Global Monitoring Laboratory - Carbon Cycle Greenhouse Gases

Region

Annual Methane Emissions. The bars in these figures represent total annual methane emissions in TgCH₄/yr (teragrams of methane per year) for the selected region. The figure on the left shows posterior estimated emissions, and the figure on the right shows prior estimates from emission inventories and models of natural emissions. Microbial emissions ( blue ) are due to emissions from natural sources (mainly wetlands) and agriculture and waste. Fossil emissions ( orange ) are due to oil and gas production and transport and coal. Biomass burning ( green ) is a smaller contribution to annual methane emissions. Error bars show annual 1-σ (standard deviation) uncertainty estimates for each source category.

Date	Prior Fossil Fuel Emission	Posterior Fossil Fuel Emission	Prior Microbial Emission	Posterior Microbial Emission	Prior Pyrogenic Emission	Posterior Pyrogenic Emission	Prior Total Emission	Posterior Total Emission
1997	20.5 ± 6.98	21.71 ± 4.31	55.06 ± 10.31	47.33 ± 3.64	0.8 ± 0.61	0.8 ± 0.33	76.35 ± 12.53	69.84 ± 3.56
1998	20.77 ± 6.98	22.05 ± 4.31	63.5 ± 10.31	58.59 ± 3.64	2.08 ± 0.61	2.06 ± 0.33	86.35 ± 12.53	82.7 ± 3.56
1999	21.1 ± 6.98	19.51 ± 4.31	56.93 ± 10.31	52.93 ± 3.64	1.07 ± 0.61	1.06 ± 0.33	79.11 ± 12.53	73.5 ± 3.56
2000	21.04 ± 6.98	21.03 ± 4.31	54.43 ± 10.31	50.57 ± 3.64	0.84 ± 0.61	0.85 ± 0.33	76.31 ± 12.53	72.44 ± 3.56
2001	20.87 ± 6.98	26.87 ± 4.31	57.12 ± 10.31	48.35 ± 3.64	0.58 ± 0.61	0.58 ± 0.33	78.58 ± 12.53	75.8 ± 3.56
2002	20.71 ± 6.98	26.04 ± 4.31	57.52 ± 10.31	53.03 ± 3.64	1.71 ± 0.61	1.68 ± 0.33	79.94 ± 12.53	80.75 ± 3.56
2003	19.86 ± 6.98	25.66 ± 4.31	58.72 ± 10.31	51.83 ± 3.64	1.33 ± 0.61	1.32 ± 0.33	79.91 ± 12.53	78.81 ± 3.56
2004	19.24 ± 6.98	30.27 ± 4.31	52.18 ± 10.31	50.77 ± 3.64	1.85 ± 0.61	1.89 ± 0.33	73.27 ± 12.53	82.93 ± 3.56
2005	18.9 ± 6.98	33.98 ± 4.31	56.54 ± 10.31	56.28 ± 3.64	1.55 ± 0.61	1.55 ± 0.33	76.99 ± 12.53	91.81 ± 3.56
2006	18.36 ± 6.98	31.29 ± 4.31	57.18 ± 10.31	53.89 ± 3.64	1.2 ± 0.61	1.14 ± 0.33	76.73 ± 12.53	86.33 ± 3.56
2007	18.42 ± 6.98	29.79 ± 4.31	60.39 ± 10.31	56.6 ± 3.64	1.13 ± 0.61	1.12 ± 0.33	79.94 ± 12.53	87.51 ± 3.56
2008	18.21 ± 6.98	29.95 ± 4.31	59.96 ± 10.31	55.43 ± 3.64	0.98 ± 0.61	0.97 ± 0.33	79.15 ± 12.53	86.34 ± 3.56
2009	18.04 ± 6.98	27.79 ± 4.31	59.52 ± 10.31	59.49 ± 3.64	1.05 ± 0.61	1.08 ± 0.33	78.62 ± 12.53	88.36 ± 3.56
2010	17.64 ± 6.98	25.32 ± 4.31	60.89 ± 10.31	56.76 ± 3.64	1.52 ± 0.61	1.41 ± 0.33	80.04 ± 12.53	83.49 ± 3.56
2011	21.79 ± 6.98	33.44 ± 4.31	60.35 ± 10.31	56.98 ± 3.64	1.28 ± 0.61	1.23 ± 0.33	83.42 ± 12.53	91.65 ± 3.56
2012	21.58 ± 6.98	30.62 ± 4.31	60.06 ± 10.31	52.58 ± 3.64	1.31 ± 0.61	1.23 ± 0.33	82.94 ± 12.53	84.43 ± 3.56
2013	21.64 ± 6.98	35.02 ± 4.31	61.74 ± 10.31	53.3 ± 3.64	2.05 ± 0.61	1.87 ± 0.33	85.43 ± 12.53	90.19 ± 3.56
2014	21.61 ± 6.98	30.77 ± 4.31	64.15 ± 10.31	53.17 ± 3.64	2.23 ± 0.61	1.34 ± 0.33	87.99 ± 12.53	85.27 ± 3.56
2015	21.61 ± 6.98	28.87 ± 4.31	63.07 ± 10.31	58.65 ± 3.64	2.52 ± 0.61	1.83 ± 0.33	87.2 ± 12.53	89.35 ± 3.56
2016	21.58 ± 6.98	26.61 ± 4.31	63.98 ± 10.31	60.28 ± 3.64	1.08 ± 0.61	1.01 ± 0.33	86.64 ± 12.53	87.9 ± 3.56
2017	21.64 ± 6.98	29.33 ± 4.31	64.75 ± 10.31	59.81 ± 3.64	2.83 ± 0.61	2.09 ± 0.33	89.22 ± 12.53	91.24 ± 3.56
2018	21.61 ± 6.98	29.35 ± 4.31	66.04 ± 10.31	59.42 ± 3.64	1.73 ± 0.61	1.43 ± 0.33	89.37 ± 12.53	90.2 ± 3.56
2019	21.61 ± 6.98	30.55 ± 4.31	65.24 ± 10.31	60.17 ± 3.64	1.72 ± 0.61	1.6 ± 0.33	88.57 ± 12.53	92.32 ± 3.56
2020	21.58 ± 6.98	29.19 ± 4.31	67.81 ± 10.31	68.3 ± 3.64	1.1 ± 0.61	1.01 ± 0.33	90.49 ± 12.53	98.5 ± 3.56
2021	21.64 ± 6.98	27.27 ± 4.31	67.41 ± 10.31	68.71 ± 3.64	4.73 ± 0.61	3.14 ± 0.33	93.78 ± 12.53	99.11 ± 3.56

Tabulated Results. Annual emissions in TgCH₄/yr for the selected region, by source. "Prior" and "Posterior" refer to estimated emissions before and after assimilation of atmospheric observations. The estimated uncertainties are 1-σ confidence intervals. The columns labeled "Prior Total" and "Posterior Total" show the sums of the individual source categories.

Monthly Emissions. (Top) Total monthly methane emissions in TgCH₄/yr for the selected region. The blue curve and light blue shaded regions show estimated emissions and 1-σ uncertainty bounds after assimilation of atmospheric observations. The red curve and orange shaded regions show estimated emissions and 1-σ uncertainty bounds from inventories and models of natural emissions used as prior estimates of emissions. (Bottom Figures) Same as above except for each source category (microbial, fossil fuel and biomass burning).

Monthly Emission Anomalies. (Top) Total monthly methane emission anomalies in TgCH₄/yr for the selected region. The blue curve and light blue shaded regions show estimated emission anomalies and 1-σ uncertainty bounds after assimilation of atmospheric observations. The red curve and orange shaded regions show estimated emission anomalies and 1-σ uncertainty bounds from inventories and models of natural emissions used as prior estimates of emissions. (Bottom Figures) Same as above except for each source category (microbial, fossil fuel and biomass burning). Emission anomalies are calculate with respect monthly means over the entire period (1997-2021).

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