Table 1. Global CH4 emissions diagnosed (wetlands and OH and stratospheric loss) or else prescribed within HadGEM2-ES climate-chemistry simulations.
PI |
LGM |
|||
---|---|---|---|---|
Control | Low-fire | Standard | Standard+LGM humans | |
Sources (TgCH4yr−1) | ||||
Wetlands | 138.2 | 96.8 | 96.8 | 96.8 |
Wetlands+peatlands | 138.2 | 80.5 | 80.5 | 80.5 |
Biomass burning | 14.0 | 1.4 | 9.2 | 11.6 |
Oceans | 15.0 | 12.1 | 12.1 | 12.1 |
Termites | 20.0 | 11.6 | 11.6 | 11.6 |
Hydrates | 10.0 | 0 | 0 | 0 |
SUM | 197.2 | 121.9 | 129.7 | 132.1 |
Sinks (TgCH4yr−1) | ||||
Tropospheric OH loss | 160 | 102 | — | — |
Soil uptake | 11 | 6 | — | — |
Added stratospheric loss | 21 | 12 | — | — |
Atmospheric loss terms are diagnosed within the low-fire emissions-driven simulation for consistency with the emissions listed. The LGM sum excludes the treatment of peatlands and is reduced by 16.3TgCH4yr−1 when they are considered.