Low Upper Limit to Methane Abundance on Mars

Webster, Christopher R.Jet Propulsion Laboratory, California Institute of Technology, Pasadena (författare)

Upprättat; 2013; Bibliografisk uppgift: Javier Martín-Torres ingår i the MSL Science Team.; 20150306 (ninhul)
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.

Mahaffy, Paul R.NASA Goddard Space Flight Center (författare)
Atreya, Sushil K.Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor (författare)
Flesch, Gregory J.Jet Propulsion Laboratory, California Institute of Technology, Pasadena (författare)
Farley, Kenneth A.Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena (författare)
Martin-Torres, JavierCentro de Astrobiología (CAB)(Swepub:ltu)javmar (författare)
Jet Propulsion Laboratory, California Institute of Technology, PasadenaNASA Goddard Space Flight Center (creator_code:org_t)

Ingår i:Science: American Association for the Advancement of Science (AAAS)342:6156, s. 355-3570036-80751095-9203

Av författaren/redakt...: Webster, Christo ...; Mahaffy, Paul R.; Atreya, Sushil K ...; Flesch, Gregory ...; Farley, Kenneth ...; Martin-Torres, J ...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Rymd och flygtek ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.