Deep ocean experiments with fossil fuel carbon dioxide: Creation and sensing of a controlled plume at 4 km depth
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ID: 298775
2005
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Abstract
The rapidly rising levels of atmospheric and oceanic CO 2 from the burning of fossil fuels has lead to well-established international concerns over dangerous anthropogenic interference with climate.Disposal of captured fossil fuel CO 2 either underground, or in the deep ocean, has been suggested as one means of ameliorating this problem.While the basic thermodynamic properties of both CO 2 and seawater are well known, the problem of interaction of the two fluids in motion to create a plume of high CO 2 /low pH seawater has been modeled, but not tested.We describe here a novel experiment designed to initiate study of this problem.We constructed a small flume, which was deployed on the sea floor at 4 km depth by a remotely operated vehicle, and filled with liquid CO 2 .Seawater flow was forced across the surface by means of a controllable thruster.Obtaining quantitative data on the plume created proved to be challenging.We observed and sensed the interface and boundary layers, the formation of a solid hydrate, and the low pH/high CO 2 plume created, with both pH and conductivity sensors placed downstream.Local disequilibrium in the CO 2 system components was observed due to the finite hydration reaction rate, so that the pH sensors closest to the source only detected a fraction of the CO 2 emitted.The free CO 2 molecules were detected through the decrease in conductivity observed, and the disequilibrium was confirmed through trapping a sample in a flow cell and observing an unusually rapid drop in pH to an equilibrium value.
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openalex_W2127883916
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| Authors | Peter G. Brewer, Edward T. Peltzer, P. M. Walz, Izuo Aya, Kenji Yamane, Ryuji Kojima, Yasuharu Nakajima, Noriko Nakayama, Peter M. Haugan, Truls Johannessen |
| Journal | journal of marine research |
| Year | 2005 |
| DOI |
10.1357/0022240053693860
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| URL | |
| Keywords | Keywords not found |
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