Global Distribution of Martian Volatiles During Northern Winter: Mars Odyssey Neutron Spectrometer Results

Details Global Distribution of Martian Volatiles During Northern Winter: Mars Odyssey Neutron Spectrometer Results Global Distribution of Martian Volatiles During Northern Winter: Mars Odyssey Neutron Spectrometer Results

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p42a..08f&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #P42A-08

Physics

5410 Composition, 5415 Erosion And Weathering, 5416 Glaciation, 6225 Mars

Scientific paper

The global distributions of thermal, epithermal, and fast neutron fluxes have been mapped using the Mars Odyssey Neutron Spectrometer during about one month during mid northern winter (centered on Ls = 330 deg.). These fluxes taken together are selectively sensitive to the spatial and stratigraphic distributions of H and CO2. Specific signatures of a variety of compositions that incorporate H and CO2, including their burial beneath a layer of soil containing relatively little hydrogen in the form of water (chosen to be 1 percent by weight) have been reported by Feldman et al. [JGR 98, 20855, 1993]. Comparison of correlated variations of the three energy ranges of neutron flux over the planet reveals the following: 1) The entire domain south of -60 deg. latitude is very rich in hydrogen, 2) This hydrogen rich layer is buried beneath a relatively hydrogen poor overburden, 3) The residual south polar cap is covered by a thick layer of CO2, 4)Two extended portions of Arabia Terra and Amazonis Planitia near the equator contain buried deposits of hydrogen-rich material, 5) The central portion of the north polar cap extending down to about +75 deg. latitude is covered by a thick layer of CO2: and 6) The equatorward margins of the north polar cap extending at places down to about +45 deg. latitude contain buried deposits of hydrogen-rich material. Data and their analyses will be presented.

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