Mars methane detection and variability at Gale crater

MSL Science Team

Research output: Contribution to journalArticle

183 Citations (Scopus)

Abstract

Reports of plumes or patches of methane in the martian atmosphere that vary over monthly time scales have defied explanation to date. From in situ measurements made over a 20-month period by the tunable laser spectrometer of the Sample Analysis at Mars instrument suite on Curiosity at Gale crater, we report detection of background levels of atmospheric methane of mean value 0.69 ± 0.25 parts per billion by volume (ppbv) at the 95% confidence interval (CI). This abundance is lower than model estimates of ultraviolet degradation of accreted interplanetary dust particles or carbonaceous chondrite material. Additionally, in four sequential measurements spanning a 60-sol period (where 1 sol is a martian day), we observed elevated levels of methane of 7.2 ± 2.1 ppbv (95% CI), implying that Mars is episodically producing methane from an additional unknown source.

Original languageEnglish
Pages (from-to)415-417
Number of pages3
JournalScience
Volume347
Issue number6220
DOIs
Publication statusPublished - Jan 23 2015
Externally publishedYes

Fingerprint

crater
Mars
methane
confidence interval
interplanetary dust
Martian atmosphere
carbonaceous chondrite
background level
in situ measurement
spectrometer
plume
laser
timescale
degradation
detection

ASJC Scopus subject areas

  • General

Cite this

Mars methane detection and variability at Gale crater. / MSL Science Team.

In: Science, Vol. 347, No. 6220, 23.01.2015, p. 415-417.

Research output: Contribution to journalArticle

MSL Science Team. / Mars methane detection and variability at Gale crater. In: Science. 2015 ; Vol. 347, No. 6220. pp. 415-417.
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