Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth
| العنوان: | Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth |
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| المؤلفون: | Catherine E. Stickley, Sandra Passchier, Munemasa Kobayashi, Shouting Tuo, Francesca Sangiorgi, Masao Iwai, Carlota Escutia, M. Olney, Annick Fehr, Gee Soo Kong, José-Abel Flores, Kota Katsuki, Lisa Tauxe, Saiko Sugisaki, Molly O. Patterson, Francisco J. Jiménez-Espejo, J. J. González, Prakash K. Shrivastava, E. L. Pierce, Alberto Lopez Galindo, Mutsumi Nakai, Peter K. Bijl, Sidney R. Hemming, Trevor Williams, Toyosaburo Sakai, Travis G Hayden, Tina van de Flierdt, C. Cook, Kevin Welsh, Robert B. Dunbar, Stephen F. Pekar, Boo-Keun Khim, James A Bendle, Jörg Pross, Christina R. Riesselman, Adam Klaus, Ursula Röhl, Robert M. McKay, Stephanie A. Carr, Henk Brinkhuis, Steven M Bohaty, Masako Yamane |
| المصدر: | Nature Geoscience, 6, 765. Nature Publishing Group |
| بيانات النشر: | Springer Science and Business Media LLC, 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | geography, geography.geographical_feature_category, Ice stream, Antarctic ice sheet, Antarctic sea ice, Ice-sheet model, Paleontology, Oceanography, Ice core, Sea ice, General Earth and Planetary Sciences, Cryosphere, Ice sheet, Geology |
| الوصف: | 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. |
| وصف الملف: | text/plain |
| تدمد: | 1752-0908 1752-0894 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a8b5949b581e03c8b250e55b215049a https://doi.org/10.1038/ngeo1889 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....8a8b5949b581e03c8b250e55b215049a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17520908 17520894 |
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