Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia
Abrupt changes in Atlantic Meridional Overturning Circulation are known to have affected the strength of the Indian and Asian Monsoons during glacial and deglacial climate states. However, there is still much uncertainty around the hydroclimate response of the Indo-Pacific Warm Pool (IPWP) region to...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/257115 2024-01-14T10:08:54+01:00 Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia Wurtzel, Jennifer Abram, Nerilie Lewis, Sophie Bajo, Petra Hellstrom, John Charles Troitzsch, Ulrike Heslop, David application/pdf http://hdl.handle.net/1885/257115 https://doi.org/10.1016/j.epsl.2018.04.001 https://openresearch-repository.anu.edu.au/bitstream/1885/257115/3/01_Wurtzel_Tropical_Indo-Pacific_2018.pdf.jpg en_AU eng Elsevier http://purl.org/au-research/grants/arc/DP110101161 http://purl.org/au-research/grants/arc/DP140102059 http://purl.org/au-research/grants/arc/CE110001028 http://purl.org/au-research/grants/arc/160100092 http://purl.org/au-research/grants/arc/FT130100801 0012-821X http://hdl.handle.net/1885/257115 doi:10.1016/j.epsl.2018.04.001 https://openresearch-repository.anu.edu.au/bitstream/1885/257115/3/01_Wurtzel_Tropical_Indo-Pacific_2018.pdf.jpg © 2018 The Authors Earth and Planetary Science Letters speleothem oxygen isotopes Indo-Pacific Younger Dryas ITCZ deglaciation Journal article ftanucanberra https://doi.org/10.1016/j.epsl.2018.04.001 2023-12-15T09:33:55Z Abrupt changes in Atlantic Meridional Overturning Circulation are known to have affected the strength of the Indian and Asian Monsoons during glacial and deglacial climate states. However, there is still much uncertainty around the hydroclimate response of the Indo-Pacific Warm Pool (IPWP) region to abrupt climate changes in the North Atlantic. Many studies suggest a mean southward shift in the intertropical convergence zone (ITCZ) in the IPWP region during phases of reduced Atlantic meridional overturning, however, existing proxies have seasonal biases and conflicting responses, making it difficult to determine the true extent of North Atlantic forcing in this climatically important region. Here we present a precisely-dated, high-resolution record of eastern Indian Ocean hydroclimate variability spanning the last 16 ky (thousand years) from O measurements in an aragonite–calcite speleothem from central Sumatra. This represents the western-most speleothem record from the IPWP region. Precipitation arrives year-round at this site, with the majority sourced from the local tropical eastern Indian Ocean and two additional long-range seasonal sources associated with the boreal and austral summer monsoons. The Sumatran speleothem demonstrates a clear deglacial structure that includes 18O enrichment during the Younger Dryas and 18O depletion during the Bølling–Allerød, similar to the pattern seen in speleothems of the Asian and Indian monsoon realms. The speleothem O changes at this site are best explained by changes in rainfall amount and changes in the contributions from different moisture pathways. Reduced rainfall in Sumatra during the Younger Dryas is most likely driven by reductions in moisture transport along the northern or southern monsoon transport pathways to Sumatra. Considered with other regional proxies, the record from Sumatra suggests the response of the IPWP to North Atlantic freshwater forcing is not solely driven by southward shifts of the ITCZ, but also a reduction in moisture transport along both ... Article in Journal/Newspaper North Atlantic Australian National University: ANU Digital Collections Austral Indian Pacific Earth and Planetary Science Letters 492 264 278 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
topic |
speleothem oxygen isotopes Indo-Pacific Younger Dryas ITCZ deglaciation |
spellingShingle |
speleothem oxygen isotopes Indo-Pacific Younger Dryas ITCZ deglaciation Wurtzel, Jennifer Abram, Nerilie Lewis, Sophie Bajo, Petra Hellstrom, John Charles Troitzsch, Ulrike Heslop, David Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia |
topic_facet |
speleothem oxygen isotopes Indo-Pacific Younger Dryas ITCZ deglaciation |
description |
Abrupt changes in Atlantic Meridional Overturning Circulation are known to have affected the strength of the Indian and Asian Monsoons during glacial and deglacial climate states. However, there is still much uncertainty around the hydroclimate response of the Indo-Pacific Warm Pool (IPWP) region to abrupt climate changes in the North Atlantic. Many studies suggest a mean southward shift in the intertropical convergence zone (ITCZ) in the IPWP region during phases of reduced Atlantic meridional overturning, however, existing proxies have seasonal biases and conflicting responses, making it difficult to determine the true extent of North Atlantic forcing in this climatically important region. Here we present a precisely-dated, high-resolution record of eastern Indian Ocean hydroclimate variability spanning the last 16 ky (thousand years) from O measurements in an aragonite–calcite speleothem from central Sumatra. This represents the western-most speleothem record from the IPWP region. Precipitation arrives year-round at this site, with the majority sourced from the local tropical eastern Indian Ocean and two additional long-range seasonal sources associated with the boreal and austral summer monsoons. The Sumatran speleothem demonstrates a clear deglacial structure that includes 18O enrichment during the Younger Dryas and 18O depletion during the Bølling–Allerød, similar to the pattern seen in speleothems of the Asian and Indian monsoon realms. The speleothem O changes at this site are best explained by changes in rainfall amount and changes in the contributions from different moisture pathways. Reduced rainfall in Sumatra during the Younger Dryas is most likely driven by reductions in moisture transport along the northern or southern monsoon transport pathways to Sumatra. Considered with other regional proxies, the record from Sumatra suggests the response of the IPWP to North Atlantic freshwater forcing is not solely driven by southward shifts of the ITCZ, but also a reduction in moisture transport along both ... |
format |
Article in Journal/Newspaper |
author |
Wurtzel, Jennifer Abram, Nerilie Lewis, Sophie Bajo, Petra Hellstrom, John Charles Troitzsch, Ulrike Heslop, David |
author_facet |
Wurtzel, Jennifer Abram, Nerilie Lewis, Sophie Bajo, Petra Hellstrom, John Charles Troitzsch, Ulrike Heslop, David |
author_sort |
Wurtzel, Jennifer |
title |
Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia |
title_short |
Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia |
title_full |
Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia |
title_fullStr |
Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia |
title_full_unstemmed |
Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia |
title_sort |
tropical indo-pacific hydroclimate response to north atlantic forcing during the last deglaciation as recorded by a speleothem from sumatra, indonesia |
publisher |
Elsevier |
url |
http://hdl.handle.net/1885/257115 https://doi.org/10.1016/j.epsl.2018.04.001 https://openresearch-repository.anu.edu.au/bitstream/1885/257115/3/01_Wurtzel_Tropical_Indo-Pacific_2018.pdf.jpg |
geographic |
Austral Indian Pacific |
geographic_facet |
Austral Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Earth and Planetary Science Letters |
op_relation |
http://purl.org/au-research/grants/arc/DP110101161 http://purl.org/au-research/grants/arc/DP140102059 http://purl.org/au-research/grants/arc/CE110001028 http://purl.org/au-research/grants/arc/160100092 http://purl.org/au-research/grants/arc/FT130100801 0012-821X http://hdl.handle.net/1885/257115 doi:10.1016/j.epsl.2018.04.001 https://openresearch-repository.anu.edu.au/bitstream/1885/257115/3/01_Wurtzel_Tropical_Indo-Pacific_2018.pdf.jpg |
op_rights |
© 2018 The Authors |
op_doi |
https://doi.org/10.1016/j.epsl.2018.04.001 |
container_title |
Earth and Planetary Science Letters |
container_volume |
492 |
container_start_page |
264 |
op_container_end_page |
278 |
_version_ |
1788063314097471488 |