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Fig. 4


Maximum ice thickness calculated from 4 completely dry GCM simulations made of 2 different atmospheric compositions (1 bar pure CO2 atmosphere, 1 bar N2-dominated atmosphere with 376 ppm of CO2) and 2 orbital configurations (synchronous and 3:2 resonance). The maximum ice thickness is calculated from the basal melting condition derived from the mean surface temperature from Fig. 3. The internal heat flux is assumed to be 110 mW m-2 for the synchronous orbit cases and 180 mW m-2 for the asynchronous cases. The global equivalent thickness of ice is 940 m (1 bar of CO2) and 1650 m (Earth atmosphere) for the synchronous rotation, and 115 m and 490 m for the 3:2 resonance, respectively. The amount of ice calculated from the 1 bar CO2 simulation is probably a lower estimate since CO2 would collapse, making the cold points even colder.

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