TOUCANNE, Samuel; SOULET, Guillaume; VÁZQUEZ RIVEIROS, Natalia; BOSWELL, Steven; DENNIELOU, Bernard; WAELBROECK, Claire; BAYON, Germain; MOJTAHID, Meryem; BOSQ, Mathieu; SABINE, Marjolaine; ZARAGOSI, Sebastien; BOURILLET, Jean‐françois; MERCIER, Herlé

doi:10.1029/2020PA004068

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TOUCANNE, Samuel
Unité Géosciences Marines [GM]

SOULET, Guillaume

VÁZQUEZ RIVEIROS, Natalia

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Article de revue

Ce document a été publié dans

Paleoceanography and Paleoclimatology. 2021-03, vol. 36, n° 3

Résumé en anglais

The upper branch of the Atlantic meridional overturning circulation (AMOC) plays a critical role in ocean circulation and climate change, yet its variability during the last glacial period is poorly documented. Here, we investigate the northward-flowing Glacial Eastern Boundary Current (GEBC) in the North Atlantic, known today as the European Slope Current, and representing the easternmost portion of the upper branch of the AMOC. Based on flow speed and isotopic records, we show that Dansgaard-Oeschger (D-O) interstadials (stadials) correspond to a faster (weaker) GEBC during the ∼50–15 ka period. This, by analogy to present-day conditions, suggests enhanced (reduced) strength of the subpolar gyre and, by extension, of northern-sourced water production and AMOC during D-O interstadials (stadials). Concomitant fluctuations of both the GEBC and the European Ice Sheet between ∼30 and 17 ka suggest an active role of the upper branch of AMOC in the poleward transport of heat and freshwater to the northern North Atlantic, with direct impacts on deep water formation and AMOC strength. We explore these ice-sheet—AMOC interactions and the associated abrupt climate changes over the last glacial period and the last deglaciation.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/199989

DOI

http://dx.doi.org/10.1029/2020PA004068

Projet Européen

Elucidating the Causes and Effects of Atlantic Circulation Changes through Model-Data Integration

Project ANR

LabexMER Marine Excellence Research: a changing ocean
Tsunamis en Atlantique et MaNche : Définition des Effets par Modélisation - ANR-11-RSNR-0023

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805