Distribution of Hydrogen in the Near Surface of Mars: Evidence for Subsurface Ice Deposits

@article{Boynton2002DistributionOH,
  title={Distribution of Hydrogen in the Near Surface of Mars: Evidence for Subsurface Ice Deposits},
  author={William V. Boynton and William Charles Feldman and Steven W. Squyres and Thomas H. Prettyman and Johannes Br{\"u}ckner and Larry G. Evans and R. C. Reedy and Richard D. Starr and James R. Arnold and Darrell M. Drake and Peter A. J. Englert and Albert E. Metzger and Igor G. Mitrofanov and Jack I. Trombka and C. d'Uston and Heinrich W{\"a}nke and Olivier Gasnault and David K. Hamara and Daniel M. Janes and Roberto Marcialis and Sylvestre Maurice and Irina Mikheeva and G. Jeffrey Taylor and Robert L. Tokar and C. Shinohara},
  journal={Science},
  year={2002},
  volume={297},
  pages={81 - 85}
}
Using the Gamma-Ray Spectrometer on the Mars Odyssey, we have identified two regions near the poles that are enriched in hydrogen. The data indicate the presence of a subsurface layer enriched in hydrogen overlain by a hydrogen-poor layer. The thickness of the upper layer decreases with decreasing distance to the pole, ranging from a column density of about 150 grams per square centimeter at –42° latitude to about 40 grams per square centimeter at –77°. The hydrogen-rich regions correlate with… 

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Global distributions of thermal, epithermal, and fast neutron fluxes have been mapped during late southern summer/northern winter using the Mars Odyssey Neutron Spectrometer, and portions of the low to middle latitudes indicate subsurface deposits of chemically and/ or physically bound H2O and/or OH.

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