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Low Upper Limit to Methane Abundance on Mars
Jet Propulsion Laboratory, California Institute of Technology, Pasadena.
NASA Goddard Space Flight Center.
Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor.
Jet Propulsion Laboratory, California Institute of Technology, Pasadena.
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2013 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 342, no 6156, p. 355-357, article id 1242902Article in journal (Refereed) Published
Abstract [en]

By analogy with Earth, methane in the Martian atmosphere is a potential signature of ongoing or past biological activity. During the past decade, Earth-based telescopic observations reported “plumes” of methane of tens of parts per billion by volume (ppbv), and those from Mars orbit showed localized patches, prompting speculation of sources from subsurface bacteria or nonbiological sources. From in situ measurements made with the Tunable Laser Spectrometer (TLS) on Curiosity using a distinctive spectral pattern specific to methane, we report no detection of atmospheric methane with a measured value of 0.18 ± 0.67 ppbv corresponding to an upper limit of only 1.3 ppbv (95% confidence level), which reduces the probability of current methanogenic microbial activity on Mars and limits the recent contribution from extraplanetary and geologic sources.

Place, publisher, year, edition, pages
2013. Vol. 342, no 6156, p. 355-357, article id 1242902
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
URN: urn:nbn:se:ltu:diva-4440DOI: 10.1126/science.1242902PubMedID: 24051245Scopus ID: 84885847381Local ID: 262c18b7-ee5f-48c9-a478-b58b0afdcfb7OAI: oai:DiVA.org:ltu-4440DiVA: diva2:977313
Note
Upprättat; 2013; Bibliografisk uppgift: Javier Martín-Torres ingår i the MSL Science Team.; 20150306 (ninhul)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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