Abstract
The concept of network returnability is reformulated as an equilibrium constant for a reaction network. Using this concept we study the atmospheric reaction networks of Earth, Mars, Venus and Titan. We found that the reaction network in the Earth’s atmosphere has the largest disequilibrium, followed by that of Titan which is still far from the most returnable atmospheres of Mars and Venus. We find that the chemical species with null or very low returnability are those in the highest disequilibrium in their respective atmospheres mainly due to physical, biogenic and/or anthropogenic mechanisms.
Graphical Abstract
Highlights: A network theoretic approach to departure from equilibrium of reaction systems. Earth's atmosphere largely departed from equilibrium. Titan's atmosphere follows Earth in disequlibrium. Venus and Mars are the most in-equilibrium atmospheres. Biogenic species departs significantly from equilibrium.
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Estrada, E. Returnability as a criterion of disequilibrium in atmospheric reactions networks. J Math Chem 50, 1363–1372 (2012). https://doi.org/10.1007/s10910-012-9977-x
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DOI: https://doi.org/10.1007/s10910-012-9977-x