Journal
SCIENCE
Volume 349, Issue 6255, Pages 1537-1541Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aac6159
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Funding
- European Research Council
- Philip Leverhulme Trust
- U.S. National Science Foundation [0636787, 0944474, 0902957, 1234664]
- Marie Curie Reintegration Grant
- Directorate For Geosciences
- Division Of Polar Programs [0902957, 0944474, 0636787] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1234664] Funding Source: National Science Foundation
- Natural Environment Research Council [NE/M004619/1] Funding Source: researchfish
- NERC [NE/M004619/1] Funding Source: UKRI
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Antarctic ice-core data reveal that the atmosphere experienced abrupt centennial increases in CO2 concentration during the last deglaciation (similar to 18 thousand to 11 thousand years ago). Establishing the role of ocean circulation in these changes requires high-resolution, accurately dated marine records. Here, we report radiocarbon data from uranium-thorium-dated deep-sea corals in the Equatorial Atlantic and Drake Passage over the past 25,000 years. Two major deglacial radiocarbon shifts occurred in phase with centennial atmospheric CO2 rises at 14.8 thousand and 11.7 thousand years ago. We interpret these radiocarbon-enriched signals to represent two short-lived (less than 500 years) overshoot events, with Atlantic meridional overturning stronger than that of the modern era. These results provide compelling evidence for a close coupling of ocean circulation and centennial climate events during the last deglaciation.
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