Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..366v&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 366-367 (SEE N92-10728 01-91)
Physics
Geophysics
Earth Atmosphere, Heating, Hypervelocity Impact, Mathematical Models, Planetary Evolution, Vaporizing, Depletion, Ejecta, Escape Velocity, Impactors, Plumes, Vapors
Scientific paper
It was suggested that heating and/or vaporization of accreting carbonaceous-chondrite-type planetestimals could result in the release of their volatile components. Modeling of this process strongly suggests that substantial atmospheres/hydrospheres could develop this way. During most of the accretionary process, impact velocities generally differed from the escape velocity of the growing proto-planet because most of the collisions were between bodies in nearly matching orbits. Toward the end of accretion, however, collisions were rarer but more energetic, involving large planetestimals and higher impact velocities. Such impacts result in a net loss of atmosphere from a planet, and the cumulative effect impacts during the period of heavy bombardment might have dramatically depleted the original atmospheres. Models developed to study atmospheric erosion by impacts on Mars and the interaction of the vapor plume produced by KT impactor on Earth are applied to the case of the evolution of Earth's atmosphere.
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