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Natural seabed gas leakage –- variability imposed by tidal cycles

Natural seabed gas leakage –- variability imposed by tidal cycles
Natural seabed gas leakage –- variability imposed by tidal cycles
The likelihood of leakage from sub-seabed Carbon Capture and Storage (CCS) sites has been debated since geological storage was proposed as an effective option to remove greenhouse gas emissions from the climate system. Within the marine environment, passive acoustics has been presented as a feasible way for detecting and quantifying any such leakage. When determining estimates of gas escape across the seabed, the influence of dynamic environments, introducing natural variations in seepage rates must be considered, including tidal cycles. Panarea, Sicily, is the location of a series of natural marine CO2 gas seeps and provides an excellent test bed to investigate variations of natural seabed gas leakage across a tidal cycle. A multivariate statistical approach was used to recognise the relationship when gas leakage is dominated by natural forcing.
We show that the tidal height correlates negatively with the bubble sound power spectral density, the gas flux, and the bubble size. The strength of the correlation can vary significantly for different investigated time periods of observation, showing sensitivity of tidal influence. Our results corroborate evidence that natural migration of CO2 through the seabed is moderated
by tidal cycles.
1-6
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
White, Paul
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Roche, Ben
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Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
Davis, John
7f762b01-375b-42c8-80cb-65baefffdb97
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Deponte, Michele
6ca3d1dd-6c7a-48bc-9d15-146e02c98f3e
Gordini, Emiliano
d2a0eda7-37d5-4b11-9801-328849da0ba2
Cotterle, Diego
5e887b72-0069-4014-960f-1b2dfa5c1759
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
Davis, John
7f762b01-375b-42c8-80cb-65baefffdb97
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Deponte, Michele
6ca3d1dd-6c7a-48bc-9d15-146e02c98f3e
Gordini, Emiliano
d2a0eda7-37d5-4b11-9801-328849da0ba2
Cotterle, Diego
5e887b72-0069-4014-960f-1b2dfa5c1759

Li, Jianghui, White, Paul, Roche, Ben, Bull, Jonathan, Davis, John, Leighton, Timothy, Deponte, Michele, Gordini, Emiliano and Cotterle, Diego (2019) Natural seabed gas leakage –- variability imposed by tidal cycles. OCEANS 2019 Seattle, Seattle, United States. 27 - 31 Oct 2019. pp. 1-6 . (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

The likelihood of leakage from sub-seabed Carbon Capture and Storage (CCS) sites has been debated since geological storage was proposed as an effective option to remove greenhouse gas emissions from the climate system. Within the marine environment, passive acoustics has been presented as a feasible way for detecting and quantifying any such leakage. When determining estimates of gas escape across the seabed, the influence of dynamic environments, introducing natural variations in seepage rates must be considered, including tidal cycles. Panarea, Sicily, is the location of a series of natural marine CO2 gas seeps and provides an excellent test bed to investigate variations of natural seabed gas leakage across a tidal cycle. A multivariate statistical approach was used to recognise the relationship when gas leakage is dominated by natural forcing.
We show that the tidal height correlates negatively with the bubble sound power spectral density, the gas flux, and the bubble size. The strength of the correlation can vary significantly for different investigated time periods of observation, showing sensitivity of tidal influence. Our results corroborate evidence that natural migration of CO2 through the seabed is moderated
by tidal cycles.

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More information

Accepted/In Press date: 15 July 2019
Venue - Dates: OCEANS 2019 Seattle, Seattle, United States, 2019-10-27 - 2019-10-31

Identifiers

Local EPrints ID: 432561
URI: https://eprints.soton.ac.uk/id/eprint/432561
PURE UUID: 9717ab24-026c-4bd6-a43e-3b5faa2a8f68
ORCID for Jianghui Li: ORCID iD orcid.org/0000-0002-2956-5940
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 18 Jul 2019 16:30
Last modified: 17 Sep 2019 01:09

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