Table 1. Downward reevaluation of tropical lacustrine CO2, CH4, and N2O emissions.
Air-water flux of CO2 (FCO2), CH4 (FCH4, diffusive and ebullitive), and N2O (FN2O) integrated for African tropical and pan-tropical lakes (with a surface area >0.1 km2) compared to previous estimates (details in table S4) (1, 3, 4, 9, 31, 47). Values with a single asterisk (*) correspond to the scaling using the original HydroLAKES surface area (29), including an unrealistic surface area value of 18,752 km2 for Lake Chad. Values with a double asterisk (**) were obtained with a more recent surface area value of 2603 km2 for Lake Chad (30). n.a., not available.
| FCO2 | Diffusive FCH4 | Ebullitive FCH4 | FN2O | ||
| TgC year–1 | TgCH4 year–1 | TgCH4 year–1 | GgN2O-N year–1 | ||
| African tropical lakes | |||||
| This study (*) | 6.3 ± 1.9 | 1.3 ± 0.3 | 2.3 (0.8–5.5) | 0.3 ± 0.2 | |
| This study (**) | 3.3 ± 1.0 | 0.4 ± 0.1 | 1.8 (0.6–4.1) | −0.1 ± 0.1 | |
| Previous studies | 35.6 | n.a. | n.a. | 3.7 | |
| Pan-tropical lakes | |||||
| This study (*) | 20.5 ± 10.7 | 1.6 ± 0.4 | 4.9 (1.7–11.4) | 0.8 ± 1.1 | |
| This study (**) | 17.5 ± 9.5 | 0.7 ± 0.2 | 4.4 (1.5–10.0) | 0.4 ± 0.7 | |
| Previous studies | 103.1 to 441.6 | 3.1 | 22.2 | 6.5 | |