Biogenic Methane on Mars?
The presence of methane in the near-surface atmosphere of Mars is a scientifically established fact (Krasnopolsky 2006; Formisano et al. 2004), and Formisano et al. (2004) have stressed the direct correlation to locations with an enhanced presence of water/ice. The global production rate of methane...
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ftawi:oai:epic.awi.de:18118 2024-09-15T18:11:29+00:00 Biogenic Methane on Mars? Wagner, Dirk Möhlmann, D. 2007 https://epic.awi.de/id/eprint/18118/ https://hdl.handle.net/10013/epic.28651 unknown Wagner, D. and Möhlmann, D. (2007) Biogenic Methane on Mars? , European Mars Science and Exploration Conference: Mars Express and ExoMars, ESA-ESTEC, Noordwijk, The NetherlandsNovember 2007. . hdl:10013/epic.28651 EPIC3European Mars Science and Exploration Conference: Mars Express and ExoMars, ESA-ESTEC, Noordwijk, The NetherlandsNovember 2007., 12 Conference notRev 2007 ftawi 2024-06-24T04:00:13Z The presence of methane in the near-surface atmosphere of Mars is a scientifically established fact (Krasnopolsky 2006; Formisano et al. 2004), and Formisano et al. (2004) have stressed the direct correlation to locations with an enhanced presence of water/ice. The global production rate of methane on Mars has been estimated to be of the order of about 3 x 105 kg methane per (terrestrial) year, or about 34 kg methane per hour. Liquid interfacial water in form of premelted ice and adsorbed water is unavoidable in case of the presence of water-ice and of atmospheric water vapor, also under martian conditions (Möhlmann, 2007). The resulting freezing point depression will cause interfacial water to remain liquid down to about 190 K. Thus, the observed direct correlation between the local or regional presence of atmospheric methane and of ice is understood as an indication for a direct coupling between methane and liquid interfacial water in the subsurface of Mars.As been shown by laboratory experiments, terrestrial methanogenic archaea isolated from Siberian permafrost soils are well able to survive martian thermophysical conditions at least over the experiment duration of three weeks (Morozova et al., 2007). These martian conditions were a diurnal temperature profile between 210 K and 280 K, a related diurnal profile of the atmospheric water content between saturation (aW = 1) and dry (aW < 0.03) conditions, all at a total pressure of 6 mbar CO2. Methanogenic archaea from terrestrial permafrost survived these conditions, while methanogens from non-permafrost environments did not show any activity after the simulation, which correspond with a drastically decrease in their cell numbers (< 5% in comparison to the amount of the beginning of the experiment; Fig. 1). Furthermore, the survival potential of methanogens from permafrost exposed to different environmental stress conditions such as low temperature (down to 78°C), high salinity (up to 6 M NaCl), starvation (up to 3 months), long-term freezing (up to two ... Conference Object Ice permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
The presence of methane in the near-surface atmosphere of Mars is a scientifically established fact (Krasnopolsky 2006; Formisano et al. 2004), and Formisano et al. (2004) have stressed the direct correlation to locations with an enhanced presence of water/ice. The global production rate of methane on Mars has been estimated to be of the order of about 3 x 105 kg methane per (terrestrial) year, or about 34 kg methane per hour. Liquid interfacial water in form of premelted ice and adsorbed water is unavoidable in case of the presence of water-ice and of atmospheric water vapor, also under martian conditions (Möhlmann, 2007). The resulting freezing point depression will cause interfacial water to remain liquid down to about 190 K. Thus, the observed direct correlation between the local or regional presence of atmospheric methane and of ice is understood as an indication for a direct coupling between methane and liquid interfacial water in the subsurface of Mars.As been shown by laboratory experiments, terrestrial methanogenic archaea isolated from Siberian permafrost soils are well able to survive martian thermophysical conditions at least over the experiment duration of three weeks (Morozova et al., 2007). These martian conditions were a diurnal temperature profile between 210 K and 280 K, a related diurnal profile of the atmospheric water content between saturation (aW = 1) and dry (aW < 0.03) conditions, all at a total pressure of 6 mbar CO2. Methanogenic archaea from terrestrial permafrost survived these conditions, while methanogens from non-permafrost environments did not show any activity after the simulation, which correspond with a drastically decrease in their cell numbers (< 5% in comparison to the amount of the beginning of the experiment; Fig. 1). Furthermore, the survival potential of methanogens from permafrost exposed to different environmental stress conditions such as low temperature (down to 78°C), high salinity (up to 6 M NaCl), starvation (up to 3 months), long-term freezing (up to two ... |
format |
Conference Object |
author |
Wagner, Dirk Möhlmann, D. |
spellingShingle |
Wagner, Dirk Möhlmann, D. Biogenic Methane on Mars? |
author_facet |
Wagner, Dirk Möhlmann, D. |
author_sort |
Wagner, Dirk |
title |
Biogenic Methane on Mars? |
title_short |
Biogenic Methane on Mars? |
title_full |
Biogenic Methane on Mars? |
title_fullStr |
Biogenic Methane on Mars? |
title_full_unstemmed |
Biogenic Methane on Mars? |
title_sort |
biogenic methane on mars? |
publishDate |
2007 |
url |
https://epic.awi.de/id/eprint/18118/ https://hdl.handle.net/10013/epic.28651 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
EPIC3European Mars Science and Exploration Conference: Mars Express and ExoMars, ESA-ESTEC, Noordwijk, The NetherlandsNovember 2007., 12 |
op_relation |
Wagner, D. and Möhlmann, D. (2007) Biogenic Methane on Mars? , European Mars Science and Exploration Conference: Mars Express and ExoMars, ESA-ESTEC, Noordwijk, The NetherlandsNovember 2007. . hdl:10013/epic.28651 |
_version_ |
1810449078099640320 |