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Surface ocean warming and acidification driven by rapid carbon release precedes Paleocene-Eocene Thermal Maximum

Surface ocean warming and acidification driven by rapid carbon release precedes Paleocene-Eocene Thermal Maximum
Surface ocean warming and acidification driven by rapid carbon release precedes Paleocene-Eocene Thermal Maximum
The Paleocene-Eocene Thermal Maximum (PETM) is recognized by a major negative carbon isotope (δ13C) excursion (CIE) signifying an injection of isotopically light carbon into exogenic reservoirs, the mass, source, and tempo of which continue to be debated. Evidence of a transient precursor carbon release(s) has been identified in a few localities, although it remains equivocal whether there is a global signal. Here, we present foraminiferal δ13C records from a marine continental margin section, which reveal a 1.0 to 1.5‰ negative pre-onset excursion (POE), and concomitant rise in sea surface temperature of at least 2°C and a decline in ocean pH. The recovery of both δ13C and pH before the CIE onset and apparent absence of a POE in deep-sea records suggests a rapid (< ocean mixing time scales) carbon release, followed by recovery driven by deep-sea mixing. Carbon released during the POE is therefore likely more similar to ongoing anthropogenic emissions in mass and rate than the main CIE.
2375-2548
Babila, Tali
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Penman, Donald
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Standish, Christopher
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Doubrawa, Monika
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Bralower, Timothy
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Robinson, Marci
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Self-Trail, Jean
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Speijer, Robert
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Strassen, Peter
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Foster, Gavin
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Zachos, James
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Babila, Tali
a59f9473-d145-4d43-92c0-ea682f29fdcc
Penman, Donald
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Standish, Christopher
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Doubrawa, Monika
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Bralower, Timothy
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Robinson, Marci
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Self-Trail, Jean
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Speijer, Robert
71552de9-c9e8-46e7-8068-5cd050d9a70c
Strassen, Peter
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Foster, Gavin
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Zachos, James
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Babila, Tali, Penman, Donald, Standish, Christopher, Doubrawa, Monika, Bralower, Timothy, Robinson, Marci, Self-Trail, Jean, Speijer, Robert, Strassen, Peter, Foster, Gavin and Zachos, James (2022) Surface ocean warming and acidification driven by rapid carbon release precedes Paleocene-Eocene Thermal Maximum. Science Advances, 8 (11), [abg1025]. (doi:10.1126/sciadv.abg1025).

Record type: Article

Abstract

The Paleocene-Eocene Thermal Maximum (PETM) is recognized by a major negative carbon isotope (δ13C) excursion (CIE) signifying an injection of isotopically light carbon into exogenic reservoirs, the mass, source, and tempo of which continue to be debated. Evidence of a transient precursor carbon release(s) has been identified in a few localities, although it remains equivocal whether there is a global signal. Here, we present foraminiferal δ13C records from a marine continental margin section, which reveal a 1.0 to 1.5‰ negative pre-onset excursion (POE), and concomitant rise in sea surface temperature of at least 2°C and a decline in ocean pH. The recovery of both δ13C and pH before the CIE onset and apparent absence of a POE in deep-sea records suggests a rapid (< ocean mixing time scales) carbon release, followed by recovery driven by deep-sea mixing. Carbon released during the POE is therefore likely more similar to ongoing anthropogenic emissions in mass and rate than the main CIE.

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Published date: 16 March 2022

Identifiers

Local EPrints ID: 457996
URI: http://eprints.soton.ac.uk/id/eprint/457996
ISSN: 2375-2548
PURE UUID: 0079a7f6-12b9-436b-89fd-33e28424d7f8
ORCID for Tali Babila: ORCID iD orcid.org/0000-0001-9948-9341
ORCID for Christopher Standish: ORCID iD orcid.org/0000-0002-9726-295X
ORCID for Gavin Foster: ORCID iD orcid.org/0000-0003-3688-9668

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Date deposited: 23 Jun 2022 18:29
Last modified: 23 Jul 2022 02:21

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Contributors

Author: Tali Babila ORCID iD
Author: Donald Penman
Author: Monika Doubrawa
Author: Timothy Bralower
Author: Marci Robinson
Author: Jean Self-Trail
Author: Robert Speijer
Author: Peter Strassen
Author: Gavin Foster ORCID iD
Author: James Zachos

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