Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events
The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard–Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Ev...
Published in: | Nature Geoscience |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:3487 2023-05-15T13:55:44+02:00 Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events Gottschalk, Julia Skinner, Luke C. Misra, Sambuddha Waelbroeck, Claire Meenviel, Laurie Timmermann, Axel 2015-10-12 text image http://eprints.esc.cam.ac.uk/3487/ http://eprints.esc.cam.ac.uk/3487/3/ngeo2558.pdf http://eprints.esc.cam.ac.uk/3487/1/ngeo2558-f1.jpg http://eprints.esc.cam.ac.uk/3487/2/ngeo2558-s1.pdf http://www.nature.com/ngeo/journal/v8/n12/abs/ngeo2558.html https://doi.org/10.1038/ngeo2558 en eng Nature Publishing Group http://eprints.esc.cam.ac.uk/3487/3/ngeo2558.pdf http://eprints.esc.cam.ac.uk/3487/1/ngeo2558-f1.jpg http://eprints.esc.cam.ac.uk/3487/2/ngeo2558-s1.pdf Gottschalk, Julia and Skinner, Luke C. and Misra, Sambuddha and Waelbroeck, Claire and Meenviel, Laurie and Timmermann, Axel (2015) Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events. Nature Geoscience, 8. pp. 950-954. ISSN 1752-0894 EISSN:1752-0908 DOI https://doi.org/10.1038/ngeo2558 <https://doi.org/10.1038/ngeo2558> cc_by CC-BY 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2015 ftucambridgeesc https://doi.org/10.1038/ngeo2558 2020-08-27T18:09:41Z The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard–Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Evidence for such changes during the longer Heinrich stadials has been identified, but direct evidence for overturning circulation changes during Dansgaard–Oeschger events has proven elusive. Here we reconstruct bottom water [CO32−] variability from B/Ca ratios of benthic foraminifera and indicators of sedimentary dissolution, and use these reconstructions to infer the flow of northern-sourced deep water to the deep central sub-Antarctic Atlantic Ocean. We find that nearly every Dansgaard–Oeschger interstadial is accompanied by a rapid incursion of North Atlantic Deep Water into the deep South Atlantic. Based on these results and transient climate model simulations, we conclude that North Atlantic stadial–interstadial climate variability was associated with significant Atlantic overturning circulation changes that were rapidly transmitted across the Atlantic. However, by demonstrating the persistent role of Atlantic overturning circulation changes in past abrupt climate variability, our reconstructions of carbonate chemistry further indicate that the carbon cycle response to abrupt climate change was not a simple function of North Atlantic overturning. Article in Journal/Newspaper Antarc* Antarctic Dansgaard-Oeschger events North Atlantic Deep Water North Atlantic University of Cambridge, Department of Earth Sciences: ESC Publications Antarctic Nature Geoscience 8 12 950 954 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Gottschalk, Julia Skinner, Luke C. Misra, Sambuddha Waelbroeck, Claire Meenviel, Laurie Timmermann, Axel Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard–Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Evidence for such changes during the longer Heinrich stadials has been identified, but direct evidence for overturning circulation changes during Dansgaard–Oeschger events has proven elusive. Here we reconstruct bottom water [CO32−] variability from B/Ca ratios of benthic foraminifera and indicators of sedimentary dissolution, and use these reconstructions to infer the flow of northern-sourced deep water to the deep central sub-Antarctic Atlantic Ocean. We find that nearly every Dansgaard–Oeschger interstadial is accompanied by a rapid incursion of North Atlantic Deep Water into the deep South Atlantic. Based on these results and transient climate model simulations, we conclude that North Atlantic stadial–interstadial climate variability was associated with significant Atlantic overturning circulation changes that were rapidly transmitted across the Atlantic. However, by demonstrating the persistent role of Atlantic overturning circulation changes in past abrupt climate variability, our reconstructions of carbonate chemistry further indicate that the carbon cycle response to abrupt climate change was not a simple function of North Atlantic overturning. |
format |
Article in Journal/Newspaper |
author |
Gottschalk, Julia Skinner, Luke C. Misra, Sambuddha Waelbroeck, Claire Meenviel, Laurie Timmermann, Axel |
author_facet |
Gottschalk, Julia Skinner, Luke C. Misra, Sambuddha Waelbroeck, Claire Meenviel, Laurie Timmermann, Axel |
author_sort |
Gottschalk, Julia |
title |
Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events |
title_short |
Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events |
title_full |
Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events |
title_fullStr |
Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events |
title_full_unstemmed |
Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events |
title_sort |
abrupt changes in the southern extent of north atlantic deep water during dansgaard–oeschger events |
publisher |
Nature Publishing Group |
publishDate |
2015 |
url |
http://eprints.esc.cam.ac.uk/3487/ http://eprints.esc.cam.ac.uk/3487/3/ngeo2558.pdf http://eprints.esc.cam.ac.uk/3487/1/ngeo2558-f1.jpg http://eprints.esc.cam.ac.uk/3487/2/ngeo2558-s1.pdf http://www.nature.com/ngeo/journal/v8/n12/abs/ngeo2558.html https://doi.org/10.1038/ngeo2558 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Dansgaard-Oeschger events North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Dansgaard-Oeschger events North Atlantic Deep Water North Atlantic |
op_relation |
http://eprints.esc.cam.ac.uk/3487/3/ngeo2558.pdf http://eprints.esc.cam.ac.uk/3487/1/ngeo2558-f1.jpg http://eprints.esc.cam.ac.uk/3487/2/ngeo2558-s1.pdf Gottschalk, Julia and Skinner, Luke C. and Misra, Sambuddha and Waelbroeck, Claire and Meenviel, Laurie and Timmermann, Axel (2015) Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events. Nature Geoscience, 8. pp. 950-954. ISSN 1752-0894 EISSN:1752-0908 DOI https://doi.org/10.1038/ngeo2558 <https://doi.org/10.1038/ngeo2558> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/ngeo2558 |
container_title |
Nature Geoscience |
container_volume |
8 |
container_issue |
12 |
container_start_page |
950 |
op_container_end_page |
954 |
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1766262572622807040 |