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No detection of methane on Mars from early ExoMars Trace Gas Orbiter observations
Nature (London), 2019-04, Vol.568 (7753), p.517-520
2019
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Details

Autor(en) / Beteiligte
Titel
No detection of methane on Mars from early ExoMars Trace Gas Orbiter observations
Ist Teil von
  • Nature (London), 2019-04, Vol.568 (7753), p.517-520
Ort / Verlag
Goddard Space Flight Center: Nature Research
Erscheinungsjahr
2019
Beschreibungen/Notizen
  • The detection of methane on Mars has been interpreted as indicating that geochemical or biotic activities could persist on Mars today. A number of different measurements of methane show evidence of transient, locally elevated methane concentrations and seasonal variations in background methane concentrations. These measurements, however, are difficult to reconcile with our current understanding of the chemistry and physics of the Martian atmosphere, which—given methane’s lifetime of several centuries—predicts an even, well mixed distribution of methane. Here we report highly sensitive measurements of the atmosphere of Mars in an attempt to detect methane, using the ACS and NOMAD instruments onboard the ESA-Roscosmos ExoMars Trace Gas Orbiter from April to August 2018. We did not detect any methane over a range of latitudes in both hemispheres, obtaining an upper limit for methane of about 0.05 parts per billion by volume, which is 10 to 100 times lower than previously reported positive detections. We suggest that reconciliation between the present findings and the background methane concentrations found in the Gale crater would require an unknown process that can rapidly remove or sequester methane from the lower atmosphere before it spreads globally.
Sprache
Englisch
Identifikatoren
ISSN: 0028-0836, 1476-4687
eISSN: 1476-4687
DOI: 10.1038/s41586-019-1096-4
Titel-ID: cdi_swepub_primary_oai_DiVA_org_ltu_73581
Format
–
Schlagworte
ACS, Astrophysics, Atmosfärsvetenskap, Atmosphere, Atmospheric aerosols, Atmospheric methane, Atmospheric science, Aérospatiale, astronomie & astrophysique, detection, Discovery and exploration, EXOMARS, ExoMars mission, Gas analyzers, Gases, General circulation models, Geosciences (General), Hemispheres, Laboratories, limit, Lower atmosphere, Mars, Mars (Planet), Mars atmosphere, Mars craters, Mars probes, Methane, NOMAD, Observations, Organic chemistry, Physical, chemical, mathematical & earth Sciences, Physique, chimie, mathématiques & sciences de la terre, Russian Space Program, Science, Sciences of the Universe, Seasonal variations, Space science, astronomy & astrophysics, Trace Gars Orbiter, Trace gases

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