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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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