Table 1.
CH4 emissions from various models
| Lead author | Model | Emissions, Tg | Averaging period | Ref(s). |
| Land surface models | ||||
| Melton | DLEM | 0.8 ± 0.2 | 1993–2004 | (49) |
| Melton | LPJ-Bern | 1.2 ± 0.3 | 1993–2004 | (49) |
| Melton | LPJ-WHyMe | 6 ± 1 | 1993–2004 | (49) |
| Melton | LPJ-WSL | 0.9 ± 0.2 | 1993–2004 | (49) |
| Melton | ORCHIDEE | 1.0 ± 0.4 | 1993–2004 | (49) |
| Melton | SDGVM | 0.7 ± 0.2 | 1993–2004 | (49) |
| Riley | CLM4Me | 5 ± 2 | 2001–2010 | (50) |
| Zhu | 2.6 ± 0.1 | 2000–2009 | (51) | |
| Zhuang | TEM | 3 (annual) | 1980–1996 | (32) |
| Matthews | 4.34 | (52) | ||
| Inverse models | ||||
| Bergamaschi | TM5-4DVAR | 1.3 ± 0.3 | 2001–2010 | (15) |
| Bruhwiler | CT-CH4 | 1.5 ± 0.2 | 2000–2009 | (16) |
| Chen | MATCH | 2 ± 1 | 1996–2001 | (17) |
| This study | 2.1 ± 0.5 | 2012 | ||
Emissions were calculated for the region 55–75° N, 141–169° W for May to September of the given years, except TEM, where the given value is the annual emission for all of Alaska. CLM4Me, community land model with CH4 biogeochemistry; CT-CH4, CarbonTracker-CH4; DLEM, dynamic land surface ecosystem model; LPJ, Lund–Potsdam–Jena dynamic global vegetation model; MATCH, model for atmospheric transport and chemistry; ORCHIDEE, organizing carbon and hydrology in dynamic ecosystems; SDGVM, Sheffield dynamic global vegetation model; TEM, terrestrial ecosystem model; TM5-4DVAR, tracer model V5-4-dimensional variational inverse modeling system; WHyMe, wetland hydrology and methane; WSL, Swiss Federal Institute for Forest, Snow and Landscape Research.