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Mechanistic insights into a hydrate contribution to the Paleocene-Eocene carbon cycle perturbation from coupled thermohydraulic simulations

Mechanistic insights into a hydrate contribution to the Paleocene-Eocene carbon cycle perturbation from coupled thermohydraulic simulations
Mechanistic insights into a hydrate contribution to the Paleocene-Eocene carbon cycle perturbation from coupled thermohydraulic simulations
During the Paleocene-Eocene Thermal Maximum (PETM), the carbon isotopic signature (?13C) of surface carbon-bearing phases decreased abruptly by at least 2.5 to 3.0 ‰. This carbon isotope excursion (CIE) has been attributed to widespread methane hydrate dissociation in response to rapid ocean warming. We ran a thermohydraulic modeling code to simulate hydrate dissociation due to ocean warming for various PETM scenarios. Our results show that hydrate dissociation in response to such warming can be rapid but suggest that methane release to the ocean is modest and delayed by hundreds to thousands of years after the onset of dissociation, limiting the potential for positive feedback from emissions-induced warming. In all of our simulations at least half of the dissociated hydrate methane remains beneath the seabed, suggesting that the pre-PETM hydrate inventory needed to account for all of the CIE is at least double that required for isotopic mass balance.
hydrate, methane, PETM
0094-8276
8637-8644
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Marin-Moreno, H.
d1daa2dc-3ece-4b9b-914a-0e463b77d414
Armstrong Mckay, D.I.
9e7fc75d-311e-4980-9911-288d965a9e56
Wilson, P.A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Marin-Moreno, H.
d1daa2dc-3ece-4b9b-914a-0e463b77d414
Armstrong Mckay, D.I.
9e7fc75d-311e-4980-9911-288d965a9e56
Wilson, P.A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6

Minshull, T.A., Marin-Moreno, H., Armstrong Mckay, D.I. and Wilson, P.A. (2016) Mechanistic insights into a hydrate contribution to the Paleocene-Eocene carbon cycle perturbation from coupled thermohydraulic simulations. Geophysical Research Letters, 43 (16), 8637-8644. (doi:10.1002/2016GL069676).

Record type: Article

Abstract

During the Paleocene-Eocene Thermal Maximum (PETM), the carbon isotopic signature (?13C) of surface carbon-bearing phases decreased abruptly by at least 2.5 to 3.0 ‰. This carbon isotope excursion (CIE) has been attributed to widespread methane hydrate dissociation in response to rapid ocean warming. We ran a thermohydraulic modeling code to simulate hydrate dissociation due to ocean warming for various PETM scenarios. Our results show that hydrate dissociation in response to such warming can be rapid but suggest that methane release to the ocean is modest and delayed by hundreds to thousands of years after the onset of dissociation, limiting the potential for positive feedback from emissions-induced warming. In all of our simulations at least half of the dissociated hydrate methane remains beneath the seabed, suggesting that the pre-PETM hydrate inventory needed to account for all of the CIE is at least double that required for isotopic mass balance.

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Accepted/In Press date: 28 July 2016
e-pub ahead of print date: 28 August 2016
Published date: 30 August 2016
Keywords: hydrate, methane, PETM
Organisations: Geology & Geophysics, Marine Geoscience, Geography & Environment, Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 398851
URI: https://eprints.soton.ac.uk/id/eprint/398851
ISSN: 0094-8276
PURE UUID: a72dfd1b-0be4-47a8-ba05-fb135c213e40
ORCID for T.A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379
ORCID for D.I. Armstrong Mckay: ORCID iD orcid.org/0000-0002-0020-7461

Catalogue record

Date deposited: 02 Aug 2016 12:20
Last modified: 26 Nov 2019 06:36

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Contributors

Author: T.A. Minshull ORCID iD
Author: H. Marin-Moreno
Author: D.I. Armstrong Mckay ORCID iD
Author: P.A. Wilson

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