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...
Published in: | Proceedings of the National Academy of Sciences |
---|---|
Main Authors: | , , , , , , , , , , , , , , |
Format: | Text |
Language: | English |
Published: |
National Academy of Sciences
2012
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3340021 http://www.ncbi.nlm.nih.gov/pubmed/22496594 https://doi.org/10.1073/pnas.1112248109 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:3340021 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:3340021 2023-05-15T13:54:23+02:00 Antarctic and Southern Ocean influences on Late Pliocene global cooling McKay, Robert Naish, Tim Carter, Lionel Riesselman, Christina Dunbar, Robert Sjunneskog, Charlotte Winter, Diane Sangiorgi, Francesca Warren, Courtney Pagani, Mark Schouten, Stefan Willmott, Veronica Levy, Richard DeConto, Robert Powell, Ross D. 2012-04-24 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3340021 http://www.ncbi.nlm.nih.gov/pubmed/22496594 https://doi.org/10.1073/pnas.1112248109 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3340021 http://www.ncbi.nlm.nih.gov/pubmed/22496594 http://dx.doi.org/10.1073/pnas.1112248109 Physical Sciences Text 2012 ftpubmed https://doi.org/10.1073/pnas.1112248109 2013-09-04T06:27:47Z 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. Text Antarc* Antarctic Antarctica Ice Sheet Ice Shelf North Atlantic Ross Ice Shelf Ross Sea Sea ice Southern Ocean PubMed Central (PMC) Antarctic Ross Ice Shelf Ross Sea Southern Ocean Proceedings of the National Academy of Sciences 109 17 6423 6428 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Physical Sciences |
spellingShingle |
Physical Sciences McKay, Robert Naish, Tim Carter, Lionel Riesselman, Christina Dunbar, Robert Sjunneskog, Charlotte Winter, Diane Sangiorgi, Francesca Warren, Courtney Pagani, Mark Schouten, Stefan Willmott, Veronica Levy, Richard DeConto, Robert Powell, Ross D. Antarctic and Southern Ocean influences on Late Pliocene global cooling |
topic_facet |
Physical Sciences |
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 |
Text |
author |
McKay, Robert Naish, Tim Carter, Lionel Riesselman, Christina Dunbar, Robert Sjunneskog, Charlotte Winter, Diane Sangiorgi, Francesca Warren, Courtney Pagani, Mark Schouten, Stefan Willmott, Veronica Levy, Richard DeConto, Robert Powell, Ross D. |
author_facet |
McKay, Robert Naish, Tim Carter, Lionel Riesselman, Christina Dunbar, Robert Sjunneskog, Charlotte Winter, Diane Sangiorgi, Francesca Warren, Courtney Pagani, Mark Schouten, Stefan Willmott, Veronica Levy, Richard DeConto, Robert Powell, Ross D. |
author_sort |
McKay, Robert |
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 |
publisher |
National Academy of Sciences |
publishDate |
2012 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3340021 http://www.ncbi.nlm.nih.gov/pubmed/22496594 https://doi.org/10.1073/pnas.1112248109 |
geographic |
Antarctic Ross Ice Shelf Ross Sea Southern Ocean |
geographic_facet |
Antarctic Ross Ice Shelf Ross Sea Southern Ocean |
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 |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3340021 http://www.ncbi.nlm.nih.gov/pubmed/22496594 http://dx.doi.org/10.1073/pnas.1112248109 |
op_doi |
https://doi.org/10.1073/pnas.1112248109 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
109 |
container_issue |
17 |
container_start_page |
6423 |
op_container_end_page |
6428 |
_version_ |
1766260131119497216 |