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Table 3

Summary of model scenarios by Kunze et al. (2014) of anoxic (Ax) atmospheres at different ages of the Earth (present, 2.5 and 3.5 Ga ago) used for the comparison with 1D model results.

Scenario Stellar insolation at TOA
(W/m2)
vmr CO2 (ppm) Tsurf (K) A surf
Ax 1365 367 290.35 0.12
Ax2.5 1121 367 216.05 0.75
Ax2.5CO2 1121 3670 270.45 0.29
Ax3.5CO2 1046 3670 264.45 0.34

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