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
| Sources . | Hourly Mean Emission Estimates 103kg CH4/h . | Additional Information about Estimates . | References . |
|---|---|---|---|
| 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) |
| Sources . | Hourly Mean Emission Estimates 103kg CH4/h . | Additional Information about Estimates . | References . |
|---|---|---|---|
| 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) |