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Table 3

Area-scale ERs determined from aircraft measurements. Area-scale ERs for the western half determined using aircraft data for each flight for which analysis was possible. DOI: https://doi.org/10.1525/elementa.351.t3

DateTime window of measurements (local time)Altitude range (meters above ground level)CH4 range (ppb)C2H6 range (ppb)R2 range and number of legsMean C2H6 to CH4 ER (in situ)

 
9/22/2015 3:56 PM–4:12 PM 403–735 1910–2050 1.3–3.7 R2 = 0.69 for 1 leg 1.2 ± 0.03% 
10/2/2015 12:47 PM–1:13 PM 244–460 1940–2080 1.2–2.9 R2 = 0.64 for 1 leg 1.1 ± 0.04% 
10/5/2015 12:09 PM–2:05 PM 157–444 1999–2337 2.3–8.4 R2 from 0.67 to 0.91 for 7 legs 1.2 ± 0.03% 
10/6/2015 11:04 AM–12:09 PM 198–466 1990–2236 2.3–5.7 R2 from 0.65 to 0.91 for 4 legs 1.3 ± 0.05% 
10/7/2015 12:41 PM–3:19 PM 138–560 1939–3500 1.2–11.4 R2 from 0.67 to 0.90 for 10 legs 1.3 ± 0.04% 
DateTime window of measurements (local time)Altitude range (meters above ground level)CH4 range (ppb)C2H6 range (ppb)R2 range and number of legsMean C2H6 to CH4 ER (in situ)

 
9/22/2015 3:56 PM–4:12 PM 403–735 1910–2050 1.3–3.7 R2 = 0.69 for 1 leg 1.2 ± 0.03% 
10/2/2015 12:47 PM–1:13 PM 244–460 1940–2080 1.2–2.9 R2 = 0.64 for 1 leg 1.1 ± 0.04% 
10/5/2015 12:09 PM–2:05 PM 157–444 1999–2337 2.3–8.4 R2 from 0.67 to 0.91 for 7 legs 1.2 ± 0.03% 
10/6/2015 11:04 AM–12:09 PM 198–466 1990–2236 2.3–5.7 R2 from 0.65 to 0.91 for 4 legs 1.3 ± 0.05% 
10/7/2015 12:41 PM–3:19 PM 138–560 1939–3500 1.2–11.4 R2 from 0.67 to 0.90 for 10 legs 1.3 ± 0.04% 
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