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Fig. 3


Biennal mean surface temperatures of completely dry atmospheres, for 2 orbital configurations (synchronous and 3:2 orbital resonance) and 4 atmospheric compositions and pressures (6 bars of pure CO2, 4 bars of pure CO2, 1 bar of pure CO2 and 1 bar of N2 + 376 ppm of CO2 – Earth-like atmosphere). The solid black line contour corresponds to the 273.15 K isotherm; the dashed blue line contour indicates the regions where the atmospheric CO2 collapses permanently into CO2 ice deposits. The 1 bar pure CO2 (synchronous) simulation is not stable in the long term since CO2 would collapse at the two cold points.

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