Age determination and age tie-points of sediment cores from the Timor Sea

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, form...

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Bibliographic Details
Main Authors: Kuhnt, Wolfgang, Holbourn, Ann E, Xu, Jian, Opdyke, Bradley N, De Deckker, Patrick, Röhl, Ursula, Mudelsee, Manfred
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2015
Subjects:
GIK/IfG
IMAGES
Institute for Geosciences
Christian Albrechts University
Kiel
International Marine Global Change Study
Antarc*
Antarctic
Antarctica
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.841351
https://doi.org/10.1594/PANGAEA.841351
Description
Summary: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.

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