Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.359..226c&link_type=abstract
Nature (ISSN 0028-0836), vol. 359, no. 6392, p. 226-228.
Physics
65
Carbon Dioxide, Earth Radiation Budget, Geotemperature, Greenhouse Effect, Ice Environments, Paleoclimatology, Primitive Earth Atmosphere, Atmospheric Heat Budget, Carbon Dioxide Concentration, Feedback, Glaciers, Solar Flux
Scientific paper
Solar fluxes 25-30 percent lower than today early in the earth's history apparently did not lead to runaway glaciation on earth. A currently favored explanation for this is that high partial pressures of CO2 created a large enough greenhouse effect to keep the planet warm. This does not resolve the problem of climate stability, however, because the ocean can freeze much more quickly than CO2 can accumulate in the atmosphere. Had such a transient global occurred in the distant past when solar luminosity was low, it might have been irreversible because of the formation of highly reflective CO2 clouds. A simulation of the early earth is reported which incorporates the possible formation of such clouds. The results suggest that the earth might not be habitable today had it not been warm during the first part of its history.
Caldeira Ken
Kasting James F.
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