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    North Atlantic ocean circulation and abrupt climate change during the last glaciation

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    Revised Science Paper.pdf (300.8Kb)
    Date
    2016-05-21
    Author
    Henry, L. Gene  Concept link
    McManus, Jerry F.  Concept link
    Curry, William B.  Concept link
    Roberts, Natalie L.  Concept link
    Piotrowski, Alexander M.  Concept link
    Keigwin, Lloyd D.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8240
    As published
    https://doi.org/10.1126/science.aaf5529
    Abstract
    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 the glacial interval twenty-five to sixty thousand years ago known as marine isotope stage 3 (MIS3). Here we examine a sequence of climate and ocean circulation proxies throughout MIS3 at high resolution in a deep North Atlantic sediment core, combining the kinematic tracer Pa/Th with the most widely applied deep water-mass tracer, δ13CBF. These indicators reveal that Atlantic overturning circulation was reduced during every cool northern stadial, with the greatest reductions during episodic iceberg discharges from the Hudson Strait, and that sharp northern warming followed reinvigorated overturning. These results provide direct evidence for the ocean's persistent, central role in abrupt glacial climate change.
    Description
    Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of American Association for the Advancement of Science for personal use, not for redistribution. The definitive version was published in Science 353 (2016): 470-474, doi:10.1126/science.aaf5529.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Henry, L. Gene, McManus, Jerry F., Curry, William B., Roberts, Natalie L., Piotrowski, Alexander M., Keigwin, Lloyd D., "North Atlantic ocean circulation and abrupt climate change during the last glaciation", 2016-05-21, https://doi.org/10.1126/science.aaf5529, https://hdl.handle.net/1912/8240
     
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