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Table 1.

Summary of bottom-up (BU) and top-down (TD) CH4 emission estimates for the San Juan Basin. DOI: https://doi.org/10.1525/elementa.038.t1

SourcesHourly Mean Emission Estimates 103kg CH4/hAdditional Information about EstimatesReferences
BU oil, natural gas + CBM and coal industries 43.8, 87% from NG systems and 11% from coal mining 2012 hourly mean EPA GHGI and Maasakkers et al. (2016) (larger SJB: 36.5 to 37.5°N and 106.5 to 109°W) 
BU reporting oil, natural gas, CBM companies 22.2 2015 hourly mean EPA GHGRP, 2018  
BU oil, natural gas + CBM industries 42.6 for entire basin, 43% from pneumatic devices and pumps, 34% from dehydrators, 17% from fugitive sources at well pads 2014 baseline WESTAR/ENVIRON (Parikh et al., 2017) 
BU reporting coal mining companies 3.1 to 4.9 2011 to 2016 range EPA GHGRP (2018)  
BU reporting coal power generation plants 0.28 2015 EPA GHGRP (2018)  
BU reporting landfills 0.35 2015 EPA GHGRP (2018)  
BU cattle—enteric fermentation and manure management 0.50 1.17 2014 2012 USDA, 2014 and Johnson and Johnson, 1995 (SI Table 5), EPA GHGI and Maasakkers et al. (2016)  
BU gas seepage 14.5 13.5 2016 2015 LTE, 2017 flux calculation based on COGCC 4 M Project flux mapping results for 2015 and 2016 in La Plata county, CO 
Total BU anthropogenic only 45.8 2012 EPA GHGI and Maasakkers et al. (2016) (no seepage) 
Total BU anthropogenic + gas seepage ∼60 Best available Based on estimates above 
Total TD 67.4 (50 to 77, 2σ) 61.6 (39 to 85, 1σ) 2003 to 2009 mean April 2015 Kort et al. (2014),Smith et al. (2017) (5 flights) 
TD for San Juan Coal mine 1.5 ± 1.5 tonnes/h April 2015 SI Section 2.4 
TD for 245 point sources 26 to 44 One week in April 2015 Frankenberg et al. (2016; five flights) 
SourcesHourly Mean Emission Estimates 103kg CH4/hAdditional Information about EstimatesReferences
BU oil, natural gas + CBM and coal industries 43.8, 87% from NG systems and 11% from coal mining 2012 hourly mean EPA GHGI and Maasakkers et al. (2016) (larger SJB: 36.5 to 37.5°N and 106.5 to 109°W) 
BU reporting oil, natural gas, CBM companies 22.2 2015 hourly mean EPA GHGRP, 2018  
BU oil, natural gas + CBM industries 42.6 for entire basin, 43% from pneumatic devices and pumps, 34% from dehydrators, 17% from fugitive sources at well pads 2014 baseline WESTAR/ENVIRON (Parikh et al., 2017) 
BU reporting coal mining companies 3.1 to 4.9 2011 to 2016 range EPA GHGRP (2018)  
BU reporting coal power generation plants 0.28 2015 EPA GHGRP (2018)  
BU reporting landfills 0.35 2015 EPA GHGRP (2018)  
BU cattle—enteric fermentation and manure management 0.50 1.17 2014 2012 USDA, 2014 and Johnson and Johnson, 1995 (SI Table 5), EPA GHGI and Maasakkers et al. (2016)  
BU gas seepage 14.5 13.5 2016 2015 LTE, 2017 flux calculation based on COGCC 4 M Project flux mapping results for 2015 and 2016 in La Plata county, CO 
Total BU anthropogenic only 45.8 2012 EPA GHGI and Maasakkers et al. (2016) (no seepage) 
Total BU anthropogenic + gas seepage ∼60 Best available Based on estimates above 
Total TD 67.4 (50 to 77, 2σ) 61.6 (39 to 85, 1σ) 2003 to 2009 mean April 2015 Kort et al. (2014),Smith et al. (2017) (5 flights) 
TD for San Juan Coal mine 1.5 ± 1.5 tonnes/h April 2015 SI Section 2.4 
TD for 245 point sources 26 to 44 One week in April 2015 Frankenberg et al. (2016; five flights) 
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