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      Synchronous centennial abrupt events in the ocean and atmosphere during the last deglaciation.

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          Abstract

          Antarctic ice-core data reveal that the atmosphere experienced abrupt centennial increases in CO2 concentration during the last deglaciation (~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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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          Sep 25 2015
          : 349
          : 6255
          Affiliations
          [1 ] Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol, UK. tc14502@bristol.ac.uk.
          [2 ] Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol, UK.
          [3 ] Department of Earth and Environmental Sciences, University of St Andrews, St. Andrews, UK.
          [4 ] School of Physical Sciences, University of California, Irvine, Irvine, CA, USA.
          Article
          349/6255/1537
          10.1126/science.aac6159
          26404835

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