Stringent upper limit of CH4 on Mars based on SOFIA/EXES observations

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Table 3

CH₄ mixing ratio on Mars retrieved from the SOFIA/EXES observation.

Slit position	Lat (^∘)	Lon¹(^∘)	LT²	CH₄ volume mixing ratio (3σ)
				1327.0742 cm⁻¹	1327.4098 cm⁻¹	1332.5467 cm⁻¹	Weighted average
Mars Center ♯1	− 17	181	16	4 ± 8 ppb	1 ± 4 ppb	0 ± 18 ppb	2 ± 3 ppb
Mars Center ♯1	13	211	14	0 ± 2 ppb	1 ± 2 ppb	4 ± 6 ppb	1 ± 1 ppb
Mars Center ♯1	40	247	12	1 ± 3 ppb	1 ± 5 ppb	0 ± 5 ppb	1 ± 2 ppb
Mars Left	− 42	205	15	2 ± 8 ppb	0 ± 6 ppb	0 ± 14 ppb	1 ± 5 ppb
Mars Left	− 8	237	13	0 ± 6 ppb	0 ± 3 ppb	2 ± 12 ppb	0 ± 3 ppb
Mars Left	13	270	11	2 ± 4 ppb	0 ± 2 ppb	3 ± 9 ppb	1 ± 2 ppb
Mars Right	0	168	18	10 ± 16 ppb	1 ± 7 ppb	0 ± 25 ppb	3 ± 6 ppb
Mars Right	30	189	16	0 ± 2 ppb	1 ± 6 ppb	2 ± 7 ppb	0 ± 2 ppb
Mars Right	66	218	14	0 ± 2 ppb	0 ± 3 ppb	1 ± 3 ppb	0 ± 1 ppb
Mars Center ♯2	− 17	188	16	3 ± 7 ppb	0 ± 7 ppb	0 ± 11 ppb	1 ± 4 ppb
Mars Center ♯2	13	217	14	0 ± 3 ppb	0 ± 2 ppb	2 ± 5 ppb	0 ± 1 ppb
Mars Center ♯2	40	253	12	0 ± 2 ppb	3 ± 6 ppb	0 ± 4 ppb	0 ± 2 ppb

Notes. We note that EXES spectra were spatially binned over ~2.7 arcsec, which corresponds latitudinal/East-longitudinal resolution of about ±27^∘ at the sub-Earth point. ⁽¹⁾ West longitude; ⁽²⁾ Local solar time on Mars, with the LT units being 1/24th of a sol; 15 degrees of longitude.

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