Table 1.

Preindustrial and Prior and Posterior LGM Methane Sources and Lifetime

		LGM
		Prior			Posterior
Sources (TgCH4/year)	Late Preindustrial	Mean	±1 s.d.	ΔLGM (%)	Mean	±1 s.d.	ΔLGM (%)
N extratropical wetland	55	18	4.7	−67	12.0	4.0	−78
Tropical wetland	73	55	14.3	−25	32.0	4.7	−56
S extratropical wetlanda	11	6.2	—	−44	—	—
Biomass burning	21	13.5	4.8	−36	16.6	2.0	−21
Termites	20	12	3.1	−40	10.8	3.0	−46
Hydrates	10	10	3.6	0	6.9	2.2	−31
Other geological	10	10	4.6	0	10.5	2.5	5
Oceansa	1	0.8	−	−20	−	−	−
Sum	201	126	34	−38	96	18	−52
Total lifetime (yr)	9.7	10.3b	0.2	6	10.4c	0.1	7

Note. The LGM means and standard deviations are derived from the PDFs shown in the blue curves in Figure 3. The individual prior sink terms are given in Table S4 in the supporting information. Refer to Tables S2 and S3 for isotopic signatures of individual sources and sinks.

^aIndicates sources not varied as part of the Bayesian algorithm.

^bCalculated using the prior mean LGM fire emissions.

^cCalculated using the posterior mean LGM fire emissions. LGM = Last Glacial Maximum.