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Phosphorus behavior in sediments during a sub-seabed CO2 controlled release experiment

Phosphorus behavior in sediments during a sub-seabed CO2 controlled release experiment
Phosphorus behavior in sediments during a sub-seabed CO2 controlled release experiment
The CO2 controlled release experiment “Quantifying and Monitoring Potential Ecosystem Impacts of Geological Carbon Storage” (QICS) assessed the impacts of potential CO2 leakage from sub-seabed carbon capture and storage reservoirs to the marine environment. During QICS, CO2 gas was released into shallow sediment in Ardmucknish Bay, Scotland, in the spring and summer of 2012. As part of this project, we investigated the effects of CO2 leakage on sedimentary phosphorus (P), an essential nutrient for marine productivity. We found no statistically significant effects during QICS, as the solid-phase P content in the sediment was constant before, during, and after exposure to CO2. However, laboratory experiments using marine sediment standard materials as well as QICS sediment revealed substantial differences among these different sediment types in their potential for P release during CO2 exposure. Employing the SEDEX sequential extraction technique to determine the sizes of the major P pools in the sediments, we showed that calcium-bound P can be easily released by CO2 exposure, whereas iron-bound P is a major sink of released P. The overall impacts of CO2 leakage on sediment P behavior appear to be low compared to natural variability.
Sub-seabed carbon capture and storage, CCS, CO2 leakage, Marine sediment, Phosphorus, Sequential extraction
1750-5836
102-109
Tsukasaki, Ayumi
6798a58b-de2f-428f-a442-103a5abea346
Suzumura, Masahiro
4de47239-491d-468a-aca4-0eef3632b50e
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Stahl, Henrik
bdd6e6a3-906e-4714-855a-3634cf0d471b
James, Rachael H.
79aa1d5c-675d-4ba3-85be-fb20798c02f4
Tsukasaki, Ayumi
6798a58b-de2f-428f-a442-103a5abea346
Suzumura, Masahiro
4de47239-491d-468a-aca4-0eef3632b50e
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Stahl, Henrik
bdd6e6a3-906e-4714-855a-3634cf0d471b
James, Rachael H.
79aa1d5c-675d-4ba3-85be-fb20798c02f4

Tsukasaki, Ayumi, Suzumura, Masahiro, Lichtschlag, Anna, Stahl, Henrik and James, Rachael H. (2015) Phosphorus behavior in sediments during a sub-seabed CO2 controlled release experiment. International Journal of Greenhouse Gas Control, 38, 102-109. (doi:10.1016/j.ijggc.2014.12.023).

Record type: Article

Abstract

The CO2 controlled release experiment “Quantifying and Monitoring Potential Ecosystem Impacts of Geological Carbon Storage” (QICS) assessed the impacts of potential CO2 leakage from sub-seabed carbon capture and storage reservoirs to the marine environment. During QICS, CO2 gas was released into shallow sediment in Ardmucknish Bay, Scotland, in the spring and summer of 2012. As part of this project, we investigated the effects of CO2 leakage on sedimentary phosphorus (P), an essential nutrient for marine productivity. We found no statistically significant effects during QICS, as the solid-phase P content in the sediment was constant before, during, and after exposure to CO2. However, laboratory experiments using marine sediment standard materials as well as QICS sediment revealed substantial differences among these different sediment types in their potential for P release during CO2 exposure. Employing the SEDEX sequential extraction technique to determine the sizes of the major P pools in the sediments, we showed that calcium-bound P can be easily released by CO2 exposure, whereas iron-bound P is a major sink of released P. The overall impacts of CO2 leakage on sediment P behavior appear to be low compared to natural variability.

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Tsukasaki et al_phosphorus.pdf - Accepted Manuscript
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Published date: July 2015
Keywords: Sub-seabed carbon capture and storage, CCS, CO2 leakage, Marine sediment, Phosphorus, Sequential extraction
Organisations: Geochemistry, Marine Geoscience

Identifiers

Local EPrints ID: 378242
URI: http://eprints.soton.ac.uk/id/eprint/378242
ISSN: 1750-5836
PURE UUID: 2b1d5896-4b01-4030-8e0c-e1e7b0dfdc35

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Date deposited: 22 Jun 2015 10:55
Last modified: 20 Jul 2019 06:06

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Contributors

Author: Ayumi Tsukasaki
Author: Masahiro Suzumura
Author: Anna Lichtschlag
Author: Henrik Stahl

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