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Table 10.

Summary statistics for CH4 BU emissions, PBL CH4 enhancements, and CH4 loss rates for the SJB. DOI: https://doi.org/10.1525/elementa.038.t10

CategoriesSJB CH4 Attribution
ColoradoNew Mexico
Bottom-UpSA MooneyNOAA P-3Bottom-UpSA MooneyNOAA P-3
Fraction of basin CH4 TIE (%) 38.8 26.5 27.2 61.2 73.5 72.8 
Fraction of CO or NM CH4 emissions or TIE attributed to (%) 
NG + CBMa 32.9 69.3 91.5 83.8 65.5 73.3 
Oil – – – 2.6 6.1 8.5 
Underground coal mine – – – 11.3 1.5 
Total for fossil fuel systems 32.9 69.3 91.5 97.7 73.6 83.3 
Weighted average NG + CBM C2H6-to-CH4 slopea (%) – 2.3 2.7 – 4.6 4.4 
Mean (low–high) CH4 emissions attributable to NG+CBM systemsa,b (tonnes/h) 7.6 11.3 (6.5 to 17.6) 15.3 (8.8 to 23.9) 30.5 29.7 (17 to 46.2) 32.9 (18.9 to 51.2) 
Mean NG + CBM system CH4 loss rateb,c (emissions/production in %) (low–high) 1.0 to 1.1 1.6 to 1.7 (0.9 to 2.7) 2.2 to 2.4 (1.4 to 3.8) 2.2 to 2.4 2.0 to 2.1 (1.1 to 3.4) 2.2 to 2.4 (1.3 to 3.8) 
CategoriesSJB CH4 Attribution
ColoradoNew Mexico
Bottom-UpSA MooneyNOAA P-3Bottom-UpSA MooneyNOAA P-3
Fraction of basin CH4 TIE (%) 38.8 26.5 27.2 61.2 73.5 72.8 
Fraction of CO or NM CH4 emissions or TIE attributed to (%) 
NG + CBMa 32.9 69.3 91.5 83.8 65.5 73.3 
Oil – – – 2.6 6.1 8.5 
Underground coal mine – – – 11.3 1.5 
Total for fossil fuel systems 32.9 69.3 91.5 97.7 73.6 83.3 
Weighted average NG + CBM C2H6-to-CH4 slopea (%) – 2.3 2.7 – 4.6 4.4 
Mean (low–high) CH4 emissions attributable to NG+CBM systemsa,b (tonnes/h) 7.6 11.3 (6.5 to 17.6) 15.3 (8.8 to 23.9) 30.5 29.7 (17 to 46.2) 32.9 (18.9 to 51.2) 
Mean NG + CBM system CH4 loss rateb,c (emissions/production in %) (low–high) 1.0 to 1.1 1.6 to 1.7 (0.9 to 2.7) 2.2 to 2.4 (1.4 to 3.8) 2.2 to 2.4 2.0 to 2.1 (1.1 to 3.4) 2.2 to 2.4 (1.3 to 3.8) 

aOnly plumes with 0.16% < C2H6-to-CH4 slope < 10%.

bRemoving the San Juan coal mine contributions.

cAssuming produced NG is 90% or 99% CH4 and using low/high CH4 emission scenario.

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