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Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study

Menviel, L; Yu, Jimin; Joos, F.; Mouchet, A.T.; Meissner, KA; England, Matthew Heathcote

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Atmospheric CO2 was โˆผ90 ppmv lower at the Last Glacial Maximum (LGM) compared to the late Holocene, but the mechanisms responsible for this change remain elusive. Here we employ a carbon isotope-enabled Earth System Model to investigate the role of ocean circulation in setting the LGM oceanic ๐›ฟ13C distribution, thereby improving our understanding of glacial/interglacial atmospheric CO2 variations. We find that the mean ocean ๐›ฟ13C change can be explained by a 378 ยฑ 88 Gt C (2๐œŽ) smaller LGM...[Show more]

dc.contributor.authorMenviel, L
dc.contributor.authorYu, Jimin
dc.contributor.authorJoos, F.
dc.contributor.authorMouchet, A.T.
dc.contributor.authorMeissner, KA
dc.contributor.authorEngland, Matthew Heathcote
dc.date.accessioned2021-09-01T23:05:18Z
dc.date.available2021-09-01T23:05:18Z
dc.identifier.issn0883-8305
dc.identifier.urihttp://hdl.handle.net/1885/247315
dc.description.abstractAtmospheric CO2 was โˆผ90 ppmv lower at the Last Glacial Maximum (LGM) compared to the late Holocene, but the mechanisms responsible for this change remain elusive. Here we employ a carbon isotope-enabled Earth System Model to investigate the role of ocean circulation in setting the LGM oceanic ๐›ฟ13C distribution, thereby improving our understanding of glacial/interglacial atmospheric CO2 variations. We find that the mean ocean ๐›ฟ13C change can be explained by a 378 ยฑ 88 Gt C (2๐œŽ) smaller LGM terrestrial carbon reservoir compared to the Holocene. Critically, in this model, differences in the oceanic ๐›ฟ13C spatial pattern can only be reconciled with a LGM ocean circulation state characterized by a weak (10โ€“15 Sv) and relatively shallow (2000โ€“2500 m) North Atlantic Deep Water cell, reduced Antarctic Bottom Water transport (โ‰ค10 Sv globally integrated), and relatively weak (6โ€“8 Sv) and shallow (1000โ€“1500 m) North Pacific Intermediate Water formation. This oceanic circulation state is corroborated by results from the isotope-enabled Bern3D ocean model and further confirmed by high LGM ventilation ages in the deep ocean, particularly in the deep South Atlantic and South Pacific. This suggests a poorly ventilated glacial deep ocean which would have facilitated the sequestration of carbon lost from the terrestrial biosphere and atmosphere.
dc.description.sponsorshipThis project was supported by the Australian Research Council. L. Menviel, and M. England acknowledge funding from the Australian Research Council grants DE150100107 and FL100100214, respectively. J. Yu acknowledges funding from the Australian Research Council grants FT140100993, DP140101393, K. Meissner acknowledges support from a UNSW Faculty of Science Silverstar award. F.J. acknowledges funding by the Swiss National Science Foundation.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherAmerican Geophysical Union
dc.rightsยฉ2016. American Geophysical Union
dc.sourcePaleoceanography
dc.titlePoorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume32
dc.date.issued2017
local.identifier.absfor040200 - GEOCHEMISTRY
local.identifier.ariespublicationu4485658xPUB58
local.publisher.urlhttps://www.wiley.com/en-gb
local.type.statusPublished Version
local.contributor.affiliationMenviel, L, University of New South Wales
local.contributor.affiliationYu, Jimin, College of Science, ANU
local.contributor.affiliationJoos, F., University of Bern
local.contributor.affiliationMouchet, A.T., Laboratoire des Sciences du Climat et de lโ€™Environnement
local.contributor.affiliationMeissner, KA, University of New South Wales
local.contributor.affiliationEngland, Matthew Heathcote, University of New South Wales
dc.relationhttp://purl.org/au-research/grants/arc/DE150100107
dc.relationhttp://purl.org/au-research/grants/arc/FL100100214
dc.relationhttp://purl.org/au-research/grants/arc/FT140100993
dc.relationhttp://purl.org/au-research/grants/arc/DP140101393
local.bibliographicCitation.issue1
local.identifier.doi10.1002/2016PA003024
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2020-11-23T10:57:27Z
local.identifier.scopusID2-s2.0-85007490640
local.identifier.thomsonID000394989300001
dcterms.accessRightsOpen Access
dc.provenance..."published version can be made open access in institutional repository" from SHERPA/RoMEO site (as at 2/09/21).
CollectionsANU Research Publications

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