Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments
Abstract The International Ocean Discovery Program (IODP) Expedition 356 Site U1461 cored a Miocene to Holocene sedimentary sequence in the upper bathyal carbonate offshore northwestern Australia (NWA). The siliciclastic component of these strata is primarily derived from the Australian continent. R...
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ftdoajarticles:oai:doaj.org/article:fc00e815cf344eabaaeca041f5ef515d 2023-05-15T18:01:00+02:00 Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments Takeshige Ishiwa Yusuke Yokoyama Lars Reuning Cecilia M. McHugh David De Vleeschouwer Stephen J. Gallagher 2019-02-01T00:00:00Z https://doi.org/10.1186/s40645-019-0262-5 https://doaj.org/article/fc00e815cf344eabaaeca041f5ef515d EN eng SpringerOpen http://link.springer.com/article/10.1186/s40645-019-0262-5 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-019-0262-5 2197-4284 https://doaj.org/article/fc00e815cf344eabaaeca041f5ef515d Progress in Earth and Planetary Science, Vol 6, Iss 1, Pp 1-10 (2019) International Ocean Discovery Program Expedition 356 Australian Summer Monsoon Radiocarbon dating Holocene climate variability Northwestern Australia Geography. Anthropology. Recreation G Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.1186/s40645-019-0262-5 2022-12-31T01:31:50Z Abstract The International Ocean Discovery Program (IODP) Expedition 356 Site U1461 cored a Miocene to Holocene sedimentary sequence in the upper bathyal carbonate offshore northwestern Australia (NWA). The siliciclastic component of these strata is primarily derived from the Australian continent. Radiocarbon dating on macrofossils and planktonic foraminifera shows that the upper 14 m section at Site U1461 preserves Holocene sediments, recording regional climate variability. K/Ca ratios determined by X-ray fluorescence elemental analyses and %K determined by shipboard natural gamma ray analysis are interpreted as indicators of riverine run-off from the Australian continent. We document the consequences of the variability of the Australian Summer Monsoon (ASM) on the continental shelf of NWA. We report an increase in terrigenous input due to a riverine run-off after 11.5 ka, which reaches a maximum at ~ 8.5 ka. This maximum is the result of the enhanced ASM-derived precipitation in response to the southern migration of the Intertropical Convergence Zone (ITCZ). A decrease in riverine run-off due to a weakening of precipitation in the NWA region after 8.5 ka was caused by the northern migration of the ITCZ. We conclude that the ITCZ reached its southernmost position at 8.5 ka and enhanced precipitation in the NWA region. This Holocene record shows that even during interglacial periods, monsoonal variability was primarily controlled by the position of the ITCZ. Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Progress in Earth and Planetary Science 6 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
International Ocean Discovery Program Expedition 356 Australian Summer Monsoon Radiocarbon dating Holocene climate variability Northwestern Australia Geography. Anthropology. Recreation G Geology QE1-996.5 |
spellingShingle |
International Ocean Discovery Program Expedition 356 Australian Summer Monsoon Radiocarbon dating Holocene climate variability Northwestern Australia Geography. Anthropology. Recreation G Geology QE1-996.5 Takeshige Ishiwa Yusuke Yokoyama Lars Reuning Cecilia M. McHugh David De Vleeschouwer Stephen J. Gallagher Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments |
topic_facet |
International Ocean Discovery Program Expedition 356 Australian Summer Monsoon Radiocarbon dating Holocene climate variability Northwestern Australia Geography. Anthropology. Recreation G Geology QE1-996.5 |
description |
Abstract The International Ocean Discovery Program (IODP) Expedition 356 Site U1461 cored a Miocene to Holocene sedimentary sequence in the upper bathyal carbonate offshore northwestern Australia (NWA). The siliciclastic component of these strata is primarily derived from the Australian continent. Radiocarbon dating on macrofossils and planktonic foraminifera shows that the upper 14 m section at Site U1461 preserves Holocene sediments, recording regional climate variability. K/Ca ratios determined by X-ray fluorescence elemental analyses and %K determined by shipboard natural gamma ray analysis are interpreted as indicators of riverine run-off from the Australian continent. We document the consequences of the variability of the Australian Summer Monsoon (ASM) on the continental shelf of NWA. We report an increase in terrigenous input due to a riverine run-off after 11.5 ka, which reaches a maximum at ~ 8.5 ka. This maximum is the result of the enhanced ASM-derived precipitation in response to the southern migration of the Intertropical Convergence Zone (ITCZ). A decrease in riverine run-off due to a weakening of precipitation in the NWA region after 8.5 ka was caused by the northern migration of the ITCZ. We conclude that the ITCZ reached its southernmost position at 8.5 ka and enhanced precipitation in the NWA region. This Holocene record shows that even during interglacial periods, monsoonal variability was primarily controlled by the position of the ITCZ. |
format |
Article in Journal/Newspaper |
author |
Takeshige Ishiwa Yusuke Yokoyama Lars Reuning Cecilia M. McHugh David De Vleeschouwer Stephen J. Gallagher |
author_facet |
Takeshige Ishiwa Yusuke Yokoyama Lars Reuning Cecilia M. McHugh David De Vleeschouwer Stephen J. Gallagher |
author_sort |
Takeshige Ishiwa |
title |
Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments |
title_short |
Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments |
title_full |
Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments |
title_fullStr |
Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments |
title_full_unstemmed |
Australian Summer Monsoon variability in the past 14,000 years revealed by IODP Expedition 356 sediments |
title_sort |
australian summer monsoon variability in the past 14,000 years revealed by iodp expedition 356 sediments |
publisher |
SpringerOpen |
publishDate |
2019 |
url |
https://doi.org/10.1186/s40645-019-0262-5 https://doaj.org/article/fc00e815cf344eabaaeca041f5ef515d |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Progress in Earth and Planetary Science, Vol 6, Iss 1, Pp 1-10 (2019) |
op_relation |
http://link.springer.com/article/10.1186/s40645-019-0262-5 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-019-0262-5 2197-4284 https://doaj.org/article/fc00e815cf344eabaaeca041f5ef515d |
op_doi |
https://doi.org/10.1186/s40645-019-0262-5 |
container_title |
Progress in Earth and Planetary Science |
container_volume |
6 |
container_issue |
1 |
_version_ |
1766170301723312128 |