Bipolar seesaw control on last interglacial sea level
Our current understanding of ocean-atmosphere-cryosphere interactions at ice-age terminations relies largely on assessments of the most recent (last) glacial-interglacial transition, Termination I (T-I). But the extent to which T-I is representative of previous terminations remains unclear. Testing...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/102637 2024-01-14T10:01:33+01:00 Bipolar seesaw control on last interglacial sea level Marino, Gianluca Rohling, Eelco Rodriguez Sanz, Laura Grant, Katharine Heslop, David Roberts, Andrew Stanford, J. D Yu, Jimin http://hdl.handle.net/1885/102637 https://doi.org/10.1038/nature14499 https://openresearch-repository.anu.edu.au/bitstream/1885/102637/5/01_Marino_Bipolar_seesaw_control_on_last_2015.pdf.jpg unknown Macmillan Publishers Ltd 0028-0836 http://hdl.handle.net/1885/102637 doi:10.1038/nature14499 https://openresearch-repository.anu.edu.au/bitstream/1885/102637/5/01_Marino_Bipolar_seesaw_control_on_last_2015.pdf.jpg Nature Journal article ftanucanberra https://doi.org/10.1038/nature14499 2023-12-15T09:35:13Z Our current understanding of ocean-atmosphere-cryosphere interactions at ice-age terminations relies largely on assessments of the most recent (last) glacial-interglacial transition, Termination I (T-I). But the extent to which T-I is representative of previous terminations remains unclear. Testing the consistency of termination processes requires comparison of time series of critical climate parameters with detailed absolute and relative age control. However, such age control has been lacking for even the penultimate glacial termination (T-II), which culminated in a sea-level highstand during the last interglacial period that was several metres above present. Here we show that Heinrich Stadial 11 (HS11), a prominent North Atlantic cold episode, occurred between 135 ± 1 and 130 ± 2 thousand years ago and was linked with rapid sea-level rise during T-II. Our conclusions are based on new and existing data for T-II and the last interglacial that we collate onto a single, radiometrically constrained chronology. The HS11 cold episode punctuated T-II and coincided directly with a major deglacial meltwater pulse, which predominantly entered the North Atlantic Ocean and accounted for about 70 per cent of the glacial-interglacial sea-level rise. We conclude that, possibly in response to stronger insolation and CO 2 forcing earlier in T-II, the relationship between climate and ice-volume changes differed fundamentally from that of T-I. In T-I, the major sea-level rise clearly post-dates Heinrich Stadial 1. We also find that HS11 coincided with sustained Antarctic warming, probably through a bipolar seesaw temperature response, and propose that this heat gain at high southern latitudes promoted Antarctic ice-sheet melting that fuelled the last interglacial sea-level peak. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet North Atlantic Australian National University: ANU Digital Collections Antarctic Nature 522 7555 197 201 |
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Australian National University: ANU Digital Collections |
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Our current understanding of ocean-atmosphere-cryosphere interactions at ice-age terminations relies largely on assessments of the most recent (last) glacial-interglacial transition, Termination I (T-I). But the extent to which T-I is representative of previous terminations remains unclear. Testing the consistency of termination processes requires comparison of time series of critical climate parameters with detailed absolute and relative age control. However, such age control has been lacking for even the penultimate glacial termination (T-II), which culminated in a sea-level highstand during the last interglacial period that was several metres above present. Here we show that Heinrich Stadial 11 (HS11), a prominent North Atlantic cold episode, occurred between 135 ± 1 and 130 ± 2 thousand years ago and was linked with rapid sea-level rise during T-II. Our conclusions are based on new and existing data for T-II and the last interglacial that we collate onto a single, radiometrically constrained chronology. The HS11 cold episode punctuated T-II and coincided directly with a major deglacial meltwater pulse, which predominantly entered the North Atlantic Ocean and accounted for about 70 per cent of the glacial-interglacial sea-level rise. We conclude that, possibly in response to stronger insolation and CO 2 forcing earlier in T-II, the relationship between climate and ice-volume changes differed fundamentally from that of T-I. In T-I, the major sea-level rise clearly post-dates Heinrich Stadial 1. We also find that HS11 coincided with sustained Antarctic warming, probably through a bipolar seesaw temperature response, and propose that this heat gain at high southern latitudes promoted Antarctic ice-sheet melting that fuelled the last interglacial sea-level peak. |
format |
Article in Journal/Newspaper |
author |
Marino, Gianluca Rohling, Eelco Rodriguez Sanz, Laura Grant, Katharine Heslop, David Roberts, Andrew Stanford, J. D Yu, Jimin |
spellingShingle |
Marino, Gianluca Rohling, Eelco Rodriguez Sanz, Laura Grant, Katharine Heslop, David Roberts, Andrew Stanford, J. D Yu, Jimin Bipolar seesaw control on last interglacial sea level |
author_facet |
Marino, Gianluca Rohling, Eelco Rodriguez Sanz, Laura Grant, Katharine Heslop, David Roberts, Andrew Stanford, J. D Yu, Jimin |
author_sort |
Marino, Gianluca |
title |
Bipolar seesaw control on last interglacial sea level |
title_short |
Bipolar seesaw control on last interglacial sea level |
title_full |
Bipolar seesaw control on last interglacial sea level |
title_fullStr |
Bipolar seesaw control on last interglacial sea level |
title_full_unstemmed |
Bipolar seesaw control on last interglacial sea level |
title_sort |
bipolar seesaw control on last interglacial sea level |
publisher |
Macmillan Publishers Ltd |
url |
http://hdl.handle.net/1885/102637 https://doi.org/10.1038/nature14499 https://openresearch-repository.anu.edu.au/bitstream/1885/102637/5/01_Marino_Bipolar_seesaw_control_on_last_2015.pdf.jpg |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet North Atlantic |
genre_facet |
Antarc* Antarctic Ice Sheet North Atlantic |
op_source |
Nature |
op_relation |
0028-0836 http://hdl.handle.net/1885/102637 doi:10.1038/nature14499 https://openresearch-repository.anu.edu.au/bitstream/1885/102637/5/01_Marino_Bipolar_seesaw_control_on_last_2015.pdf.jpg |
op_doi |
https://doi.org/10.1038/nature14499 |
container_title |
Nature |
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522 |
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7555 |
container_start_page |
197 |
op_container_end_page |
201 |
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1788067318364897280 |