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Millennial-scale shifts in the methane hydrate stability zone due to Quaternary climate change

Lookup NU author(s): Professor Richard Davies, Dr Miguel Morales Maqueda

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).


Abstract

Establishing if past millennial-scale climate change affected the stability of marine methane hydrate is important for our understanding of climatic change and determining the fate of marine hydrates in a future warmer world. We show using three-dimensional seismic data offshore of Mauritania, that episodic, millennial-scale shifts of the base of the hydrate stability zone can be imaged below the ocean floor. Process modelling suggests the base of the hydrate stability zone should have shallowed and deepened in response to climate change over the last ~150,000 years. Specifically, there is seismic evidence for millennial-scale shifts during the Holocene (~11,700 years) at a temporal resolution that has previously been unrealised. This is the first evidence that millennial-scale climatic cycles caused hydrate formation and dissociation and that hydrate instability should be expected in a warming world.


Publication metadata

Author(s): Davies RJ, Morales Maqueda AL, Li A, Ganopolski A

Publication type: Article

Publication status: Published

Journal: Geology

Year: 2017

Volume: 45

Issue: 11

Pages: 1027-1030

Online publication date: 05/10/2017

Acceptance date: 17/08/2017

Date deposited: 22/08/2017

ISSN (print): 0091-7613

ISSN (electronic): 1943-2682

Publisher: Geological Society of America

URL: https://doi.org/10.1130/G39611.1

DOI: 10.1130/G39611.1


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