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

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Regoli, Fabienne de Garidel-Thoron, Thibault Tachikawa, Kazuyo Jian, Zhiming Ye, Liming Crucifix, Michel [UCL] Beaufort, Luc

The 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.

Type de document Article de périodique (Journal article) – Article de recherche
Type d'accès Accès libre
Année de publication 2015
Langue Anglais
Information sur le périodique "Paleoceanography" - Vol. 30, no.5, p. 439-455 (2015)
Peer reviewed oui
Editeur Wiley-Blackwell Publishing, Inc. ((United States) Hoboken)
issn 0883-8305
e-issn 1944-9186
Statut de la publication Publié
Affiliations UCL - SST/ELI/ELIC - Earth & Climate
Mots-clés 1443
Liens
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Référence bibliographique Regoli, Fabienne ; de Garidel-Thoron, Thibault ; Tachikawa, Kazuyo ; Jian, Zhiming ; Ye, Liming ; et. al. Progressive shoaling of the equatorial Pacific thermocline over the last eight glacial periods. In: Paleoceanography, Vol. 30, no.5, p. 439-455 (2015)
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