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Publication - Dr Hong Chin Ng

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

    Citation

    Chen, T, Robinson, LF, Burke, A, Southon, J, Spooner, P, Morris, PJ & Ng, HC, 2015, ‘Synchronous centennial abrupt events in the ocean and atmosphere during the last deglaciation’. Science, vol 349., pp. 1537-1541

    Abstract

    Antarctic ice-core data reveal that the atmosphere experienced abrupt centennial increases in CO<inf>2</inf> concentration during the last deglaciation (∼18 thousand to 11 thousand years ago). Establishing the role of ocean circulation in these changes requires highresolution, 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 CO<inf>2</inf> 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.

    Full details in the University publications repository