Constraining the Variability of the Atlantic Meridional Overturning Circulation During the Holocene

Lippold, Jörg; Pöppelmeier, Frerk; Süfke, Finn; Gutjahr, Marcus; Goepfert, Tyler; Blaser, Patrick; Friedrich, Oliver; Link, Jasmin; Wacker, Lukas; Rheinberger, Stefan; Jaccard, Samuel (2019). Constraining the Variability of the Atlantic Meridional Overturning Circulation During the Holocene. Geophysical Research Letters, 46(20), pp. 11338-11346. American Geophysical Union 10.1029/2019GL084988

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There is a converging body of evidence supporting a measurable slowdown of the Atlantic Meridional Overturning Circulation (AMOC) as climate warms and Northern Hemisphere ice sheets inexorably shrink. Within this context, we assess the variability of the AMOC during the Holocene based on a marine sediment core retrieved from the deep northwest Atlantic, which sensitively recorded large‐scale deglacial transitions in deep water circulation. While there is a diffuse notion of Holocene variability in Labrador and Nordic Seas overturning, we report a largely invariable deep water circulation for the last ~11,000 years, even during the meltwater pulse associated with the 8.2‐ka event. Sensitivity tests along with high‐resolution 231Pa/230Th data constrain the duration and the magnitude of possible Holocene AMOC variations. The generally constant baseline during the Holocene suggests attenuated natural variability of the large‐scale AMOC on submillennial timescales and calls for compensating effects involving the upstream components of North Atlantic Deep Water.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Jaccard, Samuel

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0094-8276

Publisher:

American Geophysical Union

Language:

English

Submitter:

Samuel Jaccard

Date Deposited:

28 Nov 2019 10:12

Last Modified:

28 Nov 2019 10:12

Publisher DOI:

10.1029/2019GL084988

BORIS DOI:

10.7892/boris.135366

URI:

https://boris.unibe.ch/id/eprint/135366

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