Runaway and moist greenhouse atmospheres and the evolution of earth and Venus

Computer Science

Scientific paper

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Earth Atmosphere, Greenhouse Effect, Planetary Evolution, Venus Atmosphere, Atmospheric Models, Atmospheric Moisture, Humidity, Radiative Heat Transfer, Solar Heating, Surface Temperature, 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

Scientific paper

This paper is an extension of previous work by Kasting and Ackerman (1986), who showed that CO2 increases alone would not trigger a runaway greenhouse. The approach taken in that study was to estimate upper limits on surface temperature at a given CO2 level. Lower limits on Ts are much more difficult to determine because of uncertainties related to relative humidity and clouds. The philosophy of this paper is similar. The goal is to estimate an upper limit on Ts at a given value of the solar flux. A second goal is to estimate the surface temperature of a runaway greenhouse atmosphere and to compare with previous predictions by Watson et al. (1984) and by Matsui and Abe (1986). Finally, the results of the model are used to speculate about when an Earth-like planet might lose its water and how much closer to the Sun Earth could have formed without ending up like Venus.

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