Intensified deep Pacific inflow and ventilation in Pleistocene glacial times
The production of cold, deep waters in the Southern Ocean is an important factor in the Earth's heat budget1. The supply of deep water to the Pacific Ocean is presently dominated by a single source, the deep western boundary current east of New Zealand. Here we use sediment records deposited un...
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2001
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/1274/ http://www.nature.com/nature/journal/v412/n6849/full/412809a0.html https://doi.org/10.1038/35090552 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:1274 2023-05-15T13:39:21+02:00 Intensified deep Pacific inflow and ventilation in Pleistocene glacial times Hall, Ian Robert McCave, I. Nicholas Shackleton, Nicholas J. Weedon, Graham P. Harris, Sara E. 2001-08-23 https://orca.cardiff.ac.uk/id/eprint/1274/ http://www.nature.com/nature/journal/v412/n6849/full/412809a0.html https://doi.org/10.1038/35090552 unknown Nature Publishing Group Hall, Ian Robert https://orca.cardiff.ac.uk/view/cardiffauthors/A002402L.html orcid:0000-0001-6960-1419 orcid:0000-0001-6960-1419, McCave, I. Nicholas, Shackleton, Nicholas J., Weedon, Graham P. and Harris, Sara E. 2001. Intensified deep Pacific inflow and ventilation in Pleistocene glacial times. Nature 412 (6849) , pp. 809-812. 10.1038/35090552 https://doi.org/10.1038/35090552 doi:10.1038/35090552 GC Oceanography Article PeerReviewed 2001 ftunivcardiff https://doi.org/10.1038/35090552 2022-10-20T22:31:53Z The production of cold, deep waters in the Southern Ocean is an important factor in the Earth's heat budget1. The supply of deep water to the Pacific Ocean is presently dominated by a single source, the deep western boundary current east of New Zealand. Here we use sediment records deposited under the influence of this deep western boundary current to reconstruct deep-water properties and speed changes during the Pleistocene epoch. In physical and isotope proxies we find evidence for intensified deep Pacific Ocean inflow and ventilation during the glacial periods of the past 1.2 million years. The changes in throughflow may be directly related to an increased production of Antarctic Bottom Water during glacial times. Possible causes for such an increased bottom-water production include increasing wind strengths in the Southern Ocean or an increase in annual sea-ice formation, leaving dense water after brine rejection and thereby enhancing deep convection. We infer also that the global thermohaline circulation was perturbed significantly during the mid-Pleistocene climate transition between 0.86 and 0.45 million years ago. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Cardiff University: ORCA (Online Research @ Cardiff) Antarctic New Zealand Pacific Southern Ocean Nature 412 6849 809 812 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
GC Oceanography |
spellingShingle |
GC Oceanography Hall, Ian Robert McCave, I. Nicholas Shackleton, Nicholas J. Weedon, Graham P. Harris, Sara E. Intensified deep Pacific inflow and ventilation in Pleistocene glacial times |
topic_facet |
GC Oceanography |
description |
The production of cold, deep waters in the Southern Ocean is an important factor in the Earth's heat budget1. The supply of deep water to the Pacific Ocean is presently dominated by a single source, the deep western boundary current east of New Zealand. Here we use sediment records deposited under the influence of this deep western boundary current to reconstruct deep-water properties and speed changes during the Pleistocene epoch. In physical and isotope proxies we find evidence for intensified deep Pacific Ocean inflow and ventilation during the glacial periods of the past 1.2 million years. The changes in throughflow may be directly related to an increased production of Antarctic Bottom Water during glacial times. Possible causes for such an increased bottom-water production include increasing wind strengths in the Southern Ocean or an increase in annual sea-ice formation, leaving dense water after brine rejection and thereby enhancing deep convection. We infer also that the global thermohaline circulation was perturbed significantly during the mid-Pleistocene climate transition between 0.86 and 0.45 million years ago. |
format |
Article in Journal/Newspaper |
author |
Hall, Ian Robert McCave, I. Nicholas Shackleton, Nicholas J. Weedon, Graham P. Harris, Sara E. |
author_facet |
Hall, Ian Robert McCave, I. Nicholas Shackleton, Nicholas J. Weedon, Graham P. Harris, Sara E. |
author_sort |
Hall, Ian Robert |
title |
Intensified deep Pacific inflow and ventilation in Pleistocene glacial times |
title_short |
Intensified deep Pacific inflow and ventilation in Pleistocene glacial times |
title_full |
Intensified deep Pacific inflow and ventilation in Pleistocene glacial times |
title_fullStr |
Intensified deep Pacific inflow and ventilation in Pleistocene glacial times |
title_full_unstemmed |
Intensified deep Pacific inflow and ventilation in Pleistocene glacial times |
title_sort |
intensified deep pacific inflow and ventilation in pleistocene glacial times |
publisher |
Nature Publishing Group |
publishDate |
2001 |
url |
https://orca.cardiff.ac.uk/id/eprint/1274/ http://www.nature.com/nature/journal/v412/n6849/full/412809a0.html https://doi.org/10.1038/35090552 |
geographic |
Antarctic New Zealand Pacific Southern Ocean |
geographic_facet |
Antarctic New Zealand Pacific Southern Ocean |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
Hall, Ian Robert https://orca.cardiff.ac.uk/view/cardiffauthors/A002402L.html orcid:0000-0001-6960-1419 orcid:0000-0001-6960-1419, McCave, I. Nicholas, Shackleton, Nicholas J., Weedon, Graham P. and Harris, Sara E. 2001. Intensified deep Pacific inflow and ventilation in Pleistocene glacial times. Nature 412 (6849) , pp. 809-812. 10.1038/35090552 https://doi.org/10.1038/35090552 doi:10.1038/35090552 |
op_doi |
https://doi.org/10.1038/35090552 |
container_title |
Nature |
container_volume |
412 |
container_issue |
6849 |
container_start_page |
809 |
op_container_end_page |
812 |
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1766117647607398400 |