Cometary water on Venus - Implications of stochastic impacts

Details Cometary water on Venus - Implications of stochastic impacts Cometary water on Venus - Implications of stochastic impacts

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988icar...74...21g&link_type=abstract

(Conference on the Origin and Evolution of Planetary and Satellite Atmospheres, Tucson, AZ, Mar. 10-14, 1987) Icarus (ISSN 0019-

Physics

33

Abundance, Comets, Stochastic Processes, Venus Atmosphere, Water, Hydrogen Isotopes, Isotopic Enrichment, Planetary Evolution, Comets, Water, Venus, Impacts, Escape, Hydrogen, Models, Abundance, Source, Deuterium, Isotopic Ratios, Injection, Flux, Evolution, Hypotheses

Scientific paper

Attention is given to a Venus water abundance model, incorporating a stochastic cometary source and nonthermal hydrogen escape, that reproduces both the near-steady-state balance between escape loss and infall replenishment implied by Venus' short water lifetime, and the consistency of the observed deuterium-to-hydrogen ratio with a steady state. It is shown that the stochastic variability of each of these quantities is large. Water's quasi-steady state on Venus is judged to be mediated by comet impacts, leading to an obscuration of the early water history of Venus by the history of random impacts.

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