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dc.contributor.authorLang, DC
dc.contributor.authorBailey, I
dc.contributor.authorWilson, PA
dc.contributor.authorChalk, TB
dc.contributor.authorFoster, GL
dc.contributor.authorGutjahr, M
dc.date.accessioned2016-07-18T11:38:00Z
dc.date.issued2016-04-04
dc.description.abstractThe circulation and internal structure of the oceans exert a strong influence on Earth’s climate because they control latitudinal heat transport and the segregation of carbon between the atmosphere and the abyss. Circulation change, particularly in the Atlantic Ocean, is widely suggested to have been instrumental in the intensification of northern hemisphere glaciation when large ice-sheets first developed on North America and Eurasia during the Late Pliocene, ~2.7 million years ago. Yet the mechanistic link and cause/effect relationship between ocean circulation and glaciation are debated. Here we present new records of North Atlantic Ocean structure using the carbon and neodymium isotopic composition of deep waters for both the Last Glacial to Holocene (35-5 thousand years ago) and the Late Pliocene to earliest Pleistocene (3.3 to 2.4 million years ago). Our data show no secular change. Instead we document major southern-sourced water incursions into the deep North Atlantic during prominent glacials from 2.7 million years ago. Our results suggest that Atlantic circulation acts as a positive feedback rather than as an underlying cause of Late Pliocene northern hemisphere glaciation. We propose that, once surface Southern Ocean stratification and/or extensive sea-ice cover was established, cold-stage expansions of southern-sourced water such as those documented here enhanced carbon dioxide storage in the deep ocean, helping to increase the amplitude of glacial cycles.en_GB
dc.description.sponsorshipThis research was supported by the Natural Environment Research Council (NERC) through a PhD studentship to D.C.L., a NERC UK IODP grant NE/F00141X/1 to P.A.W. and I.B., a Royal Society Wolfson Research Merit Award to P.A.W. and NERC grant NE/H006273/1 to G.L.F.en_GB
dc.identifier.citationVol 9, pp. 375–379en_GB
dc.identifier.doi10.1038/ngeo2688
dc.identifier.urihttp://hdl.handle.net/10871/22609
dc.language.isoenen_GB
dc.publisherNature Publishing Groupen_GB
dc.rights.embargoreasonPublisher policyen_GB
dc.subjectPalaeoceanographyen_GB
dc.subjectPalaeoclimateen_GB
dc.titleIncursions of southern-sourced water into the deep North Atlantic during Late Pliocene glacial intensificationen_GB
dc.typeArticleen_GB
dc.identifier.issn1752-0908
dc.descriptionThis is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.en_GB
dc.descriptionPublished Online 4th April 2016.en_GB
dc.identifier.journalNature Geoscienceen_GB


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