Southern Hemisphere control on Australian monsoon variability during the late deglaciation and Holocene

Wolfgang Kuhnt (), Ann Holbourn, Jian Xu, Bradley Opdyke, Patrick De Deckker, Ursula Röhl and Manfred Mudelsee
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Wolfgang Kuhnt: Institute of Geosciences, Christian-Albrechts-University
Ann Holbourn: Institute of Geosciences, Christian-Albrechts-University
Jian Xu: Northwest University
Bradley Opdyke: Research School of Earth Sciences, The Australian National University
Patrick De Deckker: Research School of Earth Sciences, The Australian National University
Ursula Röhl: MARUM—Zentrum für Marine Umweltwissenschaften, Universität Bremen
Manfred Mudelsee: Climate Risk Analysis

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract The evolution of the Australian monsoon in relation to high-latitude temperature fluctuations over the last termination remains highly enigmatic. Here we integrate high-resolution riverine runoff and dust proxy data from X-ray fluorescence scanner measurements in four well-dated sediment cores, forming a NE–SW transect across the Timor Sea. Our records reveal that the development of the Australian monsoon closely followed the deglacial warming history of Antarctica. A minimum in riverine runoff documents dry conditions throughout the region during the Antarctic Cold Reversal (15–12.9 ka). Massive intensification of the monsoon coincided with Southern Hemisphere warming and intensified greenhouse forcing over Australia during the atmospheric CO2 rise at 12.9–10 ka. We relate the earlier onset of the monsoon in the Timor Strait (13.4 ka) to regional changes in landmass exposure during deglacial sea-level rise. A return to dryer conditions occurred between 8.1 and 7.3 ka following the early Holocene runoff maximum.

Date: 2015
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DOI: 10.1038/ncomms6916

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