Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record
We propose that from ∼3 to 1 million years ago, ice volume changes occurred in both the Northern and Southern Hemispheres, each controlled by local summer insolation. Because Earth's orbital precession is out of phase between hemispheres, 23,000-year changes in ice volume in each hemisphere can...
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American Association for the Advancement of Science (AAAS)
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Online Access: | http://dx.doi.org/10.1126/science.1123296 https://www.science.org/doi/pdf/10.1126/science.1123296 |
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craaas:10.1126/science.1123296 2024-06-23T07:47:56+00:00 Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record Raymo, M. E. Lisiecki, L. E. Nisancioglu, Kerim H. 2006 http://dx.doi.org/10.1126/science.1123296 https://www.science.org/doi/pdf/10.1126/science.1123296 en eng American Association for the Advancement of Science (AAAS) Science volume 313, issue 5786, page 492-495 ISSN 0036-8075 1095-9203 journal-article 2006 craaas https://doi.org/10.1126/science.1123296 2024-06-13T04:01:43Z We propose that from ∼3 to 1 million years ago, ice volume changes occurred in both the Northern and Southern Hemispheres, each controlled by local summer insolation. Because Earth's orbital precession is out of phase between hemispheres, 23,000-year changes in ice volume in each hemisphere cancel out in globally integrated proxies such as ocean δ 18 O or sea level, leaving the in-phase obliquity (41,000 years) component of insolation to dominate those records. Only a modest ice mass change in Antarctica is required to effectively cancel out a much larger northern ice volume signal. At the mid-Pleistocene transition, we propose that marine-based ice sheet margins replaced terrestrial ice margins around the perimeter of East Antarctica, resulting in a shift to in-phase behavior of northern and southern ice sheets as well as the strengthening of 23,000-year cyclicity in the marine δ 18 O record. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet AAAS Resource Center (American Association for the Advancement of Science) Antarctic East Antarctica Science 313 5786 492 495 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
We propose that from ∼3 to 1 million years ago, ice volume changes occurred in both the Northern and Southern Hemispheres, each controlled by local summer insolation. Because Earth's orbital precession is out of phase between hemispheres, 23,000-year changes in ice volume in each hemisphere cancel out in globally integrated proxies such as ocean δ 18 O or sea level, leaving the in-phase obliquity (41,000 years) component of insolation to dominate those records. Only a modest ice mass change in Antarctica is required to effectively cancel out a much larger northern ice volume signal. At the mid-Pleistocene transition, we propose that marine-based ice sheet margins replaced terrestrial ice margins around the perimeter of East Antarctica, resulting in a shift to in-phase behavior of northern and southern ice sheets as well as the strengthening of 23,000-year cyclicity in the marine δ 18 O record. |
format |
Article in Journal/Newspaper |
author |
Raymo, M. E. Lisiecki, L. E. Nisancioglu, Kerim H. |
spellingShingle |
Raymo, M. E. Lisiecki, L. E. Nisancioglu, Kerim H. Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record |
author_facet |
Raymo, M. E. Lisiecki, L. E. Nisancioglu, Kerim H. |
author_sort |
Raymo, M. E. |
title |
Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record |
title_short |
Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record |
title_full |
Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record |
title_fullStr |
Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record |
title_full_unstemmed |
Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ 18 O Record |
title_sort |
plio-pleistocene ice volume, antarctic climate, and the global δ 18 o record |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2006 |
url |
http://dx.doi.org/10.1126/science.1123296 https://www.science.org/doi/pdf/10.1126/science.1123296 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
Science volume 313, issue 5786, page 492-495 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1123296 |
container_title |
Science |
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313 |
container_issue |
5786 |
container_start_page |
492 |
op_container_end_page |
495 |
_version_ |
1802638226249220096 |