Fig. 6: Trends in oil production and emissions over the Permian Basin.
From: Space-based observations of tropospheric ethane map emissions from fossil fuel extraction
Annual mean ethane emission estimates are plotted in gold on the left axis, while annual oil production rates for the same region68 are plotted in purple on the right axis. The Barkley et al.66 flux estimate was derived from airborne ethane measurements; the Francoeur et al.67 estimate is a bottom-up estimate of ethane emissions; the GEOS-Chem ethane emissions are from Tzompa-Sosa et al.3; and the Varon et al.65 and Zhang et al.46 values were obtained by applying a basin-average ethane:methane emission ratio of 18%3,66,69 to their satellite-derived methane flux estimates. The Cross-track Infrared Sounder (CrIS) ethane emissions in this plot were derived using the same methodology as shown in Fig. 5.
