Photo-induced fractionation of water isotopomers in the Martian atmosphere

Details Photo-induced fractionation of water isotopomers in the Martian atmosphere Photo-induced fractionation of water isotopomers in the Martian atmosphere

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3657c&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 24, p. 3657-3660

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Geochemistry: Planetary Geochemistry, Planetology: Solid Surface Planets: Atmospheres-Composition And Chemistry, Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solar System Objects: Mars

Scientific paper

The history and size of the water reservoirs on early Mars can be constrained using isotopic ratios of deuterium to hydrogen. We present new laboratory measurements of the ultraviolet cross-sections of H2O and its isotopomers, and modeling calculations in support of a photo-induced fractionation effect (PHIFE), that reconciles a discrepancy between past theoretical modeling and recent observations. This supports the hypothesis that Mars had an early warm atmosphere and has lost at least a 50-m global layer of water. Likely applications of PHIFE to other planetary atmospheres are sketched.

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