The spatial extent and dynamics of the Antarctic Cold Reversal
Antarctic ice cores show that a millennial-scale cooling event, the Antarctic Cold Reversal (14,700 to 13,000 years ago), interrupted the last deglaciation(1-3). The Antarctic Cold Reversal coincides with the Bolling-Allerod warm stage in the North Atlantic, providing an example of the inter-hemisph...
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:d003733 2023-05-15T13:47:31+02:00 The spatial extent and dynamics of the Antarctic Cold Reversal Pedro, Joel B. Bostock, Helen C. Bitz, Cecilia M. He, Feng Vandergoes, Marcus J. Steig, Eric J. Chase, Brian M. Krause, Claire E. Rasmussen, Sune O. Markle, Bradley R. Cortese, Giuseppe 2016-01-01 https://espace.library.uq.edu.au/view/UQ:d003733 eng eng Nature Publishing Group doi:10.1038/ngeo2580 issn:1752-0894 issn:1752-0908 orcid:0000-0002-8903-8958 2408 PLR 1341497 DE-AC05-00OR22725 258657 1302 Last Deglaciation Bipolar Seesaw Climate Precipitation Seasonality Journal Article 2016 ftunivqespace https://doi.org/10.1038/ngeo2580 2020-11-24T04:49:28Z Antarctic ice cores show that a millennial-scale cooling event, the Antarctic Cold Reversal (14,700 to 13,000 years ago), interrupted the last deglaciation(1-3). The Antarctic Cold Reversal coincides with the Bolling-Allerod warm stage in the North Atlantic, providing an example of the inter-hemispheric coupling of abrupt climate change generally referred to as the bipolar seesaw(4-9). However, the ocean-atmosphere dynamics governing this coupling are debated(10-15). Here we examine the extent and expression of the Antarctic Cold Reversal in the Southern Hemisphere using a synthesis of 84 palaeoclimate records. We find that the cooling is strongest in the South Atlantic and all regions south of 40 degrees S. At the same time, the terrestrial tropics and subtropics show abrupt hydrologic variations that are significantly correlated with North Atlantic climate changes. Our transient global climate model simulations indicate that the observed extent of Antarctic Cold Reversal cooling can be explained by enhanced northward ocean heat transport from the South to North Atlantic(10), amplified by the expansion and thickening of sea ice in the Southern Ocean. The hydrologic variations at lower latitudes result from an opposing enhancement of southward heat transport in the atmosphere mediated by the Hadley circulation. Our findings reconcile previous arguments about the relative dominance of ocean(5,10,11) and atmospheric(14,15) heat transports in inter-hemispheric coupling, demonstrating that the spatial pattern of past millennial-scale climate change reflects the superposition of both. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Sea ice Southern Ocean The University of Queensland: UQ eSpace Antarctic Southern Ocean The Antarctic Nature Geoscience 9 1 51 55 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Last Deglaciation Bipolar Seesaw Climate Precipitation Seasonality |
spellingShingle |
Last Deglaciation Bipolar Seesaw Climate Precipitation Seasonality Pedro, Joel B. Bostock, Helen C. Bitz, Cecilia M. He, Feng Vandergoes, Marcus J. Steig, Eric J. Chase, Brian M. Krause, Claire E. Rasmussen, Sune O. Markle, Bradley R. Cortese, Giuseppe The spatial extent and dynamics of the Antarctic Cold Reversal |
topic_facet |
Last Deglaciation Bipolar Seesaw Climate Precipitation Seasonality |
description |
Antarctic ice cores show that a millennial-scale cooling event, the Antarctic Cold Reversal (14,700 to 13,000 years ago), interrupted the last deglaciation(1-3). The Antarctic Cold Reversal coincides with the Bolling-Allerod warm stage in the North Atlantic, providing an example of the inter-hemispheric coupling of abrupt climate change generally referred to as the bipolar seesaw(4-9). However, the ocean-atmosphere dynamics governing this coupling are debated(10-15). Here we examine the extent and expression of the Antarctic Cold Reversal in the Southern Hemisphere using a synthesis of 84 palaeoclimate records. We find that the cooling is strongest in the South Atlantic and all regions south of 40 degrees S. At the same time, the terrestrial tropics and subtropics show abrupt hydrologic variations that are significantly correlated with North Atlantic climate changes. Our transient global climate model simulations indicate that the observed extent of Antarctic Cold Reversal cooling can be explained by enhanced northward ocean heat transport from the South to North Atlantic(10), amplified by the expansion and thickening of sea ice in the Southern Ocean. The hydrologic variations at lower latitudes result from an opposing enhancement of southward heat transport in the atmosphere mediated by the Hadley circulation. Our findings reconcile previous arguments about the relative dominance of ocean(5,10,11) and atmospheric(14,15) heat transports in inter-hemispheric coupling, demonstrating that the spatial pattern of past millennial-scale climate change reflects the superposition of both. |
format |
Article in Journal/Newspaper |
author |
Pedro, Joel B. Bostock, Helen C. Bitz, Cecilia M. He, Feng Vandergoes, Marcus J. Steig, Eric J. Chase, Brian M. Krause, Claire E. Rasmussen, Sune O. Markle, Bradley R. Cortese, Giuseppe |
author_facet |
Pedro, Joel B. Bostock, Helen C. Bitz, Cecilia M. He, Feng Vandergoes, Marcus J. Steig, Eric J. Chase, Brian M. Krause, Claire E. Rasmussen, Sune O. Markle, Bradley R. Cortese, Giuseppe |
author_sort |
Pedro, Joel B. |
title |
The spatial extent and dynamics of the Antarctic Cold Reversal |
title_short |
The spatial extent and dynamics of the Antarctic Cold Reversal |
title_full |
The spatial extent and dynamics of the Antarctic Cold Reversal |
title_fullStr |
The spatial extent and dynamics of the Antarctic Cold Reversal |
title_full_unstemmed |
The spatial extent and dynamics of the Antarctic Cold Reversal |
title_sort |
spatial extent and dynamics of the antarctic cold reversal |
publisher |
Nature Publishing Group |
publishDate |
2016 |
url |
https://espace.library.uq.edu.au/view/UQ:d003733 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic North Atlantic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Sea ice Southern Ocean |
op_relation |
doi:10.1038/ngeo2580 issn:1752-0894 issn:1752-0908 orcid:0000-0002-8903-8958 2408 PLR 1341497 DE-AC05-00OR22725 258657 1302 |
op_doi |
https://doi.org/10.1038/ngeo2580 |
container_title |
Nature Geoscience |
container_volume |
9 |
container_issue |
1 |
container_start_page |
51 |
op_container_end_page |
55 |
_version_ |
1766247259460075520 |