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Science 14 November 1997:
Vol. 278. no. 5341, pp. 1273 - 1276
DOI: 10.1126/science.278.5341.1273
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Reports

Warming Early Mars with Carbon Dioxide Clouds That Scatter Infrared Radiation

François Forget, Raymond T. Pierrehumbert

Geomorphic evidence that Mars was warm enough to support flowing water about 3.8 billion years ago presents a continuing enigma that cannot be explained by conventional greenhouse warming mechanisms. Model calculations show that the surface of early Mars could have been warmed through a scattering variant of the greenhouse effect, resulting from the ability of the carbon dioxide ice clouds to reflect the outgoing thermal radiation back to the surface. This process could also explain how Earth avoided an early irreversible glaciation and could extend the size of the habitable zone on extrasolar planets around stars.

F. Forget, Laboratoire de Météorologie Dynamique du CNRS, Université Pierre et Marie Curie, Boite Postale 99, 4 place Jussieu, 75252 Paris Cedex 05, France. E-mail: forget{at}lmd.jussieu.fr
R. T. Pierrehumbert, Department of Geophysical Sciences, University of Chicago, Chicago, IL, USA.

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