Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.u61b..04f&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #U61B-04
Physics
5410 Composition, 6225 Mars
Scientific paper
Maps of thermal, epithermal, and fast neutron fluxes equatorward of +/- 40 degrees latitude were studied to determine the abundance of hydrogen and its near-surface stratigraphy. Large areas centered on Arabia Terra and 180 degrees east longitude near the equator are found to contain enhanced hydrogen abundances that amount to between 3.5 and 7.5 percent water-equivalent hydrogen. The thermal and fast fluxes indicate that these deposits are buried below about 30 g/cm2 of hydrogen-poor soil. This spatial distribution of hydrogen deposits cannot be explained by the general north-south latitude gradient of water vapor that is in the present Martian atmosphere, thereby requiring different climatic conditions in the relatively recent past. A possibility is the diffusion of water vapor from a relatively water-rich atmosphere that is predicted to develop during periods of high obliquity encountered during the past several million years.
Boynton Willam V.
Feldman William C.
Prettyman Thomas H.
Tokar Robert L.
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