Evolution of a steam atmosphere during earth's accretion

Details Evolution of a steam atmosphere during earth's accretion Evolution of a steam atmosphere during earth's accretion

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988icar...74...62z&link_type=abstract

(Conference on the Origin and Evolution of Planetary and Satellite Atmospheres, Tucson, AZ, Mar. 10-14, 1987) Icarus (ISSN 0019-

Computer Science

71

Outgassing, Planetary Evolution, Primitive Earth Atmosphere, Protoplanets, Steam, Atmospheric Models, Earth Core, Extreme Ultraviolet Radiation, Greenhouse Effect, Earth, Evolution, Atmosphere, Accretion, Formation, Models, Parameters, Planetesimals, Water, Outgassing, Temperature, Hydrogen, Escape, Mixing, Impacts, Greenhouse Effect, Calculations, Interior, Radial Transport, Thermal Effects, Solubility, Energy, Partitioning, Ultraviolet, Erosion, Rehydration, Silicates, Homogeneity, Parameters

Scientific paper

The evolution of an impact-generated steam atmosphere around an accreting earth is presently modeled under the assumption of Safronov (1978) accretion, in a scheme that encompasses the degassing of planetesimals on impact, thermal blanketing by the steam atmosphere, surface-to-interior water exchange, the shock heating and convective cooling of the earth's interior, and hydrogen escape due both to solar EUV-powered planetary wind and impact erosion. The model yields four distinct classes of impact-generated atmospheres: the first, on which emphasis is placed, has as its salient feature a molten surface that is maintained by the opacity of a massive water vapor atmosphere; the second occurs when the EUV-limited escape exceeds the impact degassing rate, while the third is dominated by impact erosion and the fourth is characterized by an atmosphere more massive than any thus far encountered.

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