Other
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238.1465y&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, June 15, 1989, p. 1465-1478.
Other
10
Cretaceous-Tertiary Boundary, Earth Surface, Extinction, Interstellar Matter, Molecular Clouds, Solar System, Dust, Environment Effects, Hydrogen Clouds, Interstellar Gas, Iridium
Scientific paper
Discussion is made of the accretion of interstellar hydrogen and dust on to the earth during the passage of the solar system through a giant molecular cloud. For cloud densities above 1000-10,000/cu cm hydrogen remains neutral down to 1 AU and can be captured (along with dust) by the earth's atmosphere, while for densities above about 10,000/cu cm the hydrogen reacts to form water in the atmosphere before it can re-evaporate. The dust suspended in the upper atmosphere can reduce the global temperature, while water vapor from accreted hydrogen will condense as snow on the grains, increasing this effect. It is suggested that the K/T boundary was an extreme event due to the passage of the solar system through the core of a giant molecular cloud, and may thus have been qualitatively different from other extinction boundaries, as evidenced by the anomolous Ir deposits.
Allen Anthony J.
Yabushita Shin
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