Glacial wetland distribution and methane emissions estimated from PMIP2 climate simulations

Figures & data

Figure 1. Annual methane emissions for the PIH (upper graph), the glacial changes (LGM minus PIH; second graph), emissions from PIH wetlands that were covered by ice during the LGM (third graph) and from LGM wetlands on continental shelves that were inundated during the PIH (lower graph) for eight different models. Emissions are integrated zonally and by 10° latitude belts.

Table 1. The PIH and LGM simulations included in the analysis, their type (atmosphere-ocean or atmosphere-ocean-vegetation), and the annual methane emissions from wetlands (in Tg) during the PIH and the LGM estimated from each model.

		PIH			LGM
Model	Type	Total	90–30N	30N–30S	Total	90–30N	30N–30S
HadCM3M2	AO	151	41	111	89	17	73
HadCM3M2-TRIFFID	AOV	145	41	105	85	15	70
CCSM3.0	AO	149	31	119	105	16	90
MIROC3.2.2	AO	150	37	116	87	15	74
ECHAM-MPIOM127	AO	146	21	127	93	8	86
ECHAM-MPIOM127-LPJ	AOV	147	21	128	91	10	82
IPSL-CM4-V1-MR	AO	150	47	104	97	17	81
CNRM-CM33	AO	148	31	119	92	12	81
Global emissions, NH extratropical and tropical values are shown.

Figure 2. The mean temperature during the emission season, latitudinally averaged over latitudes 30–90° N, for the PIH (solid lines) and the LGM (dashed lines) in four PMIP2 simulations: CCSM3.0 (red: offset by −5°C), HadCMsM2 (black), HadCM3M2-TRIFFID (blue) and MIROC3.2.2 (green, offset by + 8°C).