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...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2011
|
Subjects: | |
Online Access: | https://doi.org/10.5194/cp-7-671-2011 http://ecite.utas.edu.au/76817 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:76817 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:76817 2023-05-15T14:02:30+02:00 The last deglaciation: timing the bipolar seesaw Pedro, JB van Ommen, TD Rasmussen, SO Morgan, VI Chappellaz, J Moy, AD Masson-Delmotte, V Delmotte, M 2011 application/pdf https://doi.org/10.5194/cp-7-671-2011 http://ecite.utas.edu.au/76817 en eng Copernicus Publications http://ecite.utas.edu.au/76817/1/Pedro et al_ClimPast_2011- timing the bipolar seesaw.pdf http://dx.doi.org/10.5194/cp-7-671-2011 Pedro, JB and van Ommen, TD and Rasmussen, SO and Morgan, VI and Chappellaz, J and Moy, AD and Masson-Delmotte, V and Delmotte, M, The last deglaciation: timing the bipolar seesaw, Climate of the Past, 7, (2) pp. 671-683. ISSN 1814-9324 (2011) [Refereed Article] http://ecite.utas.edu.au/76817 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.5194/cp-7-671-2011 2019-12-13T21:43:03Z 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 Blling. Warming then resumes in Antarctica, potentially as early as the Intra-Allerd 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 eCite UTAS (University of Tasmania) Antarctic Greenland The Antarctic Climate of the Past 7 2 671 683 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Pedro, JB van Ommen, TD Rasmussen, SO Morgan, VI Chappellaz, J Moy, AD Masson-Delmotte, V Delmotte, M The last deglaciation: timing the bipolar seesaw |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
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 Blling. Warming then resumes in Antarctica, potentially as early as the Intra-Allerd 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 |
Pedro, JB van Ommen, TD Rasmussen, SO Morgan, VI Chappellaz, J Moy, AD Masson-Delmotte, V Delmotte, M |
author_facet |
Pedro, JB van Ommen, TD Rasmussen, SO Morgan, VI Chappellaz, J Moy, AD Masson-Delmotte, V Delmotte, M |
author_sort |
Pedro, JB |
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://ecite.utas.edu.au/76817 |
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_relation |
http://ecite.utas.edu.au/76817/1/Pedro et al_ClimPast_2011- timing the bipolar seesaw.pdf http://dx.doi.org/10.5194/cp-7-671-2011 Pedro, JB and van Ommen, TD and Rasmussen, SO and Morgan, VI and Chappellaz, J and Moy, AD and Masson-Delmotte, V and Delmotte, M, The last deglaciation: timing the bipolar seesaw, Climate of the Past, 7, (2) pp. 671-683. ISSN 1814-9324 (2011) [Refereed Article] http://ecite.utas.edu.au/76817 |
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 |
_version_ |
1766272789246902272 |