Mechanisms and observations for isotope fractionation of molecular species in planetary atmospheres

Details Mechanisms and observations for isotope fractionation of molecular species in planetary atmospheres Mechanisms and observations for isotope fractionation of molecular species in planetary atmospheres

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987rvgeo..25.1609k&link_type=abstract

Reviews of Geophysics (ISSN 8755-1209), vol. 25, Nov. 1987, p. 1609-1658.

Physics

70

Earth Atmosphere, Fractionation, Isotopic Enrichment, Molecular Gases, Planetary Atmospheres, Atmospheric Chemistry, Atmospheric Physics, Atmospheric Temperature, Reaction Kinetics, Planets, Atmosphere, Isotopes, Fractionation, Molecules, Abundance, Mass, Escape, Thermal Properties, Equilibrium, Phases, Photolysis, Chemistry, Reactions, Earth, Comparisons, Carbon, Nitrogen, Sulfur, Oxygen, Hydrogen, Radiogenic Elements, Venus, Mars, Giant Planets, Satellites, Production Rate, Jupiter, Saturn, Uranus, Titan,

Scientific paper

Chemcial and physical processes which may give rise to isotope fractionation of molecular species in the atmospheres of both earth and other planets are reviewed, along with observations of isotopically substituted molecules in planetary atmospheres. Mechanisms for production of isotope fractionation considered include atmospheric escape and the effect of isotope substitution on equilibrium constants (including those of phase changes), photolysis rates, and chemical reaction rates. The isotopes considered for compounds in the terrestrial atmosphere include D, T, C-13, C-14, N-15, O-18, and S-34. Compounds for which data about isotopic composition in the terrestrial atmosphere are summarized include CO, CO2, O3, N2O, NH3, SO2, H2S, H2O, H, H2, and CH4. Planetary atmospheres discussed include those of Venus, Mars, Jupiter, Saturn, Uranus, and Titan; isotopes reviewed are D, C-13, N-15, and O-18. Suggestions for additional research in the area of isotopically substituted molecules in atmospheres are offered.

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