Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum

Abstract The Last Glacial Maximum (LGM, 23–19,000 year BP) designates a period of extensive glacial extent and very cold conditions on the Northern Hemisphere. The strength of ocean circulation during this period has been highly debated. Based on investigations of two marine sediment cores from the...

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Autores principales:	Marit-Solveig Seidenkrantz, Antoon Kuijpers, Steffen Aagaard-Sørensen, Holger Lindgreen, Jesper Olsen, Christof Pearce
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/987d5132d86f4a4eb951c9a1a7b4b410
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spelling	oai:doaj.org-article:987d5132d86f4a4eb951c9a1a7b4b4102021-12-02T13:24:25ZEvidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum10.1038/s41598-021-86224-z2045-2322https://doaj.org/article/987d5132d86f4a4eb951c9a1a7b4b4102021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86224-zhttps://doaj.org/toc/2045-2322Abstract The Last Glacial Maximum (LGM, 23–19,000 year BP) designates a period of extensive glacial extent and very cold conditions on the Northern Hemisphere. The strength of ocean circulation during this period has been highly debated. Based on investigations of two marine sediment cores from the Davis Strait (1033 m water depth) and the northern Labrador Sea (2381 m), we demonstrate a significant influx of Atlantic-sourced water at both subsurface and intermediate depths during the LGM. Although surface-water conditions were cold and sea-ice loaded, the lower strata of the (proto) West Greenland Current carried a significant Atlantic (Irminger Sea-derived) Water signal, while at the deeper site the sea floor was swept by a water mass comparable with present Northeast Atlantic Deep Water. The persistent influx of these Atlantic-sourced waters entrained by boundary currents off SW Greenland demonstrates an active Atlantic Meridional Overturning Circulation during the LGM. Immediately after the LGM, deglaciation was characterized by a prominent deep-water ventilation event and potentially Labrador Sea Water formation, presumably related to brine formation and/or hyperpycnal meltwater flows. This was followed by a major re-arrangement of deep-water masses most likely linked to increased overflow at the Greenland-Scotland Ridge after ca 15 kyr BP.Marit-Solveig SeidenkrantzAntoon KuijpersSteffen Aagaard-SørensenHolger LindgreenJesper OlsenChristof PearceNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marit-Solveig Seidenkrantz Antoon Kuijpers Steffen Aagaard-Sørensen Holger Lindgreen Jesper Olsen Christof Pearce Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum
description	Abstract The Last Glacial Maximum (LGM, 23–19,000 year BP) designates a period of extensive glacial extent and very cold conditions on the Northern Hemisphere. The strength of ocean circulation during this period has been highly debated. Based on investigations of two marine sediment cores from the Davis Strait (1033 m water depth) and the northern Labrador Sea (2381 m), we demonstrate a significant influx of Atlantic-sourced water at both subsurface and intermediate depths during the LGM. Although surface-water conditions were cold and sea-ice loaded, the lower strata of the (proto) West Greenland Current carried a significant Atlantic (Irminger Sea-derived) Water signal, while at the deeper site the sea floor was swept by a water mass comparable with present Northeast Atlantic Deep Water. The persistent influx of these Atlantic-sourced waters entrained by boundary currents off SW Greenland demonstrates an active Atlantic Meridional Overturning Circulation during the LGM. Immediately after the LGM, deglaciation was characterized by a prominent deep-water ventilation event and potentially Labrador Sea Water formation, presumably related to brine formation and/or hyperpycnal meltwater flows. This was followed by a major re-arrangement of deep-water masses most likely linked to increased overflow at the Greenland-Scotland Ridge after ca 15 kyr BP.
format	article
author	Marit-Solveig Seidenkrantz Antoon Kuijpers Steffen Aagaard-Sørensen Holger Lindgreen Jesper Olsen Christof Pearce
author_facet	Marit-Solveig Seidenkrantz Antoon Kuijpers Steffen Aagaard-Sørensen Holger Lindgreen Jesper Olsen Christof Pearce
author_sort	Marit-Solveig Seidenkrantz
title	Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum
title_short	Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum
title_full	Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum
title_fullStr	Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum
title_full_unstemmed	Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum
title_sort	evidence for influx of atlantic water masses to the labrador sea during the last glacial maximum
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/987d5132d86f4a4eb951c9a1a7b4b410
work_keys_str_mv	AT maritsolveigseidenkrantz evidenceforinfluxofatlanticwatermassestothelabradorseaduringthelastglacialmaximum AT antoonkuijpers evidenceforinfluxofatlanticwatermassestothelabradorseaduringthelastglacialmaximum AT steffenaagaardsørensen evidenceforinfluxofatlanticwatermassestothelabradorseaduringthelastglacialmaximum AT holgerlindgreen evidenceforinfluxofatlanticwatermassestothelabradorseaduringthelastglacialmaximum AT jesperolsen evidenceforinfluxofatlanticwatermassestothelabradorseaduringthelastglacialmaximum AT christofpearce evidenceforinfluxofatlanticwatermassestothelabradorseaduringthelastglacialmaximum
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Evidence for influx of Atlantic water masses to the Labrador Sea during the Last Glacial Maximum

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