Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene
The Pliocene and Early Pleistocene, between 5.3 and 0.8 million years ago, span a transition from a global climate state that was 2–3 °C warmer than present with limited ice sheets in the Northern Hemisphere to one that was characterized by continental-scale glaciations at both poles. Growth and dec...
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:345329 2023-05-15T13:42:01+02:00 Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene Patterson, M. O. McKay, R. Naish, T. Escutia, C. Jimenez-Espejo, F. J. Raymo, M. E. Meyers, S. R. Tauxe, L. Brinkhuis, H. Klaus, A. Fehr, A. Bendle, J. A. P. Bijl, P. K. Bohaty, S. M. Carr, S. A. Dunbar, R. B. Flores, J. A. Gonzalez, J. J. Hayden, T. G. Iwai, M. Katsuki, K. Kong, G. S. Nakai, M. Olney, M. P. Passchier, S. Pekar, S. F. Pross, J. Riesselman, C. R. Rohl, U. Sakai, T. Shrivastava, P. K. 2014-11-05 https://espace.library.uq.edu.au/view/UQ:345329 eng eng Nature Publishing Group doi:10.1038/ngeo2273 issn:1752-0908 issn:1752-0894 Not set VUW0903 RDF-13-VUW-003 CTM-2011-24079 OCE-1003603 OCE-1202632 NE/H014616/1 NE/I00646X/1 NE/I00646X/2 Geosciences Multidisciplinary Geology 1900 Earth and Planetary Sciences Journal Article 2014 ftunivqespace https://doi.org/10.1038/ngeo2273 2020-12-29T00:03:33Z The Pliocene and Early Pleistocene, between 5.3 and 0.8 million years ago, span a transition from a global climate state that was 2–3 °C warmer than present with limited ice sheets in the Northern Hemisphere to one that was characterized by continental-scale glaciations at both poles. Growth and decay of these ice sheets was paced by variations in the Earth’s orbit around the Sun. However, the nature of the influence of orbital forcing on the ice sheets is unclear, particularly in light of the absence of a strong 20,000-year precession signal in geologic records of global ice volume and sea level. Here we present a record of the rate of accumulation of iceberg-rafted debris offshore from the East Antarctic ice sheet, adjacent to the Wilkes Subglacial Basin, between 4.3 and 2.2 million years ago. We infer that maximum iceberg debris accumulation is associated with the enhanced calving of icebergs during ice-sheet margin retreat. In the warmer part of the record, between 4.3 and 3.5 million years ago, spectral analyses show a dominant periodicity of about 40,000 years. Subsequently, the powers of the 100,000-year and 20,000-year signals strengthen. We suggest that, as the Southern Ocean cooled between 3.5 and 2.5 million years ago, the development of a perennial sea-ice field limited the oceanic forcing of the ice sheet. After this threshold was crossed, substantial retreat of the East Antarctic ice sheet occurred only during austral summer insolation maxima, as controlled by the precession cycle. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Iceberg* Sea ice Southern Ocean The University of Queensland: UQ eSpace Antarctic Austral East Antarctic Ice Sheet Southern Ocean Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Nature Geoscience 7 11 841 847 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Geosciences Multidisciplinary Geology 1900 Earth and Planetary Sciences |
spellingShingle |
Geosciences Multidisciplinary Geology 1900 Earth and Planetary Sciences Patterson, M. O. McKay, R. Naish, T. Escutia, C. Jimenez-Espejo, F. J. Raymo, M. E. Meyers, S. R. Tauxe, L. Brinkhuis, H. Klaus, A. Fehr, A. Bendle, J. A. P. Bijl, P. K. Bohaty, S. M. Carr, S. A. Dunbar, R. B. Flores, J. A. Gonzalez, J. J. Hayden, T. G. Iwai, M. Katsuki, K. Kong, G. S. Nakai, M. Olney, M. P. Passchier, S. Pekar, S. F. Pross, J. Riesselman, C. R. Rohl, U. Sakai, T. Shrivastava, P. K. Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene |
topic_facet |
Geosciences Multidisciplinary Geology 1900 Earth and Planetary Sciences |
description |
The Pliocene and Early Pleistocene, between 5.3 and 0.8 million years ago, span a transition from a global climate state that was 2–3 °C warmer than present with limited ice sheets in the Northern Hemisphere to one that was characterized by continental-scale glaciations at both poles. Growth and decay of these ice sheets was paced by variations in the Earth’s orbit around the Sun. However, the nature of the influence of orbital forcing on the ice sheets is unclear, particularly in light of the absence of a strong 20,000-year precession signal in geologic records of global ice volume and sea level. Here we present a record of the rate of accumulation of iceberg-rafted debris offshore from the East Antarctic ice sheet, adjacent to the Wilkes Subglacial Basin, between 4.3 and 2.2 million years ago. We infer that maximum iceberg debris accumulation is associated with the enhanced calving of icebergs during ice-sheet margin retreat. In the warmer part of the record, between 4.3 and 3.5 million years ago, spectral analyses show a dominant periodicity of about 40,000 years. Subsequently, the powers of the 100,000-year and 20,000-year signals strengthen. We suggest that, as the Southern Ocean cooled between 3.5 and 2.5 million years ago, the development of a perennial sea-ice field limited the oceanic forcing of the ice sheet. After this threshold was crossed, substantial retreat of the East Antarctic ice sheet occurred only during austral summer insolation maxima, as controlled by the precession cycle. |
format |
Article in Journal/Newspaper |
author |
Patterson, M. O. McKay, R. Naish, T. Escutia, C. Jimenez-Espejo, F. J. Raymo, M. E. Meyers, S. R. Tauxe, L. Brinkhuis, H. Klaus, A. Fehr, A. Bendle, J. A. P. Bijl, P. K. Bohaty, S. M. Carr, S. A. Dunbar, R. B. Flores, J. A. Gonzalez, J. J. Hayden, T. G. Iwai, M. Katsuki, K. Kong, G. S. Nakai, M. Olney, M. P. Passchier, S. Pekar, S. F. Pross, J. Riesselman, C. R. Rohl, U. Sakai, T. Shrivastava, P. K. |
author_facet |
Patterson, M. O. McKay, R. Naish, T. Escutia, C. Jimenez-Espejo, F. J. Raymo, M. E. Meyers, S. R. Tauxe, L. Brinkhuis, H. Klaus, A. Fehr, A. Bendle, J. A. P. Bijl, P. K. Bohaty, S. M. Carr, S. A. Dunbar, R. B. Flores, J. A. Gonzalez, J. J. Hayden, T. G. Iwai, M. Katsuki, K. Kong, G. S. Nakai, M. Olney, M. P. Passchier, S. Pekar, S. F. Pross, J. Riesselman, C. R. Rohl, U. Sakai, T. Shrivastava, P. K. |
author_sort |
Patterson, M. O. |
title |
Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene |
title_short |
Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene |
title_full |
Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene |
title_fullStr |
Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene |
title_full_unstemmed |
Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene |
title_sort |
orbital forcing of the east antarctic ice sheet during the pliocene and early pleistocene |
publisher |
Nature Publishing Group |
publishDate |
2014 |
url |
https://espace.library.uq.edu.au/view/UQ:345329 |
long_lat |
ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Antarctic Austral East Antarctic Ice Sheet Southern Ocean Wilkes Subglacial Basin |
geographic_facet |
Antarctic Austral East Antarctic Ice Sheet Southern Ocean Wilkes Subglacial Basin |
genre |
Antarc* Antarctic Ice Sheet Iceberg* Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Iceberg* Sea ice Southern Ocean |
op_relation |
doi:10.1038/ngeo2273 issn:1752-0908 issn:1752-0894 Not set VUW0903 RDF-13-VUW-003 CTM-2011-24079 OCE-1003603 OCE-1202632 NE/H014616/1 NE/I00646X/1 NE/I00646X/2 |
op_doi |
https://doi.org/10.1038/ngeo2273 |
container_title |
Nature Geoscience |
container_volume |
7 |
container_issue |
11 |
container_start_page |
841 |
op_container_end_page |
847 |
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1766161854537662464 |