Interhemispheric Atlantic seesaw response during the last deglaciation

Stephen Barker (), Paula Diz, Maryline J. Vautravers, Jennifer Pike, Gregor Knorr, Ian R. Hall and Wallace S. Broecker
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Stephen Barker: School of Earth and Ocean Sciences, Cardiff University
Paula Diz: School of Earth and Ocean Sciences, Cardiff University
Maryline J. Vautravers: British Antarctic Survey
Jennifer Pike: School of Earth and Ocean Sciences, Cardiff University
Gregor Knorr: School of Earth and Ocean Sciences, Cardiff University
Ian R. Hall: School of Earth and Ocean Sciences, Cardiff University
Wallace S. Broecker: Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964-8000, USA

Nature, 2009, vol. 457, issue 7233, 1097-1102

Abstract: Abstract The asynchronous relationship between millennial-scale temperature changes over Greenland and Antarctica during the last glacial period has led to the notion of a bipolar seesaw which acts to redistribute heat depending on the state of meridional overturning circulation within the Atlantic Ocean. Here we present new records from the South Atlantic that show rapid changes during the last deglaciation that were instantaneous (within dating uncertainty) and of opposite sign to those observed in the North Atlantic. Our results demonstrate a direct link between the abrupt changes associated with variations in the Atlantic meridional overturning circulation and the more gradual adjustments characteristic of the Southern Ocean. These results emphasize the importance of the Southern Ocean for the development and transmission of millennial-scale climate variability and highlight its role in deglacial climate change and the associated rise in atmospheric carbon dioxide.

Date: 2009
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DOI: 10.1038/nature07770

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