Table 3
Climate–chemistry scenarios: surface mixing ratio of CO2, H2, He, and CH4.
| Scenario | CO2 | H2 | He | CH4 |
|---|---|---|---|---|
| 1a | 1 × 10−9 | Fill gas | 0.2 | 1 × 10−6 |
| 1b | 1 × 10−3 | |||
| 1c | 0.03 | |||
| 2a | 1 × 10−3 | Fill gas | 0.1998 | 1 × 10−6 |
| 2b | 1 × 10−3 | |||
| 2c | 0.03 | |||
| 3a | 0.01 | Fill gas | 0.198 | 1 × 10−6 |
| 3b | 1 × 10−3 | |||
| 3c | 0.03 | |||
| 4a | 0.1 | Fill gas | 0.18 | 1 × 10−6 |
| 4b | 1 × 10−3 | |||
| 4c | 0.03 | |||
| 5a | 0.3 | Fill gas | 0.14 | 1 × 10−6 |
| 5b | 1 × 10−3 | |||
| 5c | 0.03 | |||
| 6a | Fill gas | 0.4 | 0.1 | 1 × 10−6 |
| 6b | 1 × 10−3 | |||
| 6c | 0.03 | |||
| 7a | Fill gas | 0.24 | 0.06 | 1 × 10−6 |
| 7b | 1 × 10−3 | |||
| 7c | 0.03 | |||
| 8a | Fill gas | 0.08 | 0.02 | 1 × 10−6 |
| 8b | 1 × 10−3 | |||
| 8c | 0.03 | |||
| 9a | Fill gas | 8 × 10−3 | 2 × 10−3 | 1 × 10−6 |
| 9b | 1 × 10−3 | |||
| 9c | 0.03 | |||
| 10a | Fill gas | 8 × 10−6 | 2 × 10−6 | 1 × 10−6 |
| 10b | 1 × 10−3 | |||
| 10c | 0.03 | |||
Notes. Fill gas denotes the main constituent of the atmosphere. Scenario 1c has a composition similar to Neptune: an H2 -dominated atmosphere with 20% He (Williams et al. 2004), 1 ppb CO2 (Meadows et al. 2008), and 3% CH4 (Irwin et al. 2019). Scenario 10a has a CO2-dominated atmosphere with ~10 ppm H2 and He similar to Mars and Venus (Krasnopolsky & Gladstone 2005; Krasnopolsky & Feldman 2001). For each of the ten main scenarios regarding the main composition of the atmosphere we consider three different boundary conditions of CH4 (see text).
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