Global distribution of near-surface hydrogen on Mars

Details Global distribution of near-surface hydrogen on Mars Global distribution of near-surface hydrogen on Mars

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgre..10909006f&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue E9, CiteID E09006

Physics

114

Planetology: Solid Surface Planets: Composition, Planetology: Solid Surface Planets: Glaciation, Planetology: Solid Surface Planets: Polar Regions, Planetology: Solar System Objects: Mars

Scientific paper

Neutron data observed using the Neutron Spectrometer aboard 2001 Mars Odyssey provide a lower limit to the global inventory of Martian water-equivalent hydrogen. Hydrogen-rich deposits ranging between about 20% and 100% water-equivalent by mass are found poleward of +/-50° latitude, and less rich, but significant, deposits are found at near-equatorial latitudes. The equatorial deposits between +/-45° latitude range between 2% and 10% water-equivalent hydrogen by mass and reach their maximum in two regions that straddle the 0-km elevation contour. Higher water abundances, up to ~11%, are required in subsurface regolith of some equatorial regions if the upper 10 g/cm2 of regolith is desiccated, as suggested on average by comparison of epithermal and fast neutron data. The hydrogen contents of surface soils in the latitude range between 50° and 80° north and south are equal within data uncertainties. A lower-limit estimate of the global inventory of near surface hydrogen amounts to a global water layer about 14 cm thick if the reservoir sampled from orbit is assumed to be 1 m thick.

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