Past and present water budget of Venus

Details Past and present water budget of Venus Past and present water budget of Venus

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6083d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. E4, April 25, 1992, p. 6083-6091.

Physics

38

Atmospheric Composition, Isotope Effect, Mass Spectroscopy, Pioneer Venus Spacecraft, Venus Atmosphere, Water Vapor, Deuterium, Hydrogen, Venus Clouds, Water Management

Scientific paper

Attention is given to a detailed analysis of Pioneer Venus large-probe neutral mass spectrometer data which confirm an earlier report that the abundance of Venus deuterium relative to hydrogen is two orders of magnitude larger than that of terrestrial deuterium. The D/H ratio in the bulk atmosphere of Venus today is found to be between 0.014 and 0.02. The argument that present-day HDO can be in a steady state with exogenous (cometary) sources is based on an underestimate of the hydrogen abundance and an overestimate of current escape rates. The large isotope ratio requires that Venus once had above-surface water amounting to at least a few tenths of a percent of a terrestrial ocean and has since lost almost all of the associated hydrogen.

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