Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north
The mid-latitude westerly winds of the Southern Hemisphere play a central role in the global climate system via Southern Ocean upwelling1, carbon exchange with the deep ocean2, Agulhas leakage (transport of Indian Ocean waters into the Atlantic)3 and possibly Antarctic ice-sheet stability4. Meridion...
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Online Access: | https://curis.ku.dk/portal/da/publications/abrupt-iceage-shifts-in-southern-westerly-winds-and-antarctic-climate-forced-from-the-north(ed5a49cb-ab7d-4ac4-a7bd-49ff3b06df9f).html https://doi.org/10.1038/s41586-018-0727-5 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/ed5a49cb-ab7d-4ac4-a7bd-49ff3b06df9f 2023-12-17T10:21:46+01:00 Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north Buizert, Christo Sigl, Michael Severi, Mirko Markle, Bradley R. Wettstein, Justin J. McConnell, Joseph R. Pedro, Joel B. Sodemann, Harald Goto-Azuma, Kumiko Kawamura, Kenji Fujita, Shuji Motoyama, Hideaki Hirabayashi, Motohiro Uemura, Ryu Stenni, Barbara Parrenin, Frederic He, Feng Fudge, T. J. Steig, Eric J. 2018-11-29 https://curis.ku.dk/portal/da/publications/abrupt-iceage-shifts-in-southern-westerly-winds-and-antarctic-climate-forced-from-the-north(ed5a49cb-ab7d-4ac4-a7bd-49ff3b06df9f).html https://doi.org/10.1038/s41586-018-0727-5 eng eng info:eu-repo/semantics/closedAccess Buizert , C , Sigl , M , Severi , M , Markle , B R , Wettstein , J J , McConnell , J R , Pedro , J B , Sodemann , H , Goto-Azuma , K , Kawamura , K , Fujita , S , Motoyama , H , Hirabayashi , M , Uemura , R , Stenni , B , Parrenin , F , He , F , Fudge , T J & Steig , E J 2018 , ' Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north ' , Nature , vol. 563 , no. 7733 , pp. 681-699 . https://doi.org/10.1038/s41586-018-0727-5 article 2018 ftcopenhagenunip https://doi.org/10.1038/s41586-018-0727-5 2023-11-23T00:03:51Z The mid-latitude westerly winds of the Southern Hemisphere play a central role in the global climate system via Southern Ocean upwelling1, carbon exchange with the deep ocean2, Agulhas leakage (transport of Indian Ocean waters into the Atlantic)3 and possibly Antarctic ice-sheet stability4. Meridional shifts of the Southern Hemisphere westerly winds have been hypothesized to occur5,6 in parallel with the well-documented shifts of the intertropical convergence zone7 in response to Dansgaard–Oeschger (DO) events— abrupt North Atlantic climate change events of the last ice age. Shifting moisture pathways to West Antarctica8 are consistent with this view but may represent a Pacific teleconnection pattern forced from the tropics9. The full response of the Southern Hemisphere atmospheric circulation to the DO cycle and its impact on Antarctic temperature remain unclear10. Here we use five ice cores synchronized via volcanic markers to show that the Antarctic temperature response to the DO cycle can be understood as the superposition of two modes: a spatially homogeneous oceanic ‘bipolar seesaw’ mode that lags behind Northern Hemisphere climate by about 200 years, and a spatially heterogeneous atmospheric mode that is synchronous with abrupt events in the Northern Hemisphere. Temperature anomalies of the atmospheric mode are similar to those associated with present-day Southern Annular Mode variability, rather than the Pacific–South American pattern. Moreover, deuterium-excess records suggest a zonally coherent migration of the Southern Hemisphere westerly winds over all ocean basins in phase with Northern Hemisphere climate. Our work provides a simple conceptual framework for understanding circum-Antarctic temperature variations forced by abrupt Northern Hemisphere climate change. We provide observational evidence of abrupt shifts in the Southern Hemisphere westerly winds, which have previously documented1,2,3 ramifications for global ocean circulation and atmospheric carbon dioxide. These coupled changes highlight ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet North Atlantic Southern Ocean University of Copenhagen: Research Antarctic Southern Ocean The Antarctic Pacific Indian Nature 563 7733 681 685 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
The mid-latitude westerly winds of the Southern Hemisphere play a central role in the global climate system via Southern Ocean upwelling1, carbon exchange with the deep ocean2, Agulhas leakage (transport of Indian Ocean waters into the Atlantic)3 and possibly Antarctic ice-sheet stability4. Meridional shifts of the Southern Hemisphere westerly winds have been hypothesized to occur5,6 in parallel with the well-documented shifts of the intertropical convergence zone7 in response to Dansgaard–Oeschger (DO) events— abrupt North Atlantic climate change events of the last ice age. Shifting moisture pathways to West Antarctica8 are consistent with this view but may represent a Pacific teleconnection pattern forced from the tropics9. The full response of the Southern Hemisphere atmospheric circulation to the DO cycle and its impact on Antarctic temperature remain unclear10. Here we use five ice cores synchronized via volcanic markers to show that the Antarctic temperature response to the DO cycle can be understood as the superposition of two modes: a spatially homogeneous oceanic ‘bipolar seesaw’ mode that lags behind Northern Hemisphere climate by about 200 years, and a spatially heterogeneous atmospheric mode that is synchronous with abrupt events in the Northern Hemisphere. Temperature anomalies of the atmospheric mode are similar to those associated with present-day Southern Annular Mode variability, rather than the Pacific–South American pattern. Moreover, deuterium-excess records suggest a zonally coherent migration of the Southern Hemisphere westerly winds over all ocean basins in phase with Northern Hemisphere climate. Our work provides a simple conceptual framework for understanding circum-Antarctic temperature variations forced by abrupt Northern Hemisphere climate change. We provide observational evidence of abrupt shifts in the Southern Hemisphere westerly winds, which have previously documented1,2,3 ramifications for global ocean circulation and atmospheric carbon dioxide. These coupled changes highlight ... |
format |
Article in Journal/Newspaper |
author |
Buizert, Christo Sigl, Michael Severi, Mirko Markle, Bradley R. Wettstein, Justin J. McConnell, Joseph R. Pedro, Joel B. Sodemann, Harald Goto-Azuma, Kumiko Kawamura, Kenji Fujita, Shuji Motoyama, Hideaki Hirabayashi, Motohiro Uemura, Ryu Stenni, Barbara Parrenin, Frederic He, Feng Fudge, T. J. Steig, Eric J. |
spellingShingle |
Buizert, Christo Sigl, Michael Severi, Mirko Markle, Bradley R. Wettstein, Justin J. McConnell, Joseph R. Pedro, Joel B. Sodemann, Harald Goto-Azuma, Kumiko Kawamura, Kenji Fujita, Shuji Motoyama, Hideaki Hirabayashi, Motohiro Uemura, Ryu Stenni, Barbara Parrenin, Frederic He, Feng Fudge, T. J. Steig, Eric J. Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north |
author_facet |
Buizert, Christo Sigl, Michael Severi, Mirko Markle, Bradley R. Wettstein, Justin J. McConnell, Joseph R. Pedro, Joel B. Sodemann, Harald Goto-Azuma, Kumiko Kawamura, Kenji Fujita, Shuji Motoyama, Hideaki Hirabayashi, Motohiro Uemura, Ryu Stenni, Barbara Parrenin, Frederic He, Feng Fudge, T. J. Steig, Eric J. |
author_sort |
Buizert, Christo |
title |
Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north |
title_short |
Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north |
title_full |
Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north |
title_fullStr |
Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north |
title_full_unstemmed |
Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north |
title_sort |
abrupt ice-age shifts in southern westerly winds and antarctic climate forced from the north |
publishDate |
2018 |
url |
https://curis.ku.dk/portal/da/publications/abrupt-iceage-shifts-in-southern-westerly-winds-and-antarctic-climate-forced-from-the-north(ed5a49cb-ab7d-4ac4-a7bd-49ff3b06df9f).html https://doi.org/10.1038/s41586-018-0727-5 |
geographic |
Antarctic Southern Ocean The Antarctic Pacific Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic Pacific Indian |
genre |
Antarc* Antarctic Ice Sheet North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet North Atlantic Southern Ocean |
op_source |
Buizert , C , Sigl , M , Severi , M , Markle , B R , Wettstein , J J , McConnell , J R , Pedro , J B , Sodemann , H , Goto-Azuma , K , Kawamura , K , Fujita , S , Motoyama , H , Hirabayashi , M , Uemura , R , Stenni , B , Parrenin , F , He , F , Fudge , T J & Steig , E J 2018 , ' Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north ' , Nature , vol. 563 , no. 7733 , pp. 681-699 . https://doi.org/10.1038/s41586-018-0727-5 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1038/s41586-018-0727-5 |
container_title |
Nature |
container_volume |
563 |
container_issue |
7733 |
container_start_page |
681 |
op_container_end_page |
685 |
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1785538515232096256 |