Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene
Observations and model experiments highlight the importance of ocean heat in forcing ice sheet retreat during the present and geological past, but past ocean temperature data are virtually missing in ice sheet proximal locations. Here we document paleoceanographic conditions and the (in)stability of...
Main Authors: | , , , , , , , , , , , , , |
---|---|
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://dspace.library.uu.nl/handle/1874/363263 |
id |
ftunivutrecht:oai:dspace.library.uu.nl:1874/363263 |
---|---|
record_format |
openpolar |
spelling |
ftunivutrecht:oai:dspace.library.uu.nl:1874/363263 2023-07-23T04:15:31+02:00 Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene Sangiorgi, Francesca Bijl, Peter K. Passchier, Sandra Salzmann, Ulrich Schouten, Stefan McKay, Robert Cody, Rosemary D. Pross, Jörg Van De Flierdt, Tina Bohaty, Steven M Levy, Richard Williams, Trevor Escutia, Carlota Brinkhuis, Henk Marine palynology and palaeoceanography Organic geochemistry Marine Palynology 2018-01-22 image/pdf https://dspace.library.uu.nl/handle/1874/363263 en eng 2041-1723 https://dspace.library.uu.nl/handle/1874/363263 info:eu-repo/semantics/OpenAccess Chemistry(all) Biochemistry Genetics and Molecular Biology(all) Physics and Astronomy(all) Article 2018 ftunivutrecht 2023-07-02T02:25:23Z Observations and model experiments highlight the importance of ocean heat in forcing ice sheet retreat during the present and geological past, but past ocean temperature data are virtually missing in ice sheet proximal locations. Here we document paleoceanographic conditions and the (in)stability of the Wilkes Land subglacial basin (East Antarctica) during the mid-Miocene (~17-13.4 million years ago) by studying sediment cores from offshore Adélie Coast. Inland retreat of the ice sheet, temperate vegetation, and warm oligotrophic waters characterise the mid-Miocene Climatic Optimum (MCO; 17-14.8 Ma). After the MCO, expansion of a marine-based ice sheet occurs, but remains sensitive to melting upon episodic warm water incursions. Our results suggest that the mid-Miocene latitudinal temperature gradient across the Southern Ocean never resembled that of the present day. We demonstrate that a strong coupling of oceanic climate and Antarctic continental conditions existed and that the East Antarctic subglacial basins were highly sensitive to ocean warming. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Wilkes Land Utrecht University Repository Adélie Coast ENVELOPE(139.000,139.000,-60.000,-60.000) Antarctic East Antarctica Southern Ocean Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Chemistry(all) Biochemistry Genetics and Molecular Biology(all) Physics and Astronomy(all) |
spellingShingle |
Chemistry(all) Biochemistry Genetics and Molecular Biology(all) Physics and Astronomy(all) Sangiorgi, Francesca Bijl, Peter K. Passchier, Sandra Salzmann, Ulrich Schouten, Stefan McKay, Robert Cody, Rosemary D. Pross, Jörg Van De Flierdt, Tina Bohaty, Steven M Levy, Richard Williams, Trevor Escutia, Carlota Brinkhuis, Henk Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene |
topic_facet |
Chemistry(all) Biochemistry Genetics and Molecular Biology(all) Physics and Astronomy(all) |
description |
Observations and model experiments highlight the importance of ocean heat in forcing ice sheet retreat during the present and geological past, but past ocean temperature data are virtually missing in ice sheet proximal locations. Here we document paleoceanographic conditions and the (in)stability of the Wilkes Land subglacial basin (East Antarctica) during the mid-Miocene (~17-13.4 million years ago) by studying sediment cores from offshore Adélie Coast. Inland retreat of the ice sheet, temperate vegetation, and warm oligotrophic waters characterise the mid-Miocene Climatic Optimum (MCO; 17-14.8 Ma). After the MCO, expansion of a marine-based ice sheet occurs, but remains sensitive to melting upon episodic warm water incursions. Our results suggest that the mid-Miocene latitudinal temperature gradient across the Southern Ocean never resembled that of the present day. We demonstrate that a strong coupling of oceanic climate and Antarctic continental conditions existed and that the East Antarctic subglacial basins were highly sensitive to ocean warming. |
author2 |
Marine palynology and palaeoceanography Organic geochemistry Marine Palynology |
format |
Article in Journal/Newspaper |
author |
Sangiorgi, Francesca Bijl, Peter K. Passchier, Sandra Salzmann, Ulrich Schouten, Stefan McKay, Robert Cody, Rosemary D. Pross, Jörg Van De Flierdt, Tina Bohaty, Steven M Levy, Richard Williams, Trevor Escutia, Carlota Brinkhuis, Henk |
author_facet |
Sangiorgi, Francesca Bijl, Peter K. Passchier, Sandra Salzmann, Ulrich Schouten, Stefan McKay, Robert Cody, Rosemary D. Pross, Jörg Van De Flierdt, Tina Bohaty, Steven M Levy, Richard Williams, Trevor Escutia, Carlota Brinkhuis, Henk |
author_sort |
Sangiorgi, Francesca |
title |
Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene |
title_short |
Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene |
title_full |
Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene |
title_fullStr |
Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene |
title_full_unstemmed |
Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene |
title_sort |
southern ocean warming and wilkes land ice sheet retreat during the mid-miocene |
publishDate |
2018 |
url |
https://dspace.library.uu.nl/handle/1874/363263 |
long_lat |
ENVELOPE(139.000,139.000,-60.000,-60.000) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Adélie Coast Antarctic East Antarctica Southern Ocean Wilkes Land |
geographic_facet |
Adélie Coast Antarctic East Antarctica Southern Ocean Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Wilkes Land |
op_relation |
2041-1723 https://dspace.library.uu.nl/handle/1874/363263 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772176370063900672 |