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The thermal inertia of Mars from the Mars Global Surveyor Thermal Emission Spectrometer

Journal of Geophysical Research E: Planets

By:
, , , , , and
DOI: 10.1029/1999JE001088

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Abstract

We have used Mars Global Surveyor (MGS) Thermal Emission Spectrometer thermal emission measurements to derive the thermal inertia of the Martian surface at the ∼100-km spatial scale. We have validated the use of nighttime-only measurements to derive thermal inertia as well as the use of a single wavelength band versus bolometric thermal emission measurements. We have also reanalyzed the Viking Infrared Thermal Mapper data set in a similar manner in order to allow a direct comparison between the two. Within the uncertainties of the fit of the data to the model, and the uncertainties inherent in the model, the thermal inertia has not changed substantially in the 21 years between the Viking and the MGS measurements. Although some differences are seen, they are most likely due to changes in albedo during the intervening years or to residual effects of airborne dust that are not fully accounted for in the thermal models. The thermal inertia values that we derive, between about 24 and 800 J m-2 s-1/2 K-1, are thought to better represent the actual thermal inertia of the Martian surface than previous estimates.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The thermal inertia of Mars from the Mars Global Surveyor Thermal Emission Spectrometer
Series title:
Journal of Geophysical Research E: Planets
DOI:
10.1029/1999JE001088
Volume
105
Issue:
E4
Year Published:
2000
Language:
English
Publisher:
American Geophysical Union
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geophysical Research E: Planets
First page:
9643
Last page:
9652
Number of Pages:
10