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Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth

Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth
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 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.
1752-0894
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Cook, Carys P.
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van de Flierdt, Tina
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Klaus, Adam
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Fehr, Annick
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Bendle, James A. P.
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Pekar, Stephen F.
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Pross, Jörg
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Stickley, Catherine E.
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Cook, Carys P.
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van de Flierdt, Tina
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Williams, Trevor
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Iwai, Masao
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Kobayashi, Munemasa
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Khim, Boo-Keun
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Passchier, Sandra
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Bohaty, Steven M.
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Klaus, Adam
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Carr, Stephanie A.
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Dunbar, Robert B.
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Flores, José Abel
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Kong, Gee Soo
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Olney, Matthew P.
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Pekar, Stephen F.
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Pross, Jörg
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Shrivastava, Prakash K.
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Stickley, Catherine E.
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Tuo, Shouting
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Welsh, Kevin
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Yamane, Masako
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Cook, Carys P., van de Flierdt, Tina, Williams, Trevor, Hemming, Sidney R., Iwai, Masao, Kobayashi, Munemasa, Jimenez-Espejo, Francisco J., Escutia, Carlota, González, Jhon Jairo, Khim, Boo-Keun, McKay, Robert M., Passchier, Sandra, Bohaty, Steven M., Riesselman, Christina R., Tauxe, Lisa, Sugisaki, Saiko, Galindo, Alberto Lopez, Patterson, Molly O., Sangiorgi, Francesca, Pierce, Elizabeth L., Brinkhuis, Henk, Klaus, Adam, Fehr, Annick, Bendle, James A. P., Bijl, Peter K., Carr, Stephanie A., Dunbar, Robert B., Flores, José Abel, Hayden, Travis G., Katsuki, Kota, Kong, Gee Soo, Nakai, Mutsumi, Olney, Matthew P., Pekar, Stephen F., Pross, Jörg, Röhl, Ursula, Sakai, Toyosaburo, Shrivastava, Prakash K., Stickley, Catherine E., Tuo, Shouting, Welsh, Kevin and Yamane, Masako (2013) Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth. Nature Geoscience, 6 (9), 765-769. (doi:10.1038/ngeo1889).

Record type: Article

Abstract

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.

Full text not available from this repository.

More information

Published date: July 2013
Organisations: Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 358513
URI: https://eprints.soton.ac.uk/id/eprint/358513
ISSN: 1752-0894
PURE UUID: ee1556b9-1d50-4d62-a010-c9159464c181
ORCID for Steven M. Bohaty: ORCID iD orcid.org/0000-0002-1193-7398

Catalogue record

Date deposited: 07 Oct 2013 16:13
Last modified: 06 Jun 2018 12:39

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Contributors

Author: Carys P. Cook
Author: Tina van de Flierdt
Author: Trevor Williams
Author: Sidney R. Hemming
Author: Masao Iwai
Author: Munemasa Kobayashi
Author: Francisco J. Jimenez-Espejo
Author: Carlota Escutia
Author: Jhon Jairo González
Author: Boo-Keun Khim
Author: Robert M. McKay
Author: Sandra Passchier
Author: Christina R. Riesselman
Author: Lisa Tauxe
Author: Saiko Sugisaki
Author: Alberto Lopez Galindo
Author: Molly O. Patterson
Author: Francesca Sangiorgi
Author: Elizabeth L. Pierce
Author: Henk Brinkhuis
Author: Adam Klaus
Author: Annick Fehr
Author: James A. P. Bendle
Author: Peter K. Bijl
Author: Stephanie A. Carr
Author: Robert B. Dunbar
Author: José Abel Flores
Author: Travis G. Hayden
Author: Kota Katsuki
Author: Gee Soo Kong
Author: Mutsumi Nakai
Author: Matthew P. Olney
Author: Stephen F. Pekar
Author: Jörg Pross
Author: Ursula Röhl
Author: Toyosaburo Sakai
Author: Prakash K. Shrivastava
Author: Catherine E. Stickley
Author: Shouting Tuo
Author: Kevin Welsh
Author: Masako Yamane

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