Day-night differences in Mars methane suggest nighttime containment at Gale crater

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Table 1

Mars methane spikes reported since the Curiosi ty landing in 2012.

Instrument	Platform	Date of spike	LS (deg)^(a)	CH₄ mixing ratio ppbv ±1 sem	Reference
PFS on Mars Express	Orbiter	Jun. 16 2013	336.12	15.5 ± 2.5	Giuranna et al. (2019)

TLS-SAM on Curiosity	Mars rover	Jun. 16 2013	336.12	5.8 ± 2.3	Webster et al. (2015)

TLS-SAM on Curiosity	Mars rover	Nov. 29 2013– Jan. 28 2014	55.5–81.4	7.2 ± 0.8	Webster et al. (2015)

TLS-SAM on Curiosity	Mars rover	Nov. 22 2016	265.9	5.5 ± 2.1	Webster et al. (2018)

TLS-SAM on Curiosity	Mars rover	Jun. 19 2019	41.5	20.5 ± 2	This paper, in situ value

iSHELL at NASA IRTF	Earth telescope	Jan. 2/9 2017 Jan. 29/31 2018	293 (2017) 122 (2018)	25 ± 1	Novak et al. (2019)

Notes. ^(a) Corresponding to the northern hemisphere (spring equinox at LS 0°); Curiosity landing site (4.6°S, 137.4°E) is just south of the equator.

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