Interglacial instability of North Atlantic Deep Water ventilation

Date 2020-03-27
Author(s) Galaasen Eirik VinjeORCID1, Ninnemann UlyssesORCID1, Kessler AugustinORCID2, Irvali NilORCID1, Rosenthal Yair3, Tjiputra JerryORCID2, Bouttes NathaëlleORCID4, Roche Didier M.ORCID4, 5, Kleiven Helga (kikki) F.ORCID1, Hodell David A.ORCID6
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 : Vrije Universiteit Amsterdam, Faculty of Science, Cluster Earth and Climate, Amsterdam, The Netherlands.
6 : Godwin Laboratory for Paleoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, UK.
DOI 10.17882/77657
Publisher SEANOE
Keyword(s) paleoceanography, NADW, AMOC, interglacial, North Atlantic, Eirik Drift

Disrupting North Atlantic Deep Water (NADW) ventilation is a key concern in climate projections. We use (sub)centennially resolved bottom water d13C 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.

Licence CC-BY
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Galaasen et al. (2020) supplementary data. 181 KB XLS, XLSX Processed data Open access
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Galaasen Eirik Vinje, Ninnemann Ulysses, Kessler Augustin, Irvali 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. SEANOE.