Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p31a0120b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P31A-0120
Other
5422 Ices, 5460 Physical Properties Of Materials, 5464 Remote Sensing, 5494 Instruments And Techniques, 6225 Mars
Scientific paper
Many studies have determined surface thermal inertia using single temperature measurements and thermal models, which typically assume a vertically and laterally homogenous surface. While these studies have produced extremely useful results, it is possible to derive more detailed information regarding surface heterogeneities using seasonal temperature measurements. Seasonal measurements also allow deeper probing into the subsurface than that based on diurnal temperature measurements. This is due to the longer seasonal energy cycle, which allows for thermal properties at greater depths to influence the change in surface temperatures. Sensitivities are greatest to seasonal energy cycles at high latitudes where the cycle is most significant and diurnal effects are reduced. High latitude Thermal Emission Spectrometer (TES) seasonal temperature measurements display clear evidence of a high inertia subsurface layer that is responsible for relatively elevated nighttime temperatures in the fall season. This high inertia layer is consistent with buried water ice that has been inferred by the elevated hydrogen levels detected by the Mars Odyssey Gamma Ray Spectrometer (GRS) suite of instruments. Unfortunately, though layering is clearly apparent, the sensitivity to its depth is low when the inertia of the overlying covering material is left as a free parameter. Thermal Emission Imaging System (THEMIS) data provides precise (but not as accurate as TES data) surface temperature information in image format. By observing the relative temperature response of surfaces within an image at different seasons, it is possible to determine the relative ice table depth within an area at 100m/pixel sampling. For example, kilometer scale mounds present within patterned ground within the proposed Phoenix landing site B region cool off more quickly than the surrounding terrain throughout the fall season. By observing the temperature difference between these mounds and the surrounding terrain, it is possible to determine that they have a relatively high inertia ground cover, but with a subsurface water ice layer that is at a significantly greater depth than the surrounding area. High resolution subsurface water ice distributions are a potentially useful application of thermal imagery that compliments other datasets such as the GRS results.
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