No detection of methane on Mars from early ExoMars Trace Gas Orbiter observations

@article{Korablev2019NoDO,
  title={No detection of methane on Mars from early ExoMars Trace Gas Orbiter observations},
  author={Oleg I. Korablev and Ann Carine Vandaele and Franck Montmessin and Anna A. Fedorova and Alexander Trokhimovskiy and François Forget and Franck Lef{\'e}vre and Frank Daerden and Ian R. Thomas and Lo{\"i}c Trompet and Justin T. Erwin and Shohei Aoki and S{\'e}verine Robert and Lori Neary and S{\'e}bastien Viscardy and Alexey V. Grigoriev and Nikolay I. Ignatiev and Alexey V. Shakun and Andrey Patrakeev and Denis A. Belyaev and J L Bertaux and Kevin S. Olsen and Lucio Baggio and Juan Alday and Yu. S. Ivanov and Bojan Ristic and John Mason and Yannick Willame and C{\'e}dric Depiesse and Laszlo Hetey and Sophie Berkenbosch and Roland Clairquin and Claudio Queirolo and Bram Beeckman and Eddy Neefs and Manish R. Patel and Giancarlo Bellucci and J{\'o}se Juan Lopez‐Moreno and Colin F Wilson and Giuseppe Etiope and Lev M. Zelenyi and H{\aa}kan Svedhem and Jorge L. Vago},
  journal={Nature},
  year={2019},
  volume={568},
  pages={517-520}
}
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 concentrations2–5. 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… 
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During its five years of operation, the Sample Analysis at Mars (SAM) Tunable Laser Spectrometer (TLS) on board the Curiosity rover has detected six methane spikes above a low background abundance
The climatology of carbon monoxide on Mars as observed by NOMAD nadir-geometry observations
Abstract More than a full Martian year of observations have now been made by the Nadir Occultation for MArs Discovery (NOMAD) instrument suite on-board the ExoMars Trace Gas Orbiter. Radiative
Isotopes of chlorine from HCl in the Martian atmosphere
Hydrogen chloride gas was recently discovered in the atmosphere of Mars during southern summer seasons. Its connection with potential chlorine reservoirs and the related atmospheric chemistry is now
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References

SHOWING 1-10 OF 47 REFERENCES
Low Upper Limit to Methane Abundance on Mars
TLDR
From in situ measurements made with the Tunable Laser Spectrometer on Curiosity using a distinctive spectral pattern specific to methane, no detection of atmospheric methane is reported, which reduces the probability of current methanogenic microbial activity on Mars and limits the recent contribution from extraplanetary and geologic sources.
Observed variations of methane on Mars unexplained by known atmospheric chemistry and physics
TLDR
It is found that photochemistry as currently understood does not produce measurable variations in methane concentrations, even in the case of a current, local and episodic methane release, and that the condensation–sublimation cycle of Mars’ carbon dioxide atmosphere can generate large-scale methane variations differing from those observed.
Independent confirmation of a methane spike on Mars and a source region east of Gale Crater
Reports of methane detection in the Martian atmosphere have been intensely debated. The presence of methane could enhance habitability and may even be a signature of life. However, no detection has
Background levels of methane in Mars’ atmosphere show strong seasonal variations
TLDR
In situ measurements at Gale crater made over a 5-year period by the Tunable Laser Spectrometer on the Curiosity rover show large seasonal variation in the background and occurrences of higher temporary spikes that are consistent with small localized sources of methane released from martian surface or subsurface reservoirs.
Mars methane detection and variability at Gale crater
TLDR
Curiosity confirms the presence and variability of atmospheric methane, implying episodic production from an unknown source, and reports of plumes or patches of methane in the martian atmosphere that vary over monthly time scales have defied explanation.
Atmospheric modeling of Mars methane surface releases
We utilize the MarsWRF general circulation model (GCM) to address the behavior of gas plumes in the Martian atmosphere, with the specific goal of characterizing the source of the recently identified
Methane Seepage on Mars: Where to Look and Why
TLDR
This work highlights the types of features on Mars that could be associated with methane release, including mud-volcano-like mounds in Acidalia or Utopia; proposed ancient springs in Gusev Crater, Arabia Terra, and Valles Marineris; and rims of large impact craters.
Is there methane on Mars
Abstract There have been several reports of methane on Mars at the 10–60 ppbv level. Most suggest that methane is both seasonally and latitudinally variable. Here we review why variable methane on
Search for methane and upper limits to ethane and SO2 on Mars
Abstract The IRTF/CSHELL observations in February 2006 at L S  = 10° and 63–93°W show ∼10 ppb of methane at 45°S to 7°N and ∼3 ppb outside this region that covers the deepest canyon Valles Marineris.
Methane on Mars and Habitability: Challenges and Responses
TLDR
Geological, geochemical, and biogeochemical processes related to the fundamental question: how active is Mars, geochemically and/or biologically, are examined, which suggests the possibility of redox gradients supporting life and habitability on Mars.
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