Map of Upper Regolith Layer Hydrogen Content Measured Using the Mars Odyssey Neutron Spectrometer

Details Map of Upper Regolith Layer Hydrogen Content Measured Using the Mars Odyssey Neutron Spectrometer Map of Upper Regolith Layer Hydrogen Content Measured Using the Mars Odyssey Neutron Spectrometer

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p53a1495f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P53A-1495

Physics

[5419] Planetary Sciences: Solid Surface Planets / Hydrology And Fluvial Processes, [5422] Planetary Sciences: Solid Surface Planets / Ices, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

Thermal and epithermal neutron counting rates measured by the Mars Odyssey Neutron Spectrometer (MONS) have been used to generate maps of the water-equivalent hydrogen (WEH) content of a semi-infinite lower layer, Wdn, buried at depth, D, below the surface, under the assumption of a WEH content of an upper layer, Wup, equal to 1%, 2%, and 5% by weight [Diez et al., Icarus, 2008]. We have just developed a technique to determine Wup self consistently from the fast and epithermal neutron counts of MONS. The resultant map of Wup shows considerable structure. Values higher than 3.5 wt % are localized at (1) the Phoenix landing site and neighboring terrain to the southwest in Arcadia Planitia, (2) along the dichotomy boundary extending from Gusev Crater through Medusae Fossae to the Tharsis Plateau, (3) a region southeast of Hellas that is near the antipode of the Phoenix site, and (4) in central Arabia Terra. Correlated variations between Wup and Wdn is variable over the planet. It is generally high between ±(46 to 60) latitude, which have linear correlation coefficients, R, between 0.77 and 0.81. Between ±(60 to 74) latitude R is generally high with the exception of a range of longitudes in each latitude zone where Wup gets very small yet Wdn remains high. And between (-46 to +46) latitude, although both Wup and Wdn vary significantly, the linear correlation between them is generally poor, R=0.32.

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