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Table 3
Results for the methane mole fractions from previous studies and inferred from the PACS observations.
| Data source | Mole fraction | Sensitivity range | References |
|---|---|---|---|
| Voyager/IRIS | (1.69 ± 0.19) × 10−3 | ‘Upper troposphere’ | Gautier et al. (1982) |
| KPNO/FTS | (2.16 ± 0.34) × 10−3 | p ~ (1.0–1.8) bar | Knacke et al. (1982) |
| KAO | (3.0 ± 1.0) × 10−3 | p ~ (1–6) bar | Bjoraker et al. (1986) |
| Galileo/GPMS | (1.81 ± 0.34) × 10−3 | p ~ (0.5–3.8) bar | Niemann et al. (1998) |
| Galileo/GPMS | (2.04 ± 0.49) × 10−3 | p ~ (0.5–3.8) bar | Wong et al. (2004) |
| Herschel/PACS | (1.49 ± 0.09) × 10−3 | p ~ (0.35–0.8) bar | This study |
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