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CO (sub 2) -driven ocean circulation changes as an amplifier of Paleocene-Eocene Thermal Maximum hydrate destabilization

Daniel J. Lunt, Paul J. Valdes, Tom Dunkley Jones, Andy Ridgwell, Alan M. Haywood, Daniela N. Schmidt, Robert Marsh and Mark Maslin
CO (sub 2) -driven ocean circulation changes as an amplifier of Paleocene-Eocene Thermal Maximum hydrate destabilization
Geology (Boulder) (October 2010) 38 (10): 875-878

Abstract

Changes in ocean circulation have been proposed as a trigger mechanism for the large coupled climate and carbon cycle perturbations at the Paleocene-Eocene Thermal Maximum (PETM, ca. 55 Ma). An abrupt warming of oceanic intermediate waters could have initiated the thermal destabilization of sediment-hosted methane gas hydrates and potentially triggered sediment slumps and slides. In an ensemble of fully coupled atmosphere-ocean general circulation model (AOGCM) simulations of the late Paleocene and early Eocene, we identify such a circulation-driven enhanced intermediate-water warming. Critically, we find an approximate twofold amplification of Atlantic intermediate-water warming when CO (sub 2) levels are doubled from 2x to 4x preindustrial CO (sub 2) compared to when they are doubled from 1x to 2x. This warming is largely focused on the equatorial and South Atlantic and is driven by a significant reduction in deep-water formation from the Southern Ocean. This scenario is consistent with altered PETM circulation patterns inferred from benthic carbon isotope data and the intensity of deep-sea carbonate dissolution in the South Atlantic. The linkage between intermediate-water warming and gas hydrate destabilization could provide an important feedback in the establishment of peak PETM warmth.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 38
Serial Issue: 10
Title: CO (sub 2) -driven ocean circulation changes as an amplifier of Paleocene-Eocene Thermal Maximum hydrate destabilization
Affiliation: University of Bristol, School of Geographical Science, Bristol, United Kingdom
Pages: 875-878
Published: 201010
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 30
Accession Number: 2010-090897
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010246
Illustration Description: illus.
Secondary Affiliation: University College London, GBR, United KingdomUniversity of Leeds, GBR, United KingdomUniversity of Southampton, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201048
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