Table 8.
Lower Limit of Uncertainty (±2σ) Entering the Global Air-Temperature Record.
| Land Surface | Sea Surface | ||
|---|---|---|---|
| Instrumental | Instrumental (LiG; 1 °C/division) a | ||
| accuracy (LiG; 1 °C/division) a | 0.30 | accuracy | 0.30 |
| visual repeatability (LiG; 1 °C/division) a | 0.144 | visual repeatability | 0.144 |
| non-linearity (LiG; 1 °C/division) a | 0.371 | non-linearity | 0.017 |
| MMTS b | 0.196 | ||
| Systematic | Systematic | ||
| Stevenson/CRS b | 0.58 | bucket | 0.30 d |
| MMTS b | 0.56 | engine-intake | 2.0 d |
| Instrumental (USCRN) c | bathythermograph | 0.30 e | |
| sensor resolution | 0.10 | ||
| self-heating f | 0.48 | ||