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- W149737454 abstract "Most of the present researches focus on find molecules which can address the availability for life on other planets. Chemical disequilibrium of the Earth’s atmospheric composition has long been seen as a consequence of widespread life on a planet [4]. While a biological explanation for the presence of some molecules may be plausible, it is also possible that their source are non-biological reactions. The chemical disequilibrium can be recognized in the contemporaneous presence of usually reacting species, such as molecular oxygen, reduced gasses, reduced carbon in biota, and the reduced crust of the solid Earth. We demonstrate with a first order estimate that chemical disequilibrium in the atmosphere results primarily from photosynthetic activity. We start by describing the atmosphere as a closed thermodynamic system on suitable time scales, since its chemical activity is faster than matter inflows. Consequently, the atmosphere should be driven towards the thermodynamic equilibrium state by a number of chemical processes. In conclusion, we suggest that the extent of chemical disequilibrium is the most general biomarker to identify widespread life on other planetary systems, but that this biomarker is only suitable for detecting photosynthetic life.." @default.
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- W149737454 date "2010-09-01" @default.
- W149737454 modified "2023-09-23" @default.
- W149737454 title "Atmospheric Chemical Disequilibrium as a Biomarker" @default.
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