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Title: Mars Methane Detection and Variability at Gale Crater
Authors: Webster, CR
Mahaffy, P
Atreya, SK
Flesch, GJ
Mischna, MA
Meslin, P-Y
Farley, KA
Conrad, PG
Christensen, LE
Pavlov, AA
Martin-Torres, J
Zorzano, M-P
McConnochie, TH
Owen, T
Eigenbrode, JE
Glavin, DP
Steele, A
Malespin, A
Archer, DP
Sutter, B
Coll, P
Freissinet, P
McKay, CP
Moores, JE
Schwenzer, SP
Bridges, John C.
Navarro-Gonzalez, R
Gellert, R
Lemmon, MT
First Published: 16-Dec-2014
Publisher: AGU
Citation: Science, 2015, 347, pp. 415-417 (2)
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 ±0.21 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 7.19 ±1.99 (95% CI) ppbv implying that Mars is episodically producing methane from an additional unknown source.
DOI Link: 10.1126/science.1261713
ISSN: 0036-8075
eISSN: 1095-9203
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO. Copyright the authors.
Description: Supplementary materials
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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MSL_Methane_Science_2014.pdfPost-review (final submitted)358.88 kBAdobe PDFView/Open
1261713_CH4_CompletePaperRevised_17Nov2014.pdfPost-review (final submitted)1.62 MBAdobe PDFView/Open

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