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Runaway and moist greenhouse atmospheres and the evolution of earth and VenusFor the case of fully moisture-saturated and cloud-free conditions, the present one-dimensional climate model for the response of an earthlike atmosphere to large solar flux increases notes the critical solar flux at which runaway greenhouse (total evaporation of oceans) occurs to be 1.4 times the present flux at the earth's orbit, almost independently of the CO2 content of the atmophere. The value is, however, sensitive to the H2O absorption coefficient in the 8-12 micron window. Venus oceans may have been lost early on due to rapid water vapor photodissociation, followed by hydrogen escape into space.
Document ID
19880055273
Document Type
Reprint (Version printed in journal)
Authors
Kasting, James F.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1988
Publication Information
Publication: Icarus
Volume: 74
ISSN: 0019-1035
Subject Category
Lunar And Planetary Exploration
Distribution Limits
Public
Copyright
Other
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