The North Atlantic Glacial Eastern Boundary Current as a Key Driver for Ice-Sheet-AMOC Interactions and Climate Instability

被引：30

作者：

Toucanne, Samuel ^{[1
]}

Soulet, Guillaume ^{[1
]}

Vazquez Riveiros, Natalia ^{[1
]}

Boswell, Steven M. ^{[2
]}

Dennielou, Bernard ^{[1
]}

Waelbroeck, Claire ^{[3
]}

Bayon, Germain ^{[1
]}

Mojtahid, Meryem ^{[4
]}

Bosq, Mathieu ^{[5
]}

Sabine, Marjolaine ^{[6
]}

Zaragosi, Sebastien ^{[6
]}

Bourillet, Jean-Francois ^{[1
]}

Mercier, Herle ^{[7
]}

机构：

[1] IFREMER, Unite Rech Geosci Marines, Lab Geophys & Enregistrement Sedimentaire, Plouzane, France

[2] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA

[3] Sorbonne Univ CNRS IRD MNHN, UMR7159, Lab Oceanog & Climat Expt & Approches Numer, LOCEAN IPSL, Paris, France

[4] Univ Angers, LPG BIAF UMR CNRS 6112, UFR Sci, Angers, France

[5] UMR 5199 CNRS Univ Bordeaux, PACEA, Pessac, France

[6] Univ Bordeaux, UMR CNRS 5805 EPOC OASU, Pessac, France

[7] Univ Brest, CNRS, IFREMER, IRD,Lab Oceanog Phys & Spatiale LOPS,Ctr IFREMER, Plouzane, France

来源：

PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY | 2021年 / 36卷 / 03期

基金：

欧洲研究理事会;

关键词：

AMOC; climate changes; Dansgaard‐ Oeschger events; Glacial Eastern Boundary Current; last glacial period; MERIDIONAL OVERTURNING CIRCULATION; MILLENNIAL-SCALE CHANGES; EUROPEAN SLOPE CURRENT; FRESH-WATER INPUT; DEEP-WATER; OCEAN CIRCULATION; SEA-ICE; HEINRICH EVENTS; MEDITERRANEAN OUTFLOW; RAPID CHANGES;

D O I：

10.1029/2020PA004068

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 similar to 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 similar to 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.

引用

页数：23

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