Mars atmospheric D/H - Consistent with polar volatile theory?

Details Mars atmospheric D/H - Consistent with polar volatile theory? Mars atmospheric D/H - Consistent with polar volatile theory?

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.1475j&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Feb. 10, 1990, p. 1475-1480.

Mathematics

Logic

18

Atmospheric Composition, Deuterium, Hydrogen, Mars Atmosphere, Polar Caps, Water Vapor, Photochemical Reactions, Volatility, Water, Mars, Atmosphere, Deuterium, Hydrogen, Isotopic Ratios, Volatiles, Theoretical Studies, Polar Regions, Escape, Enrichment, Abundance, Photochemistry, Models, Water, Deposits, Timescale, Polar Caps, Obliquity, Sublimation, Water Vapor, Cycles

Scientific paper

Current theories on the Martian water history are discussed on the basis of data for the D/H ratio in the Martian atmosphere (which was found to be enhanced by a factor of 6 + or - relative to the value on earth). In particular, the calculations of Yung et al. (1988), on the basis of their photochemical model, are found to be inconsistent with current theories for the evolution of the polar deposits on Mars. While the photochemical model predicts that about 95 percent of the Martian water has escaped over geologic time and the nonatmospheric reservoir is now only 02 m thick, the polar volatile theory suggest that polar deposits contain the equivalent of tens of meters of water, requiring a more rapid escape of H and D to space than predicted by the photochemical model to match the observed D/H ratio. The paper examines the behavior of the polar caps and the atmospheric water vapor over geologic time and the loss of H and D to space. It is concluded that, at present, it is premature to accept a specific history for water on Mars.

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