor MOC and TES Monitoring of the Richardson Crater Dune Field, 1999-2000 Spring Defrosting of Martian Polar Regions: Mars Global Surveyor MOC and TES Monitoring of the Richardson Crater Dune Field, 1999-2000

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mpse.conf...34e&link_type=abstract

International Conference on Mars Polar Science and Exploration, p. 34

Physics

2

Mars (Planet), Polar Regions, Mars Surface, Surface Temperature, Southern Hemisphere, Mars Craters, Mars Global Surveyor, Albedo

Scientific paper

Changes in the appearance of a defrosting dune field in the martian southern hemisphere are tracked from late winter into early summer. Changes become noticeable shortly after the dune field emerges into sunlight as winter transitions to spring. These changes, in the form of small dark spots formed on and along the base of the dunes, occur while surface temperatures are still around the freezing point of CO, (-148 K). Most of the changes occur over the course of spring, while temperatures are transitioning from those of frozen CO2 toward the H2O freezing point (-273 K). Late spring and early summer views acquired approx. 2 a.m. local time exhibit higher albedos than approx. 2 p.m. views obtained during the same period, suggesting that frost forms on these surfaces as the sun dips toward the horizon during early morning hours in these seasons. Additional information is contained in original extended abstract.

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