Interglacial instability of North Atlantic Deep Water ventilation

Type Article
Date 2020-03
Language English
Author(s) Galaasen Eirik Vinje1, Ninnemann Ulysses S.1, Kessler Augustin2, Irvalı Nil1, Rosenthal Yair3, Tjiputra Jerry2, Bouttes Nathaëlle4, Roche Didier M.4, 5, Kleiven Helga (kikki) F.1, Hodell David A.6
Affiliation(s) 1 : Department of Earth Science and Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway.
2 : NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway.
3 : Institute of Marine and Coastal Sciences and Department of Earth and Planetary Sciences, Rutgers University, New Brunswick, NJ, USA.
4 : Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France.
5 : Earth and Climate Cluster, Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands.
6 : Godwin Laboratory for Paleoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, UK.
Source Science (0036-8075) (American Association for the Advancement of Science (AAAS)), 2020-03 , Vol. 367 , N. 6485 , P. 1485-1489
DOI 10.1126/science.aay6381
WOS© Times Cited 10
Abstract

Disrupting North Atlantic Deep Water (NADW) ventilation is a key concern in climate projections. We use (sub)centennially resolved bottom water δ13C records that span the interglacials of the last 0.5 million years to assess the frequency of and the climatic backgrounds capable of triggering large NADW reductions. Episodes of reduced NADW in the deep Atlantic, similar in magnitude to glacial events, have been relatively common and occasionally long-lasting features of interglacials. NADW reductions were triggered across the range of recent interglacial climate backgrounds, which demonstrates that catastrophic freshwater outburst floods were not a prerequisite for large perturbations. Our results argue that large NADW disruptions are more easily achieved than previously appreciated and that they occurred in past climate conditions similar to those we may soon face.

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Materials/Methods, Supplementary Text, Tables, Figures, and/or References 20 6 MB Open access
Data S1 The appended data file [Data S1_Eirik-Drift_MIS-7e-9e-11c.xlsx] includes: the IODP Site U1305 benthic foraminifera C. wuellerstorfi stable isotope data for MIS 7e, 9e, and 11c; the IODP... 131 KB Open access
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Galaasen Eirik Vinje, Ninnemann Ulysses S., Kessler Augustin, Irvalı Nil, Rosenthal Yair, Tjiputra Jerry, Bouttes Nathaëlle, Roche Didier M., Kleiven Helga (kikki) F., Hodell David A. (2020). Interglacial instability of North Atlantic Deep Water ventilation. Science, 367(6485), 1485-1489. Publisher's official version : https://doi.org/10.1126/science.aay6381 , Open Access version : https://archimer.ifremer.fr/doc/00663/77524/