Venus methane and water

Details Venus methane and water Venus methane and water

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..591d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 7, p. 591-594.

Physics

14

Atmospheric Chemistry, Atmospheric Composition, Methane, Venus Atmosphere, Water Vapor, Contamination, Deuterium, Instrument Errors, Mass Spectrometers, Sensitivity, Venus, Methane, Water, Atmosphere, Spacecraft Observations, Pvo Mission, Onms Instrument, Isotopic Ratios, Deuterium, Water Vapor, Abundance, Mixing, Hydrogen, Equipment, Technical Aspects

Scientific paper

Data collected by the Pioneer Venus Large Probe Neutral Mass Spectrometer are presented and discussed. Results indicate the presence of a large amount of methane in the Venus atmosphere from 60 km to the surface. Deuterium transfer from atmospheric HDO to poorly deuterated methane may account for the puzzling apparent gradient in the water vapor mixing ration below 10 km. Deuterium transfer within the mass spectrometer may cause reduction in the apparent ratio of HDO to H2O. Accounting for the deuterium atoms leads to a revised water vapor mixing ratio of 28 ppm. Arguments against the methane detected being purely atmospheric are overwhelming. The methane may have been generated by a reaction between a highly deuterated atmospheric constituent and a poorly deuterated instrumental contaminant.

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