Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p31a..05n&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P31A-05
Other
5464 Remote Sensing, 5470 Surface Materials And Properties
Scientific paper
Mars Global Surveyor TES (Thermal Emission Spectrometer) observations have provided a global view of the thermophysical characteristics of the surface of Mars indicating the kinds of processes that have generated and currently modify the Martian surface layer. The global map at 1/8 degree per pixel shows large regions of the planet covered in very low thermal interial material (< 100 J/m2Ks1/2) and often with zero rock abundance. The other striking finding from TES is that medium to high thermal inertia regions (> ~400) typically have at least some rocks present at the surface, and that rock abundances of near 40% are fairly common. This differs somewhat from the Viking IRTM results which at 1 degree per pixel indicated that most low inertia surfaces had a rock abundance of a few percent, the rockiest places were typically less than 30%, and that the thermal inertia is primarily controlled by the fine component inertia. The primary difference between IRTM and TES data is the increase in spatial resolution from 30 km to 3 km, and this difference in data is the main cause for difference between results. The TES results suggest that most places where there is sand, there is rock exposed as well, thus the material between dunes can significantly increase the overall thermal inertia of dune-covered regions. The idea that anywhere sand is present, the active sand removes dust and can expose underlying high thermal inertia material is strengthed by the TES data, but until now, no other observations were available to test the hypothesis. Due to the high spatial resolution of THEMIS (Thermal Emission Imaging System) data (100 m/pixel), we are able to identify small-scale thermophysical units and determine surface temperatures of geomorphic features such as individual dunes, slopes, and interdune material. THEMIS data can be used to help determine the relationships between rocks, sand, and dust, as suggested by results from TES. Global and high-resolution rock abundance results from TES will be presented along with THEMIS data to provide a detailed look at surfaces with mixed thermophysical units.
Christensen Per Rex
Nowicki S. A.
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