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Title:
Runaway and moist greenhouse atmospheres and the evolution of earth and Venus
Authors:
Kasting, J. F.
Affiliation:
AA(NASA, Ames Research Center, Moffett Field, CA)
Publication:
Icarus (ISSN 0019-1035), vol. 74, June 1988, p. 472-494. (Icarus Homepage)
Publication Date:
06/1988
Category:
Lunar and Planetary Exploration; Planets
Origin:
STI; LPI [AN-880433%J]
NASA/STI Keywords:
EARTH ATMOSPHERE, GREENHOUSE EFFECT, PLANETARY EVOLUTION, VENUS ATMOSPHERE, ATMOSPHERIC MODELS, ATMOSPHERIC MOISTURE, HUMIDITY, RADIATIVE HEAT TRANSFER, SOLAR HEATING, SURFACE TEMPERATURE
LPI Keywords:
PLANETS, EARTH, GREENHOUSE EFFECT, ATMOSPHERE, EVOLUTION, VENUS, MODELS, CLIMATE, SOLAR FLUX, CARBON DIOXIDE, WATER, ABSORPTION, THERMAL EFFECTS, TEMPERATURE, CLOUDS, PHOTODISSOCIATION, WATER VAPOR, HYDROGEN, ESCAPE, SURFACE, ACCRETION, FORMATION, COMPARISONS
DOI:
10.1016/0019-1035(88)90116-9
Bibliographic Code:
1988Icar...74..472K

Abstract

For 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.
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