Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion
Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (∼55°S) southwest Pacific sea surface temperatures (SSTs) cooled 6° to 7°C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricit...
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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.1100061 https://www.science.org/doi/pdf/10.1126/science.1100061 |
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craaas:10.1126/science.1100061 2024-06-23T07:46:14+00:00 Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion Shevenell, Amelia E. Kennett, James P. Lea, David W. 2004 http://dx.doi.org/10.1126/science.1100061 https://www.science.org/doi/pdf/10.1126/science.1100061 en eng American Association for the Advancement of Science (AAAS) Science volume 305, issue 5691, page 1766-1770 ISSN 0036-8075 1095-9203 journal-article 2004 craaas https://doi.org/10.1126/science.1100061 2024-06-13T04:01:37Z Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (∼55°S) southwest Pacific sea surface temperatures (SSTs) cooled 6° to 7°C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by ∼60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO 2 ( p CO 2 ). Comparing SSTs and global carbon cycling proxies challenges the notion that episodic p CO 2 drawdown drove this major Cenozoic climate transition. SST, salinity, and ice-volume trends suggest instead that orbitally paced ocean circulation changes altered meridional heat/vapor transport, triggering ice growth and global cooling. Article in Journal/Newspaper Antarc* Antarctic Planktonic foraminifera Southern Ocean AAAS Resource Center (American Association for the Advancement of Science) Antarctic Pacific Southern Ocean Science 305 5691 1766 1770 |
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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 |
Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (∼55°S) southwest Pacific sea surface temperatures (SSTs) cooled 6° to 7°C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by ∼60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO 2 ( p CO 2 ). Comparing SSTs and global carbon cycling proxies challenges the notion that episodic p CO 2 drawdown drove this major Cenozoic climate transition. SST, salinity, and ice-volume trends suggest instead that orbitally paced ocean circulation changes altered meridional heat/vapor transport, triggering ice growth and global cooling. |
format |
Article in Journal/Newspaper |
author |
Shevenell, Amelia E. Kennett, James P. Lea, David W. |
spellingShingle |
Shevenell, Amelia E. Kennett, James P. Lea, David W. Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion |
author_facet |
Shevenell, Amelia E. Kennett, James P. Lea, David W. |
author_sort |
Shevenell, Amelia E. |
title |
Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion |
title_short |
Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion |
title_full |
Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion |
title_fullStr |
Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion |
title_full_unstemmed |
Middle Miocene Southern Ocean Cooling and Antarctic Cryosphere Expansion |
title_sort |
middle miocene southern ocean cooling and antarctic cryosphere expansion |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1126/science.1100061 https://www.science.org/doi/pdf/10.1126/science.1100061 |
geographic |
Antarctic Pacific Southern Ocean |
geographic_facet |
Antarctic Pacific Southern Ocean |
genre |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
op_source |
Science volume 305, issue 5691, page 1766-1770 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1100061 |
container_title |
Science |
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305 |
container_issue |
5691 |
container_start_page |
1766 |
op_container_end_page |
1770 |
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1802644715832606720 |