Detection of Methane in the Atmosphere of Mars

@article{Formisano2004DetectionOM,
  title={Detection of Methane in the Atmosphere of Mars},
  author={Vittorio Formisano and Sushil Atreya and Thérèse Encrenaz and Nikolai Ignatiev and Marco Giuranna},
  journal={Science},
  year={2004},
  volume={306},
  pages={1758 - 1761}
}
We report a detection of methane in the martian atmosphere by the Planetary Fourier Spectrometer onboard the Mars Express spacecraft. The global average methane mixing ratio is found to be 10 ± 5 parts per billion by volume (ppbv). However, the mixing ratio varies between 0 and 30 ppbv over the planet. The source of methane could be either biogenic or nonbiogenic, including past or present subsurface microorganisms, hydrothermal activity, or cometary impacts. 
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References

SHOWING 1-10 OF 49 REFERENCES
The state, potential distribution, and biological implications of methane in the Martian crust
The search for life on Mars has recently focused on its potential survival in deep (>2 km) subpermafrost aquifers where anaerobic bacteria, similar to those found in deep subsurface ecosystems onExpand
The delivery of organic matter from asteroids and comets to the early surface of Mars
Carbon delivered to the Earth by interplanetary dust particles may have been an important source of pre-biotic organic matter (Anders, 1989). Interplanetary dust is shown to deliver anExpand
Detection of methane in the martian atmosphere: evidence for life?
Using the Fourier Transform Spectrometer at the Canada–France–Hawaii Telescope, we observed a spectrum of Mars at the P-branch of the strongest CH4 band at 3.3 µm with resolving power of 180,000 forExpand
Atmospheric biomarkers of subsurface life on Mars
If life exists beneath the Martian surface similar to terrestrial bacteria that rely upon chemical reactions involving H_2 and/or CO as energy sources, then it may be possible to infer its existenceExpand
Atmospheric photochemistry above possible martian hot spots
Abstract Considering the possibility of outgassing from some localized sources on Mars, we have developed a one-dimensional photochemical model that includes methane (CH4), sulfur dioxide (SO2) andExpand
Formation of methane in comet impacts: implications for Earth, Mars, and Titan
Abstract We calculate the amount of methane that may form via reactions catalyzed by metal-rich dust that condenses in the wake of large cometary impacts. Previous models of the gas-phase chemistryExpand
Detection of Molecular Hydrogen in the Atmosphere of Mars
TLDR
Analysis of D fractionation among a few reservoirs of ice, water vapor, and molecular hydrogen on Mars implies that a global ocean more than 30 meters deep was lost since the end of hydrodynamic escape. Expand
Photochemistry of Planetary Atmospheres
1. Introduction 2. Solar Flux and Molecular Absorption 3. Chemical Kinetics 4. Origins 5. Giant Planets 6. Satellites and Pluto 7. Mars 8. Venus 9. Earth: Imprint of Life 10. Earth: Human Impact
Stability of the Martian atmosphere: Is heterogeneous catalysis essential?
A comprehensive homogeneous gas phase photochemical model is developed to study the problem of stability of the Martian atmosphere. The one-dimensional model extends from the ground up to 220 km,Expand
Deep bacterial biosphere in Pacific Ocean sediments
ALTHOUGH around 70% of the Earth's surface is marine, little is known about the microbiology of underlying sediments, which can be more than a kilometre deep1. Selective degradation of organic matterExpand
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4
5
...