Table 1
Reported methane mole fractions at different altitudes in Titan’s atmosphere, for similar latitude and season to those sampled by Huygens.
| CH4 (%) | σ(%) | Altitude (km) | Instrument | References |
|---|---|---|---|---|
| 1.31 | 0.01 | 981 | INMS | 1 |
| 1.75 | 0.01 | 1025 | “ | 1 |
| 1.75 | 0.01 | 1025 | “ | 1 |
| 2.2 | 0.01 | 1077 | “ | 1 |
| 3 | 0.01 | 1151 | 1 | |
| 1.32–2.42 | – | 1000–1100 | 2 | |
| 2.17 | 0.44 | 1050 | “ | 3 |
| 2.00 | 0.5 | 1200 | “ | 4 |
| >20 | 1 | 1500 | “ | 4 |
| 0.95 | 0.06 | 125–200 | CIRS | 5 |
| 1.15 | 0.05 | 250–350 | VIMS | 6 |
| 1.5 | 0.5 | 130 | “ | 6 |
| 1 | – | 110 | DISR | 7 |
| 1.4–1.5 | – | <60 | “ | 7 |
| 5.1 | 0.8 | 30 m | “ | 8 |
| 4.5 | 0.5 | 30 m | “ | 9 |
Notes. (1) Cui et al. (2009); (2) Waite et al. (2007); (3) Magee et al. (2009); (4) Coutelier et al. (2024); (5) Lellouch et al. (2014); (6) Rannou et al. (2021); (7) Rey et al. (2018); (8) Jacquemart et al. (2008); (9) Schröder & Keller (2008).
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