The fate of carbon dioxide in water-rich fluids at extreme conditions

Abstract

Investigating the fate of dissolved carbon dioxide under extreme conditions is critical to understanding the deep carbon cycle in the Earth, a process that ultimately influences global climate change. We used first-principles molecular dynamics simulations to study carbonates and carbon dioxide dissolved in water at pressures (P) and temperatures (T) approximating the conditions of the Earth's upper mantle. Contrary to popular geochemical models assuming that molecular CO${}_2$(aq) is the major carbon species present in water under deep earth conditions, we found that at 11 GPa and 1000 K carbon exists almost entirely in the forms of solvated carbonate (CO${}_3^{2-}$) and bicarbonate (HCO${}_3^{-}$) ions, and that even carbonic acid (H${}_2$CO${}_3$(aq)) is more abundant than CO${}_2$(aq). Furthermore, our simulations revealed that ion pairing between Na${}^{+}$ and CO${}_3^{2-}$/HCO${}_3^{-}$ is greatly affected by P-T conditions, decreasing with increasing pressure at 800$\sim$1000 K. Our results suggest that in the Earth's upper mantle, water-rich geo-fluids transport a majority of carbon in the form of rapidly interconverting CO${}_3^{2-}$ and HCO${}_3^{-}$ ions, not solvated CO${}_2$(aq) molecules.

25 pages, 4 figures

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Cited by in corpus (8)

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• Internal Structure and CO${}_2$ Reservoirs of Habitable Water-Worlds
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• Carbon Dioxide, Bicarbonate and Carbonate Ions in Aqueous Solutions at Deep Earth Conditions
• Unveiling the hidden reaction kinetic network of carbon dioxide in supercritical aqueous solutions
• A unified machine-learning framework for ab initio multiscale modeling of liquids
• Formation of abiogenic hydrocarbons in supercritical fluids under Earth's upper mantle conditions