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The Methane Diurnal Variation and Microseepage Flux at Gale Crater, Mars as Constrained by the ExoMars Trace Gas Orbiter and Curiosity Observations

Moores, John; King, Penelope; Smith, Christina L.; Martinez, German M.; Newman, Claire E.; Guzewich, Scott D.; Meslin, Pierre‐Yves; Webster, Christopher R.; Mahaffy, Paul R.; Atreya, Sushil K.; Schuerger, Andrew C.


The upper bound of 50 parts per trillion by volume for Mars methane above 5 km established by the ExoMars Trace Gas Orbiter, substantially lower than the 410 parts per trillion by volume average measured overnight by the Curiosity Rover, places a strong constraint on the daytime methane flux at the Gale crater. We propose that these measurements may be largely reconciled by the inhibition of mixing near the surface overnight, whereby methane emitted from the subsurface accumulates within...[Show more]

CollectionsANU Research Publications
Date published: 2019-08-26
Type: Journal article
Source: Geophysical Research Letters
DOI: 10.1029/2019GL083800
Access Rights: Open Access


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