The Martian paleoclimate and enhanced atmospheric carbon dioxide |
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Authors: | RD Cess V Ramanathan Tobias Owen |
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Institution: | Laboratory for Planetary Atmospheres Research, State University of New York, Stony Brook, New York 11794, USA;Laboratory for Planetary Atmospheres Research, State University of New York, Stony Brook, New York 11794, USA |
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Abstract: | Current evidence indicates that the Martian surface is abundant with water presently in the form of ice, while the atmosphere was at one time more massive with a past surface pressure of as much as 1 atm of CO2. In an attempt to understand the Martian paleoclimate, we have modeled a past CO2H2O greenhouse and find global temperatures which are consistent with an earlier presence of liquid surface water, a finding which agrees with the extensive evidence for past fluvial erosion. An important aspect of the CO2H2O greenhouse model is the detailed inclusion of CO2 hot bands. For a surface pressure of 1 atm of CO2, the present greenhouse model predicts a global mean surface temperature of 294°K, but if the hot bands are excluded, a surface temperature of only 250°K is achieved. |
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