Journal
SCIENCE
Volume 343, Issue 6175, Pages 1129-1132Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1248667
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Funding
- Meltzer Fund (University of Bergen)
- North Atlantic Ocean-Climate Variability in a Warmer World (NOCWARM) project (Research Council of Norway)
- NERC [NE/H014292/1] Funding Source: UKRI
- Natural Environment Research Council [NE/H014292/1] Funding Source: researchfish
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Deep ocean circulation has been considered relatively stable during interglacial periods, yet little is known about its behavior on submillennial time scales. Using a subcentennially resolved epibenthic foraminiferal delta C-13 record, we show that the influence of North Atlantic Deep Water (NADW) was strong at the onset of the last interglacial period and was then interrupted by several prominent centennial-scale reductions. These NADW transients occurred during periods of increased ice rafting and southward expansions of polar water influence, suggesting that a buoyancy threshold for convective instability was triggered by freshwater and circum-Arctic cryosphere changes. The deep Atlantic chemical changes were similar in magnitude to those associated with glaciations, implying that the canonical view of a relatively stable interglacial circulation may not hold for conditions warmer and fresher than at present.
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