Interglacial instability of North Atlantic Deep Water ventilation
|Author(s)||Galaasen Eirik Vinje1, Ninnemann Ulysses1, Kessler Augustin2, Irvali 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 : 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.
|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.