Mars methane detection and variability at Gale crater

MSL Science Team

Research output: Contribution to journalArticle

211 Citations (Scopus)

Abstract

Reports of plumes or patches of methane in the Martian atmosphere that vary over monthly timescales have defied explanation to date. From in situ measurements made over a 20-month period by the Tunable Laser Spectrometer (TLS) of the Sample Analysis at Mars (SAM) instrument suite on Curiosity at Gale Crater, we report detection of background levels of atmospheric methane of mean value 0.69 ± 0.25 ppbv at the 95% confidence interval (CI). This abundance is lower than model estimates of ultraviolet (UV) degradation of accreted interplanetary dust particles (IDP’s) or carbonaceous chondrite material. Additionally, in four sequential measurements spanning a 60-sol period, we observed elevated levels of methane of 7.2 ± 2.1 (95% CI) ppbv implying that Mars is episodically producing methane from an additional unknown source.
Original languageEnglish
Article number1261713
Pages (from-to)415-417
Number of pages3
JournalScience
Volume347
Issue number6220
Early online date23 Jan 2015
DOIs
Publication statusPublished - 23 Jan 2015

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