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Detection of CO2 leakage from a simulated sub-seabed storage site using three different types of pCO2 sensors

Detection of CO2 leakage from a simulated sub-seabed storage site using three different types of pCO2 sensors
Detection of CO2 leakage from a simulated sub-seabed storage site using three different types of pCO2 sensors
This work is focused on results from a recent controlled sub-seabed in situ carbon dioxide (CO2) release experiment carried out during May–October 2012 in Ardmucknish Bay on the Scottish west coast. Three types of pCO2 sensors (fluorescence, NDIR and ISFET-based technologies) were used in combination with multiparameter instruments measuring oxygen, temperature, salinity and currents in the water column at the epicentre of release and further away. It was shown that distribution of seafloor CO2 emissions features high spatial and temporal heterogeneity. The highest pCO2 values (?1250 ?atm) were detected at low tide around a bubble stream and within centimetres distance from the seafloor. Further up in the water column, 30–100 cm above the seabed, the gradients decreased, but continued to indicate elevated pCO2 at the epicentre of release throughout the injection campaign with the peak values between 400 and 740 ?atm. High-frequency parallel measurements from two instruments placed within 1 m from each other, relocation of one of the instruments at the release site and 2D horizontal mapping of the release and control sites confirmed a localized impact from CO2 emissions. Observed effects on the water column were temporary and post-injection recovery took <7 days.

A multivariate statistical approach was used to recognize the periods when the system was dominated by natural forcing with strong correlation between variation in pCO2 and O2, and when it was influenced by purposefully released CO2.

Use of a hydrodynamic circulation model, calibrated with in situ data, was crucial to establishing background conditions in this complex and dynamic shallow water system.
CCS, QICS, CO2 release, Leakage detection, pCO2 sensors
1750-5836
121-134
Atamanchuk, Dariia
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Tengberg, Anders
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Aleynik, Dmitry
07ad3616-ffc3-4631-a8c4-660587594635
Fietzek, Peer
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Shitashima, Kiminori
b3cd38a7-051e-4b82-bbb9-d35f40d7c6e4
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Hall, Per O.J.
e4df9bca-b009-4115-bbf9-0bee956885a9
Stahl, Henrik
bdd6e6a3-906e-4714-855a-3634cf0d471b
Atamanchuk, Dariia
60128feb-5b31-4ffc-946b-840d4091da08
Tengberg, Anders
0b65cea6-c988-49f5-9838-9d0ec732f22b
Aleynik, Dmitry
07ad3616-ffc3-4631-a8c4-660587594635
Fietzek, Peer
96006f83-9f7d-46df-adb4-33501ff24124
Shitashima, Kiminori
b3cd38a7-051e-4b82-bbb9-d35f40d7c6e4
Lichtschlag, Anna
be1568d9-cc63-4f85-bd38-a93dfd7e245f
Hall, Per O.J.
e4df9bca-b009-4115-bbf9-0bee956885a9
Stahl, Henrik
bdd6e6a3-906e-4714-855a-3634cf0d471b

Atamanchuk, Dariia, Tengberg, Anders, Aleynik, Dmitry, Fietzek, Peer, Shitashima, Kiminori, Lichtschlag, Anna, Hall, Per O.J. and Stahl, Henrik (2015) Detection of CO2 leakage from a simulated sub-seabed storage site using three different types of pCO2 sensors. International Journal of Greenhouse Gas Control, 38, 121-134. (doi:10.1016/j.ijggc.2014.10.021).

Record type: Article

Abstract

This work is focused on results from a recent controlled sub-seabed in situ carbon dioxide (CO2) release experiment carried out during May–October 2012 in Ardmucknish Bay on the Scottish west coast. Three types of pCO2 sensors (fluorescence, NDIR and ISFET-based technologies) were used in combination with multiparameter instruments measuring oxygen, temperature, salinity and currents in the water column at the epicentre of release and further away. It was shown that distribution of seafloor CO2 emissions features high spatial and temporal heterogeneity. The highest pCO2 values (?1250 ?atm) were detected at low tide around a bubble stream and within centimetres distance from the seafloor. Further up in the water column, 30–100 cm above the seabed, the gradients decreased, but continued to indicate elevated pCO2 at the epicentre of release throughout the injection campaign with the peak values between 400 and 740 ?atm. High-frequency parallel measurements from two instruments placed within 1 m from each other, relocation of one of the instruments at the release site and 2D horizontal mapping of the release and control sites confirmed a localized impact from CO2 emissions. Observed effects on the water column were temporary and post-injection recovery took <7 days.

A multivariate statistical approach was used to recognize the periods when the system was dominated by natural forcing with strong correlation between variation in pCO2 and O2, and when it was influenced by purposefully released CO2.

Use of a hydrodynamic circulation model, calibrated with in situ data, was crucial to establishing background conditions in this complex and dynamic shallow water system.

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Published date: July 2015
Keywords: CCS, QICS, CO2 release, Leakage detection, pCO2 sensors
Organisations: Marine Geoscience

Identifiers

Local EPrints ID: 378248
URI: http://eprints.soton.ac.uk/id/eprint/378248
ISSN: 1750-5836
PURE UUID: c6d241ae-0887-4247-853a-dc1dd28938ca

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Date deposited: 22 Jun 2015 12:01
Last modified: 12 Nov 2019 06:46

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Contributors

Author: Dariia Atamanchuk
Author: Anders Tengberg
Author: Dmitry Aleynik
Author: Peer Fietzek
Author: Kiminori Shitashima
Author: Anna Lichtschlag
Author: Per O.J. Hall
Author: Henrik Stahl

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