Mathematics – Logic
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9514531z&link_type=abstract
(American Geophysical Union and Geological Society of America, International Conference on Mars, 4th, Tucson, AZ, Jan. 10-13, 19
Mathematics
Logic
9
Mars Environment, Mars Surface, Planetary Composition, Radar Measurement, Water, Annual Variations, Astronomical Models, Brines, Reflectance
Scientific paper
The 1971 and 1973 Goldstone 12.6-cm radar observations of Mars are separate data sets which include reflectivity as a function of latitude, longitude, and season. It has been argued that secular reflectivity variations of Mars' surface are indicated by the data and that shallow subsurface melting is the causal mechanism most compatible with the observations; however, the melting hypothesis conflicts with accepted notions of the state and distribution of water on Mars. The data are examined to identify temporal and spatial domains within which statistically significant changes in measured reflectivity are clustered. Brines which might satisfy the best supported reflectivity variations are out of equilibrium with the chemical megaenvironment. It is unclear whether such a brine, if emplaced in the Martian regolith at a depth shallow enough to affect the radar reflectivity, could survive even a single freeze-thaw cycle. Some combination of unique scattering properties or some as yet unidentified process other than melting is responsible for any genuine reflectivity variations.
Fanale Fraser P.
Roth Ladislav E.
Zent Aaron P.
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