Progressive shoaling of the equatorial Pacific thermocline over the last eight glacial periods

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dc.citation.firstpage439en_US
dc.citation.issueNumber5en_US
dc.citation.journalTitlePaleoceanographyen_US
dc.citation.lastpage455en_US
dc.citation.volumeNumber30en_US
dc.contributor.authorRegoli, Fabienneen_US
dc.contributor.authorde Garidel-Thoron, Thibaulten_US
dc.contributor.authorTachikawa, Kazuyoen_US
dc.contributor.authorJian, Zhimingen_US
dc.contributor.authorYe, Limingen_US
dc.contributor.authorDroxler, André W.en_US
dc.contributor.authorLenoir, Guillaumeen_US
dc.contributor.authorCrucifix, Michelen_US
dc.contributor.authorBarbarin, Nicolasen_US
dc.contributor.authorBeaufort, Lucen_US
dc.date.accessioned2015-07-09T15:30:05Zen_US
dc.date.available2015-07-09T15:30:05Zen_US
dc.date.issued2015en_US
dc.description.abstractThe depth of equatorial Pacific thermocline is diagnostic of the main modes of tropical climates. Past estimates of Pacific thermocline dynamics have been reconstructed either for the Last Glacial Maximum or on longer timescales at low resolution. Here we document a new high-resolution set of reconstructed past sea surface and subsurface waters temperatures from the southwestern subequatorial Pacific, core MD05-2930, in the Gulf of Papua, over the last 800 ka. We used two morphotypes of Globigerinoides ruber known to live at different water depths to reconstruct past stratification. We estimated calcification temperature of each morphotypes by Mg/Ca paleothermometry. Our subequatorial Pacific thermocline paleotemperature record indicates a response of the thermocline to both direct orbital forcing and glacial-interglacial changes. Our stratification record shows a systematic shallower glacial thermocline, whereas sea surface temperatures are characterized by precessional forcing. The record is indicative of a progressive long-term shoaling of the thermocline during the glacial stages during the late Pleistocene. The shoaling of the subequatorial Pacific thermocline is consistent with regional estimates. An enhanced South Pacific shallow overturning wind-driven circulation could have driven this progressive shoaling. We speculate that this late Pleistocene glacial shoaling of the thermocline could be related to an increase in the amplitude of the obliquity.en_US
dc.identifier.citationRegoli, Fabienne, de Garidel-Thoron, Thibault, Tachikawa, Kazuyo, et al.. "Progressive shoaling of the equatorial Pacific thermocline over the last eight glacial periods." <i>Paleoceanography,</i> 30, no. 5 (2015) Wiley: 439-455. http://dx.doi.org/10.1002/2014PA002696.en_US
dc.identifier.doihttp://dx.doi.org/10.1002/2014PA002696en_US
dc.identifier.urihttps://hdl.handle.net/1911/80858en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.subject.keywordequatorial Pacificen_US
dc.subject.keywordthermoclineen_US
dc.subject.keywordPleistoceneen_US
dc.titleProgressive shoaling of the equatorial Pacific thermocline over the last eight glacial periodsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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