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    Obliquity-driven expansion of North Atlantic sea ice during the last glacial

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    Date
    2015-12-10
    Author
    Turney, Christian S. M.  Concept link
    Thomas, Zoë  Concept link
    Hutchinson, David K.  Concept link
    Bradshaw, Corey J. A.  Concept link
    Brook, Barry W.  Concept link
    England, Matthew H.  Concept link
    Fogwill, Christopher J.  Concept link
    Jones, Richard T.  Concept link
    Palmer, Jonathan G.  Concept link
    Hughen, Konrad A.  Concept link
    Cooper, Alan  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7799
    As published
    https://doi.org/10.1002/2015GL066344
    DOI
    10.1002/2015GL066344
    Keyword
     Late Pleistocene; Abrupt climate change; Geochronology; Tipping point; Meridional overturning circulation; Greenland ice cores 
    Abstract
    North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 cal years ago (23 to 19 ka), no D-O events are observed in the Greenland ice cores. Our new analysis of the Greenland δ18O record reveals a switch in the stability of the climate system around 30 ka, suggesting that a critical threshold was passed. Climate system modeling suggests that low axial obliquity at this time caused vastly expanded sea ice in the Labrador Sea, shifting Northern Hemisphere westerly winds south and reducing the strength of meridional overturning circulation. The results suggest that these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM.
    Description
    Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 10,382–10,390, doi:10.1002/2015GL066344.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geophysical Research Letters 42 (2015): 10,382–10,390
     
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