North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles
Variations in the ratio of magnesium to calcium (Mg/Ca) in fossil ostracodes from Deep Sea Drilling Project Site 607 in the deep North Atlantic show that the change in bottom water temperature during late Pliocene 41,000-year obliquity cycles averaged 1.5°C between 3.2 and 2.8 million years ago (Ma)...
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1995
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Online Access: | http://dx.doi.org/10.1126/science.270.5240.1347 https://www.science.org/doi/pdf/10.1126/science.270.5240.1347 |
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craaas:10.1126/science.270.5240.1347 2024-04-28T07:58:31+00:00 North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles Dwyer, Gary S. Cronin, Thomas M. Baker, Paul A. Raymo, Maureen E. Buzas, Jeffrey S. Corrège, Thierry 1995 http://dx.doi.org/10.1126/science.270.5240.1347 https://www.science.org/doi/pdf/10.1126/science.270.5240.1347 en eng American Association for the Advancement of Science (AAAS) Science volume 270, issue 5240, page 1347-1351 ISSN 0036-8075 1095-9203 Multidisciplinary journal-article 1995 craaas https://doi.org/10.1126/science.270.5240.1347 2024-04-09T06:41:11Z Variations in the ratio of magnesium to calcium (Mg/Ca) in fossil ostracodes from Deep Sea Drilling Project Site 607 in the deep North Atlantic show that the change in bottom water temperature during late Pliocene 41,000-year obliquity cycles averaged 1.5°C between 3.2 and 2.8 million years ago (Ma) and increased to 2.3°C between 2.8 and 2.3 Ma, coincidentally with the intensification of Northern Hemisphere glaciation. During the last two 100,000-year glacial-to-interglacial climatic cycles of the Quaternary, bottom water temperatures changed by 4.5°C. These results show that glacial deepwater cooling has intensified since 3.2 Ma, most likely as the result of progressively diminished deepwater production in the North Atlantic and of the greater influence of Antarctic bottom water in the North Atlantic during glacial periods. The ostracode Mg/Ca data also allow the direct determination of the temperature component of the benthic foraminiferal oxygen isotope record from Site 607, as well as derivation of a hypothetical sea-level curve for the late Pliocene and late Quaternary. The effects of dissolution on the Mg/Ca ratios of ostracode shells appear to have been minimal. Article in Journal/Newspaper Antarc* Antarctic North Atlantic AAAS Resource Center (American Association for the Advancement of Science) Science 270 5240 1347 1351 |
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AAAS Resource Center (American Association for the Advancement of Science) |
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language |
English |
topic |
Multidisciplinary |
spellingShingle |
Multidisciplinary Dwyer, Gary S. Cronin, Thomas M. Baker, Paul A. Raymo, Maureen E. Buzas, Jeffrey S. Corrège, Thierry North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles |
topic_facet |
Multidisciplinary |
description |
Variations in the ratio of magnesium to calcium (Mg/Ca) in fossil ostracodes from Deep Sea Drilling Project Site 607 in the deep North Atlantic show that the change in bottom water temperature during late Pliocene 41,000-year obliquity cycles averaged 1.5°C between 3.2 and 2.8 million years ago (Ma) and increased to 2.3°C between 2.8 and 2.3 Ma, coincidentally with the intensification of Northern Hemisphere glaciation. During the last two 100,000-year glacial-to-interglacial climatic cycles of the Quaternary, bottom water temperatures changed by 4.5°C. These results show that glacial deepwater cooling has intensified since 3.2 Ma, most likely as the result of progressively diminished deepwater production in the North Atlantic and of the greater influence of Antarctic bottom water in the North Atlantic during glacial periods. The ostracode Mg/Ca data also allow the direct determination of the temperature component of the benthic foraminiferal oxygen isotope record from Site 607, as well as derivation of a hypothetical sea-level curve for the late Pliocene and late Quaternary. The effects of dissolution on the Mg/Ca ratios of ostracode shells appear to have been minimal. |
format |
Article in Journal/Newspaper |
author |
Dwyer, Gary S. Cronin, Thomas M. Baker, Paul A. Raymo, Maureen E. Buzas, Jeffrey S. Corrège, Thierry |
author_facet |
Dwyer, Gary S. Cronin, Thomas M. Baker, Paul A. Raymo, Maureen E. Buzas, Jeffrey S. Corrège, Thierry |
author_sort |
Dwyer, Gary S. |
title |
North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles |
title_short |
North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles |
title_full |
North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles |
title_fullStr |
North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles |
title_full_unstemmed |
North Atlantic Deepwater Temperature Change During Late Pliocene and Late Quaternary Climatic Cycles |
title_sort |
north atlantic deepwater temperature change during late pliocene and late quaternary climatic cycles |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1126/science.270.5240.1347 https://www.science.org/doi/pdf/10.1126/science.270.5240.1347 |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_source |
Science volume 270, issue 5240, page 1347-1351 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.270.5240.1347 |
container_title |
Science |
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270 |
container_issue |
5240 |
container_start_page |
1347 |
op_container_end_page |
1351 |
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1797570005774106624 |