Table 3
CO2 column density and mixing ratio obtained for several oxygen influx and CO+OH → CO2 + H reaction rate coefficients.
| k201 as in Table A.1 | k201 = 1.5 × 10−13 cm3 s−1 | |||
|---|---|---|---|---|
| Model | qa at 0.15 mbar | Column (cm−2) | qa at 0.15 mbar | Column (cm−2) |
| TW18 | 8.3 × 10−11 | 9.6 × 1012 | 8.8 × 10−11 | 1.0 × 1013 |
| MP17 | 6.0 × 10−11 | 6.9 × 1012 | 6.7 × 10−11 | 7.6 × 1012 |
| TW18ab | 9.4 × 10−11 | 1.1 × 1013 | ||
| TW18ab | 8.6 × 10−11 | 9.9 × 1012 | ||
Notes. TW18 and MP17 refer to models with nominal values of the oxygen-bearing influx (see Sect. 4). (a) CO2 best-fit mixing ratio at 0.15 mbar from photochemical modelling in Orton et al. (2014b) is 8.0 × 10−11. (b) Ice grain ablation influx giving rise to 1.2 × 105 and 4.5 × 103 cm−2 s−1 for H2O and CO2, respectively.
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