Antarctic and Southern Ocean influences on Late Pliocene global cooling
The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/252854 2023-07-23T04:15:20+02:00 Antarctic and Southern Ocean influences on Late Pliocene global cooling McKay, R. Naish, T. Carter, L. Riesselman, C. Dunbar, R. Sjunneskog, C. Winter, D. Sangiorgi, F. Warren, C. Pagani, M. Schouten, S. Willmot, V. Levy, R. DeConto, R. Powell, R.D. 2012 image/pdf https://dspace.library.uu.nl/handle/1874/252854 en eng 0027-8424 https://dspace.library.uu.nl/handle/1874/252854 info:eu-repo/semantics/ClosedAccess Aardwetenschappen glacial history West Antarctic Ice Sheet Late Neogene paleooceanography paleoclimate Article 2012 ftunivutrecht 2023-07-02T00:31:48Z The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1B sediment core recovered from beneath the Ross Ice Shelf. We provide evidence for a major expansion of an ice sheet in the Ross Sea that began at ~3.3 Ma, followed by a coastal sea surface temperature cooling of ~2.5 °C, a stepwise expansion of sea ice, and polynya-style deep mixing in the Ross Sea between 3.3 and 2.5 Ma. The intensification of Antarctic cooling resulted in strengthened westerly winds and invigorated ocean circulation. The associated northward migration of Southern Ocean fronts has been linked with reduced Atlantic Meridional Overturning Circulation by restricting surface water connectivity between the ocean basins, with implications for heat transport to the high latitudes of the North Atlantic. While our results do not exclude low-latitude mechanisms as drivers for Pliocene cooling, they indicate an additional role played by southern high-latitude cooling during development of the bipolar world. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf North Atlantic Ross Ice Shelf Ross Sea Sea ice Southern Ocean Utrecht University Repository Antarctic Ross Ice Shelf Ross Sea Southern Ocean West Antarctic Ice Sheet |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Aardwetenschappen glacial history West Antarctic Ice Sheet Late Neogene paleooceanography paleoclimate |
spellingShingle |
Aardwetenschappen glacial history West Antarctic Ice Sheet Late Neogene paleooceanography paleoclimate McKay, R. Naish, T. Carter, L. Riesselman, C. Dunbar, R. Sjunneskog, C. Winter, D. Sangiorgi, F. Warren, C. Pagani, M. Schouten, S. Willmot, V. Levy, R. DeConto, R. Powell, R.D. Antarctic and Southern Ocean influences on Late Pliocene global cooling |
topic_facet |
Aardwetenschappen glacial history West Antarctic Ice Sheet Late Neogene paleooceanography paleoclimate |
description |
The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1B sediment core recovered from beneath the Ross Ice Shelf. We provide evidence for a major expansion of an ice sheet in the Ross Sea that began at ~3.3 Ma, followed by a coastal sea surface temperature cooling of ~2.5 °C, a stepwise expansion of sea ice, and polynya-style deep mixing in the Ross Sea between 3.3 and 2.5 Ma. The intensification of Antarctic cooling resulted in strengthened westerly winds and invigorated ocean circulation. The associated northward migration of Southern Ocean fronts has been linked with reduced Atlantic Meridional Overturning Circulation by restricting surface water connectivity between the ocean basins, with implications for heat transport to the high latitudes of the North Atlantic. While our results do not exclude low-latitude mechanisms as drivers for Pliocene cooling, they indicate an additional role played by southern high-latitude cooling during development of the bipolar world. |
format |
Article in Journal/Newspaper |
author |
McKay, R. Naish, T. Carter, L. Riesselman, C. Dunbar, R. Sjunneskog, C. Winter, D. Sangiorgi, F. Warren, C. Pagani, M. Schouten, S. Willmot, V. Levy, R. DeConto, R. Powell, R.D. |
author_facet |
McKay, R. Naish, T. Carter, L. Riesselman, C. Dunbar, R. Sjunneskog, C. Winter, D. Sangiorgi, F. Warren, C. Pagani, M. Schouten, S. Willmot, V. Levy, R. DeConto, R. Powell, R.D. |
author_sort |
McKay, R. |
title |
Antarctic and Southern Ocean influences on Late Pliocene global cooling |
title_short |
Antarctic and Southern Ocean influences on Late Pliocene global cooling |
title_full |
Antarctic and Southern Ocean influences on Late Pliocene global cooling |
title_fullStr |
Antarctic and Southern Ocean influences on Late Pliocene global cooling |
title_full_unstemmed |
Antarctic and Southern Ocean influences on Late Pliocene global cooling |
title_sort |
antarctic and southern ocean influences on late pliocene global cooling |
publishDate |
2012 |
url |
https://dspace.library.uu.nl/handle/1874/252854 |
geographic |
Antarctic Ross Ice Shelf Ross Sea Southern Ocean West Antarctic Ice Sheet |
geographic_facet |
Antarctic Ross Ice Shelf Ross Sea Southern Ocean West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf North Atlantic Ross Ice Shelf Ross Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf North Atlantic Ross Ice Shelf Ross Sea Sea ice Southern Ocean |
op_relation |
0027-8424 https://dspace.library.uu.nl/handle/1874/252854 |
op_rights |
info:eu-repo/semantics/ClosedAccess |
_version_ |
1772189343768641536 |