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Table 1
Parameter values for the carbon cycle model.
| Parameter | Description | Value |
|---|---|---|
| A | Decarbonation constant | 3.125 × 10−3 K (4) |
| B | Decarbonation constant | 8.355 × 102 K m−1 (4) |
| α | Seafloor-weathering constant | 0.23 (1) |
| PCO_2,E | Present-day Earth atmospheric CO2 partial pressure | 4 × 10−10 bar |
| agrad | Constant for calculating the pore-space temperature | 1.02 (2) |
| bint | Constant for calculating the pore-space temperature | −16.7 (2) |
| Ebas | Activation energy for seafloor weathering | 9.2 × 104 J mol−1 (2) |
| Fsfw,E | Present-day Earth seafloor weathering rate | 1.75 × 1012 mol yr−1 (2) |
| ξE | Seafloor-weathering fraction of the total present-day weathering rate | 0.15 (1) |
| fE | Present-day Earth fraction of carbon that is not removed by arc volcanism during subduction | 0.5 |
 |
Present-day Earth fraction of carbon in the crust | 0.1 (3) |
| Rtot,E | Present-day Earth mantle carbon reservoir | 2.5 × 1022 mol (3) |
| ω | Relative release of the volatile CO2 reservoir in the crustal matrix to the atmosphere per time step | 0.02 |
References. (1) Foley (2015), (2) Krissansen-Totton & Catling (2017), (3)Sleep & Zahnle (2001), (4)Foley & Smye (2018).
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