Buoyant currents arrested by convective dissolution
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Juanes_Buoyant currents.pdf
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881.75 KB
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Author(s)
MacMinn, Christopher W.
Juanes, Ruben
Date Issued
May 2013
Journal
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Citation
MacMinn, Christopher W., and Ruben Juanes. “Buoyant Currents Arrested by Convective Dissolution.” Geophys. Res. Lett. 40, no. 10 (May 28, 2013): 2017–2022. © 2013 American Geophysical Union
Version
Final published version
Abstract
When carbon dioxide (CO[subscript 2]) dissolves into water, the density of water increases. This seemingly insubstantial phenomenon has profound implications for geologic carbon sequestration. Here we show, by means of laboratory experiments with analog fluids, that the up-slope migration of a buoyant current of CO[subscript 2] is arrested by the convective dissolution that ensues from a fingering instability at the moving CO[subscript 2]-groundwater interface. We consider the effectiveness of convective dissolution as a large-scale trapping mechanism in sloping aquifers, and we show that a small amount of slope is beneficial compared to the horizontal case. We study the development and coarsening of the fingering instability along the migrating current and predict the maximum migration distance of the current with a simple sharp-interface model. We show that convective dissolution exerts a powerful control on CO[subscript 2] plume dynamics and, as a result, on the potential of geologic carbon sequestration.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1002/grl.50473
