Deuterium on Venus - Observations from earth

Details Deuterium on Venus - Observations from earth Deuterium on Venus - Observations from earth

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...251..547d&link_type=abstract

Science (ISSN 0036-8075), vol. 251, Feb. 1, 1991, p. 547-549.

Computer Science

Sound

64

Abundance, Deuterium, Space Observations (From Earth), Venus Atmosphere, Altitude, Heavy Water, Pioneer Venus Spacecraft, Spectral Resolution, Venus, Deuterium, Earth-Based Observations, Absorption, Water, Spectra, Atmosphere, Altitude, Isotopic Ratios, Comparisons, Hypotheses, Comets, Spacecraft Observations, Satellite Observations, Procedure, Abundance, Enrichment, Escape, Bombardment

Scientific paper

Absorption lines of HDO and H2O have been detected in a 0.23-wave number resolution spectrum of the dark side of Venus in the interval 2.34 to 2.43 microns, where the atmosphere is sounded in the altitude range from 32 to 42 kilometers (8 to 3 bars). The resulting value of the D/H ratio is 120 + or - 40 times the telluric ratio, providing unequivocal confirmation of in situ Pioneer Venus mass spectrometer measurements that were in apparent conflict with an upper limit set from International UIltraviolet Explorer spectra. The 100-fold enrichment of the D/H ratio on Venus compared to earth is thus a fundamental constraint on models for its atmospheric evolution.

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