Journal
SCIENCE
Volume 353, Issue 6298, Pages 470-474Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf5529
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Funding
- NSF Graduate Research Fellowship
- Comer Science and Education Foundation
- NSF [ATM-0936496, ATM-0836472, AGS-1548160]
- LDEO Climate Center
- NERC [NE/K005235/1, NE/F006047/1] Funding Source: UKRI
- Natural Environment Research Council [NE/K005235/1, NE/F006047/1] Funding Source: researchfish
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The most recent ice age was characterized by rapid and hemispherically asynchronous climate oscillations, whose origin remains unresolved. Variations in oceanic meridional heat transport may contribute to these repeated climate changes, which were most pronounced during marine isotope stage 3, the glacial interval 25 thousand to 60 thousand years ago. We examined climate and ocean circulation proxies throughout this interval at high resolution in a deep North Atlantic sediment core, combining the kinematic tracer protactinium/thorium (Pa/Th) with the deep water-mass tracer, epibenthic delta C-13. These indicators suggest reduced Atlantic overturning circulation during every cool northern stadial, with the greatest reductions during episodic Hudson Strait iceberg discharges, while sharp northern warming followed reinvigorated overturning. These results provide direct evidence for the ocean's persistent, central role in abrupt glacial climate change.
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