No detection of methane on Mars from early ExoMars Trace Gas Orbiter observations
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Oleg Korablev
- Function : Author
- PersonId : 756477
- ORCID : 0000-0003-1115-0656
Ann Carine Vandaele
- Function : Author
- PersonId : 945966
Franck Montmessin
- Function : Author
- PersonId : 174267
- IdHAL : franck-montmessin
- ORCID : 0000-0002-4187-1457
- IdRef : 092850618
Anna A. Fedorova
- Function : Author
- PersonId : 945555
Alexander Trokhimovskiy
- Function : Author
- PersonId : 960968
François Forget
- Function : Author
- PersonId : 742798
- IdHAL : francoisforget
- ORCID : 0000-0002-3262-4366
- IdRef : 074163922
Loic Trompet
- Function : Author
- PersonId : 995907
Shohei Aoki
- Function : Author
- PersonId : 755297
- ORCID : 0000-0001-6727-125X
Séverine Robert
- Function : Author
- PersonId : 875711
Alexey Shakun
- Function : Author
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Jean-Loup Bertaux
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Juan Alday
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Sophie Bauduin
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Fabiana da Pieve
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Bernd Funke
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Jean-Claude Gérard
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Marco Giuranna
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Francisco Gonzalez-Galindo
- Function : Author
- PersonId : 1033340
Davide Grassi
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Sandrine Guerlet
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- IdHAL : sandrine-guerlet
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- IdRef : 148622453
Yasumasa Kasaba
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David Kass
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Armin Kleinböhl
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Gaetan Lacombe
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Stephen Lewis
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Mikhail Luginin
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Giuliano Liuzzi
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Manuel López-Puertas
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Anni Määttänen
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Emmanuel Marcq
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Ehouarn Millour
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Hiromu Nakagawa
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Arianna Piccialli
- Function : Author
- PersonId : 1043905
Cathy Quantin-Nataf
- Function : Author
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Valérie Wilquet
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Paulina Wolkenberg
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Abstract
The detection of methane on Mars has been interpreted as indicating that geochemical or biotic activities could persist on Mars today1. A number of different measurements of methane show evidence of transient, locally elevated methane concentrations and seasonal variations in background methane concentrations2,3,4,5. These measurements, however, are difficult to reconcile with our current understanding of the chemistry and physics of the Martian atmosphere6,7, which—given methane’s lifetime of several centuries—predicts an even, well mixed distribution of methane1,6,8. 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 detections2,4. We suggest that reconciliation between the present findings and the background methane concentrations found in the Gale crater4 would require an unknown process that can rapidly remove or sequester methane from the lower atmosphere before it spreads globally.
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