Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgre..11205007n&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue E5, CiteID E05007
Physics
15
Planetary Sciences: Solid Surface Planets: Physical Properties Of Materials, Planetary Sciences: Solid Surface Planets: Remote Sensing, Planetary Sciences: Solid Surface Planets: Surface Materials And Properties, Planetary Sciences: Solar System Objects: Mars, Planetary Sciences: Solar System Objects: Instruments And Techniques
Scientific paper
Nighttime infrared spectral observations returned from the Mars Global Surveyor Thermal Emission Spectrometer (TES) are well suited for determining the subpixel abundance of rocks on the surface of Mars. The algorithm used here determines both the areal fraction of rocky material and the thermal inertia of the fine-grained nonrock component present on the surface. Rock is defined as any surface material that has a thermal inertia >=1250 J m-2 K-1 s-1/2. This can be bedrock, boulders, indurated sediments, or a combination of these on a surface mixed with finer-grained materials. Over 4.9 million observations were compiled to produce the 8 pixels per degree global rock abundance and fine-component inertia maps. Total coverage is ~45% of the planet between latitudes -60 and 60. Less than 1% of the planet has rock abundances greater than 50%, and ~7% of the mapped surface has greater than 30% rocks. Rocky regions on Mars correspond primarily to the high-inertia surfaces observed in thermal inertia data sets. The fine-component inertia data set is used to identify high-inertia exposures that contain few rocks and more homogeneous materials.
Christensen Per Rex
Nowicki S. A.
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