The last deglaciation: timing the bipolar seesaw
Precise information on the relative timing of north-south climate variations is a key to resolving questions concerning the mechanisms that force and couple climate changes between the hemispheres. We present a new composite record made from five well-resolved Antarctic ice core records that robustl...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:d613cf2c7108425293db1e77d3cb3730 2023-05-15T13:43:15+02:00 The last deglaciation: timing the bipolar seesaw J. B. Pedro T. D. van Ommen S. O. Rasmussen V. I. Morgan J. Chappellaz A. D. Moy V. Masson-Delmotte M. Delmotte 2011-06-01 https://doi.org/10.5194/cp-7-671-2011 http://www.clim-past.net/7/671/2011/cp-7-671-2011.pdf https://doaj.org/article/d613cf2c7108425293db1e77d3cb3730 en eng Copernicus Publications doi:10.5194/cp-7-671-2011 1814-9324 1814-9332 http://www.clim-past.net/7/671/2011/cp-7-671-2011.pdf https://doaj.org/article/d613cf2c7108425293db1e77d3cb3730 undefined Climate of the Past, Vol 7, Iss 2, Pp 671-683 (2011) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2011 fttriple https://doi.org/10.5194/cp-7-671-2011 2023-01-22T19:11:53Z Precise information on the relative timing of north-south climate variations is a key to resolving questions concerning the mechanisms that force and couple climate changes between the hemispheres. We present a new composite record made from five well-resolved Antarctic ice core records that robustly represents the timing of regional Antarctic climate change during the last deglaciation. Using fast variations in global methane gas concentrations as time markers, the Antarctic composite is directly compared to Greenland ice core records, allowing a detailed mapping of the inter-hemispheric sequence of climate changes. Consistent with prior studies the synchronized records show that warming (and cooling) trends in Antarctica closely match cold (and warm) periods in Greenland on millennial timescales. For the first time, we also identify a sub-millennial component to the inter-hemispheric coupling. Within the Antarctic Cold Reversal the strongest Antarctic cooling occurs during the pronounced northern warmth of the Bølling. Warming then resumes in Antarctica, potentially as early as the Intra-Allerød Cold Period, but with dating uncertainty that could place it as late as the onset of the Younger Dryas stadial. There is little-to-no time lag between climate transitions in Greenland and opposing changes in Antarctica. Our results lend support to fast acting inter-hemispheric coupling mechanisms, including recently proposed bipolar atmospheric teleconnections and/or rapid bipolar ocean teleconnections. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Greenland ice core ice core Unknown Antarctic Greenland The Antarctic Climate of the Past 7 2 671 683 |
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geo envir J. B. Pedro T. D. van Ommen S. O. Rasmussen V. I. Morgan J. Chappellaz A. D. Moy V. Masson-Delmotte M. Delmotte The last deglaciation: timing the bipolar seesaw |
topic_facet |
geo envir |
description |
Precise information on the relative timing of north-south climate variations is a key to resolving questions concerning the mechanisms that force and couple climate changes between the hemispheres. We present a new composite record made from five well-resolved Antarctic ice core records that robustly represents the timing of regional Antarctic climate change during the last deglaciation. Using fast variations in global methane gas concentrations as time markers, the Antarctic composite is directly compared to Greenland ice core records, allowing a detailed mapping of the inter-hemispheric sequence of climate changes. Consistent with prior studies the synchronized records show that warming (and cooling) trends in Antarctica closely match cold (and warm) periods in Greenland on millennial timescales. For the first time, we also identify a sub-millennial component to the inter-hemispheric coupling. Within the Antarctic Cold Reversal the strongest Antarctic cooling occurs during the pronounced northern warmth of the Bølling. Warming then resumes in Antarctica, potentially as early as the Intra-Allerød Cold Period, but with dating uncertainty that could place it as late as the onset of the Younger Dryas stadial. There is little-to-no time lag between climate transitions in Greenland and opposing changes in Antarctica. Our results lend support to fast acting inter-hemispheric coupling mechanisms, including recently proposed bipolar atmospheric teleconnections and/or rapid bipolar ocean teleconnections. |
format |
Article in Journal/Newspaper |
author |
J. B. Pedro T. D. van Ommen S. O. Rasmussen V. I. Morgan J. Chappellaz A. D. Moy V. Masson-Delmotte M. Delmotte |
author_facet |
J. B. Pedro T. D. van Ommen S. O. Rasmussen V. I. Morgan J. Chappellaz A. D. Moy V. Masson-Delmotte M. Delmotte |
author_sort |
J. B. Pedro |
title |
The last deglaciation: timing the bipolar seesaw |
title_short |
The last deglaciation: timing the bipolar seesaw |
title_full |
The last deglaciation: timing the bipolar seesaw |
title_fullStr |
The last deglaciation: timing the bipolar seesaw |
title_full_unstemmed |
The last deglaciation: timing the bipolar seesaw |
title_sort |
last deglaciation: timing the bipolar seesaw |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/cp-7-671-2011 http://www.clim-past.net/7/671/2011/cp-7-671-2011.pdf https://doaj.org/article/d613cf2c7108425293db1e77d3cb3730 |
geographic |
Antarctic Greenland The Antarctic |
geographic_facet |
Antarctic Greenland The Antarctic |
genre |
Antarc* Antarctic Antarctica Greenland Greenland ice core ice core |
genre_facet |
Antarc* Antarctic Antarctica Greenland Greenland ice core ice core |
op_source |
Climate of the Past, Vol 7, Iss 2, Pp 671-683 (2011) |
op_relation |
doi:10.5194/cp-7-671-2011 1814-9324 1814-9332 http://www.clim-past.net/7/671/2011/cp-7-671-2011.pdf https://doaj.org/article/d613cf2c7108425293db1e77d3cb3730 |
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undefined |
op_doi |
https://doi.org/10.5194/cp-7-671-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
2 |
container_start_page |
671 |
op_container_end_page |
683 |
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1766186313715810304 |