Mass fractionation in hydrodynamic escape

Details Mass fractionation in hydrodynamic escape Mass fractionation in hydrodynamic escape

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...69..532h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 69, March 1987, p. 532-549.

Computer Science

111

Atomic Weights, Flow Velocity, Fractionation, Hydrogen, Mars Atmosphere, Outgassing, Earth Atmosphere, Xenon Isotopes, Planets, Mass, Fractionation, Hydrodynamics, Escape, Gases, Atmosphere, Terrestrial Planets, Mars, Rare Gases, Earth, Hydrogen, Xenon, Isotopes, Flux, Calculations, Time Scale, Moon, Planetesimals, Carbon Dioxide, Nitrogen, Radiogenic Elements, Models, Comparisons, Deuterium, Helium

Scientific paper

The authors show that mass fractionation occurs during the course of hydrodynamic escape of gases from the atmosphere of an inner planet. Light gases escape more readily than heavy gases. The resultant fractionation as a function of mass yields a linear or concave downward plot in a graph of logarithm of remaining inventory against atomic mass. An episode of hydrodynamic escape early in the history of Mars could have resulted in the mass-dependent depletion of the noble gases observed in the Martian atmosphere, if Mars was initially hydrogen rich. Similarly, a hydrodynamic escape episode early in Earth's history could have yielded a mass-dependent fractionation of the xenon isotopes.

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