Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.363..428g&link_type=abstract
Nature (ISSN 0028-0836), vol. 363, no. 6428, p. 428-431.
Astronomy and Astrophysics
Astrophysics
39
Atmospheric Composition, Atmospheric Moisture, Deuterium, Hydrogen, Venus Atmosphere, Gas Evolution, Outgassing, Planetary Evolution, Volcanoes, Venus, Atmosphere, Deuterium, Hydrogen, Water, Origin, Source, Flux, Abundance, Isotopic Ratios, Escape, Outgassing, Mantle, Fractionation, Resurfacing, Theoretical Studies, Timescale
Scientific paper
The abundance ratio of D relative to H in the Venus atmosphere is 120 times greater than that of the earth. A recent reanalysis of collisional ejection has increased estimates of the D escape efficiency by a factor of 10, implying that, for a steady-state Venusian water budget, the D/H ratio of the source water must be 10-15 times higher than that of the earth. It is presently suggested that these observations can be understood either as a result of continuous outgassing from a highly fractionated mantle source, or Rayleigh fractionation after massive outgassing from catastrophic resurfacing of the planet over the last 0.5-1.0 Gyr.
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