Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth
Warm intervals within the Pliocene epoch (5.33–2.58 million years ago) were characterized by global temperatures comparable to those predicted for the end of this century1 and atmospheric CO2 concentrations similar to today2, 3, 4. Estimates for global sea level highstands during these times5 imply...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/288611 2023-07-23T04:15:33+02:00 Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth Cook, C.P. Flierdt, T. van de Williams, T. Hemming, S.R. Iwai, M. Kobayashi, M. Jimenez-Espejo, F.J. Escutia, C. Gonzáles, J.J. Khim, B.-K. McKay, R.M. Passchier, S. Bohaty, S.M. Riesselman, C.R. Tauxe, L. Sugisaki, S. Lopez Galindo, A. Patterson, M.O. Sangiorgi, F. Pierce, E.L. Brinkhuis, H. 2013-09 text/plain https://dspace.library.uu.nl/handle/1874/288611 en eng 1752-0894 https://dspace.library.uu.nl/handle/1874/288611 info:eu-repo/semantics/ClosedAccess Aardwetenschappen Article 2013 ftunivutrecht 2023-07-02T00:49:53Z Warm intervals within the Pliocene epoch (5.33–2.58 million years ago) were characterized by global temperatures comparable to those predicted for the end of this century1 and atmospheric CO2 concentrations similar to today2, 3, 4. Estimates for global sea level highstands during these times5 imply possible retreat of the East Antarctic ice sheet, but ice-proximal evidence from the Antarctic margin is scarce. Here we present new data from Pliocene marine sediments recovered offshore of Adélie Land, East Antarctica, that reveal dynamic behaviour of the East Antarctic ice sheet in the vicinity of the low-lying Wilkes Subglacial Basin during times of past climatic warmth. Sedimentary sequences deposited between 5.3 and 3.3 million years ago indicate increases in Southern Ocean surface water productivity, associated with elevated circum-Antarctic temperatures. The geochemical provenance of detrital material deposited during these warm intervals suggests active erosion of continental bedrock from within the Wilkes Subglacial Basin, an area today buried beneath the East Antarctic ice sheet. We interpret this erosion to be associated with retreat of the ice sheet margin several hundreds of kilometres inland and conclude that the East Antarctic ice sheet was sensitive to climatic warmth during the Pliocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Utrecht University Repository Antarctic East Antarctic Ice Sheet East Antarctica Southern Ocean The Antarctic Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Aardwetenschappen |
spellingShingle |
Aardwetenschappen Cook, C.P. Flierdt, T. van de Williams, T. Hemming, S.R. Iwai, M. Kobayashi, M. Jimenez-Espejo, F.J. Escutia, C. Gonzáles, J.J. Khim, B.-K. McKay, R.M. Passchier, S. Bohaty, S.M. Riesselman, C.R. Tauxe, L. Sugisaki, S. Lopez Galindo, A. Patterson, M.O. Sangiorgi, F. Pierce, E.L. Brinkhuis, H. Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth |
topic_facet |
Aardwetenschappen |
description |
Warm intervals within the Pliocene epoch (5.33–2.58 million years ago) were characterized by global temperatures comparable to those predicted for the end of this century1 and atmospheric CO2 concentrations similar to today2, 3, 4. Estimates for global sea level highstands during these times5 imply possible retreat of the East Antarctic ice sheet, but ice-proximal evidence from the Antarctic margin is scarce. Here we present new data from Pliocene marine sediments recovered offshore of Adélie Land, East Antarctica, that reveal dynamic behaviour of the East Antarctic ice sheet in the vicinity of the low-lying Wilkes Subglacial Basin during times of past climatic warmth. Sedimentary sequences deposited between 5.3 and 3.3 million years ago indicate increases in Southern Ocean surface water productivity, associated with elevated circum-Antarctic temperatures. The geochemical provenance of detrital material deposited during these warm intervals suggests active erosion of continental bedrock from within the Wilkes Subglacial Basin, an area today buried beneath the East Antarctic ice sheet. We interpret this erosion to be associated with retreat of the ice sheet margin several hundreds of kilometres inland and conclude that the East Antarctic ice sheet was sensitive to climatic warmth during the Pliocene. |
format |
Article in Journal/Newspaper |
author |
Cook, C.P. Flierdt, T. van de Williams, T. Hemming, S.R. Iwai, M. Kobayashi, M. Jimenez-Espejo, F.J. Escutia, C. Gonzáles, J.J. Khim, B.-K. McKay, R.M. Passchier, S. Bohaty, S.M. Riesselman, C.R. Tauxe, L. Sugisaki, S. Lopez Galindo, A. Patterson, M.O. Sangiorgi, F. Pierce, E.L. Brinkhuis, H. |
author_facet |
Cook, C.P. Flierdt, T. van de Williams, T. Hemming, S.R. Iwai, M. Kobayashi, M. Jimenez-Espejo, F.J. Escutia, C. Gonzáles, J.J. Khim, B.-K. McKay, R.M. Passchier, S. Bohaty, S.M. Riesselman, C.R. Tauxe, L. Sugisaki, S. Lopez Galindo, A. Patterson, M.O. Sangiorgi, F. Pierce, E.L. Brinkhuis, H. |
author_sort |
Cook, C.P. |
title |
Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth |
title_short |
Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth |
title_full |
Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth |
title_fullStr |
Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth |
title_full_unstemmed |
Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth |
title_sort |
dynamic behaviour of the east antarctic ice sheet during pliocene warmth |
publishDate |
2013 |
url |
https://dspace.library.uu.nl/handle/1874/288611 |
long_lat |
ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Southern Ocean The Antarctic Wilkes Subglacial Basin |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Southern Ocean The Antarctic Wilkes Subglacial Basin |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean |
op_relation |
1752-0894 https://dspace.library.uu.nl/handle/1874/288611 |
op_rights |
info:eu-repo/semantics/ClosedAccess |
_version_ |
1772176410630160384 |