Southern Hemisphere control on Australian monsoon variability during the late deglaciation and Holocene
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...
| Published in: | Nature Communications |
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| Main Authors: | , , , , , , |
| Format: | Text |
| Language: | English |
| Published: |
Nature Publishing Group
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| Subjects: | |
| Online Access: | https://doi.org/10.1038/ncomms6916 https://archimer.ifremer.fr/doc/00352/46296/45939.pdf https://archimer.ifremer.fr/doc/00352/46296/45940.pdf https://archimer.ifremer.fr/doc/00352/46296/ |
| 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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