Climatic consequences of very high carbon dioxide levels in the earth's early atmosphere

Details Climatic consequences of very high carbon dioxide levels in the earth's early atmosphere Climatic consequences of very high carbon dioxide levels in the earth's early atmosphere

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...234.1383k&link_type=abstract

Science (ISSN 0036-8075), vol. 234, Dec. 12, 1986, p. 1383-1385.

Computer Science

96

Atmospheric Composition, Carbon Dioxide, Climatology, Primitive Earth Atmosphere, Atmospheric Correction, Atmospheric Models, Stability, Surface Temperature

Scientific paper

The possible consequences of very high carbon dioxide concentrations in the earth's early atmosphere have been investigated with a radiative-convective climate model. The early atmosphere would apparently have been stable against the onset of a runaway greenhouse (that is, the complete evaporation of the oceans) for carbon dioxide pressures up to at least 100 bars. A 10- to 20-bar carbon dioxide atmosphere, such as may have existed during the first several hundred million years of the earth's history, would have had a surface temperature of approximately 85 to 110 C. The early stratosphere should have been dry, thereby precluding the possibility of an oxygenic prebiotic atmosphere caused by photodissociation of water vapor followed by escape of hydrogen to space. Earth's present atmosphere also appears to be stable against a carbon dioxide-induced runaway greenhouse.

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