Rapid interhemispheric climate links via the Australasian monsoon during the last deglaciation

Linda K. Ayliffe, Michael K. Gagan (), Jian-xin Zhao, Russell N. Drysdale, John C. Hellstrom, Wahyoe S. Hantoro, Michael L. Griffiths, Heather Scott-Gagan, Emma St Pierre, Joan A. Cowley and Bambang W. Suwargadi
Additional contact information
Linda K. Ayliffe: Research School of Earth Sciences, The Australian National University
Michael K. Gagan: Research School of Earth Sciences, The Australian National University
Jian-xin Zhao: School of Earth Sciences, The University of Queensland
Russell N. Drysdale: The University of Melbourne
John C. Hellstrom: School of Earth Sciences, The University of Melbourne
Wahyoe S. Hantoro: Research Center for Geotechnology, Indonesian Institute of Sciences
Michael L. Griffiths: William Paterson University
Heather Scott-Gagan: Research School of Earth Sciences, The Australian National University
Emma St Pierre: School of Earth Sciences, The University of Queensland
Joan A. Cowley: Research School of Earth Sciences, The Australian National University
Bambang W. Suwargadi: Research Center for Geotechnology, Indonesian Institute of Sciences

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Recent studies have proposed that millennial-scale reorganization of the ocean-atmosphere circulation drives increased upwelling in the Southern Ocean, leading to rising atmospheric carbon dioxide levels and ice age terminations. Southward migration of the global monsoon is thought to link the hemispheres during deglaciation, but vital evidence from the southern sector of the vast Australasian monsoon system is yet to emerge. Here we present a 230thorium-dated stalagmite oxygen isotope record of millennial-scale changes in Australian–Indonesian monsoon rainfall over the last 31,000 years. The record shows that abrupt southward shifts of the Australian–Indonesian monsoon were synchronous with North Atlantic cold intervals 17,600–11,500 years ago. The most prominent southward shift occurred in lock-step with Heinrich Stadial 1 (17,600–14,600 years ago), and rising atmospheric carbon dioxide. Our findings show that millennial-scale climate change was transmitted rapidly across Australasia and lend support to the idea that the 3,000-year-long Heinrich 1 interval could have been critical in driving the last deglaciation.

Date: 2013
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DOI: 10.1038/ncomms3908

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