Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka)
We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Heinrich stadial 2 and three Greenland interstadials of the 20– 50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We sho...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2016
|
Subjects: | |
Online Access: | https://boris.unibe.ch/89955/1/Burckel%20et%20al.,%2016.pdf https://boris.unibe.ch/89955/ |
id |
ftunivbern:oai:boris.unibe.ch:89955 |
---|---|
record_format |
openpolar |
spelling |
ftunivbern:oai:boris.unibe.ch:89955 2023-08-20T04:02:34+02:00 Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka) Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier Pichat, Sylvain Jaccard, Samuel Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, François 2016-11-08 application/pdf https://boris.unibe.ch/89955/1/Burckel%20et%20al.,%2016.pdf https://boris.unibe.ch/89955/ eng eng Copernicus Publications https://boris.unibe.ch/89955/ info:eu-repo/semantics/openAccess Burckel, Pierre; Waelbroeck, Claire; Luo, Yiming; Roche, Didier; Pichat, Sylvain; Jaccard, Samuel; Gherardi, Jeanne; Govin, Aline; Lippold, Jörg; Thil, François (2016). Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka). Climate of the past, 12(11), pp. 2016-2017. Copernicus Publications 10.5194/cp-12-2061-2016 <http://dx.doi.org/10.5194/cp-12-2061-2016> 550 Earth sciences & geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2016 ftunivbern https://doi.org/10.5194/cp-12-2061-2016 2023-07-31T21:30:00Z We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Heinrich stadial 2 and three Greenland interstadials of the 20– 50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We show that the deep Atlantic circulation during these interstadials was very different from that of the Holocene. Northern-sourced waters likely circulated above 2500m depth, with a flow rate lower than that of the present-day North Atlantic deep water (NADW). Southern-sourced deep waters most probably flowed northwards below 4000m depth into the North Atlantic basin and then southwards as a return flow between 2500 and 4000m depth. The flow rate of this southern-sourced deep water was likely larger than that of the modern Antarctic bottom water (AABW). Our results further show that during Heinrich stadial 2, the deep Atlantic was probably directly affected by a southern-sourced water mass below 2500m depth, while a slow, southward-flowing water mass originating from the North Atlantic likely influenced depths between 1500 and 2500m down to the equator. Article in Journal/Newspaper Antarc* Antarctic Greenland NADW North Atlantic Deep Water North Atlantic BORIS (Bern Open Repository and Information System, University of Bern) Antarctic Greenland Climate of the Past 12 11 2061 2075 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
550 Earth sciences & geology |
spellingShingle |
550 Earth sciences & geology Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier Pichat, Sylvain Jaccard, Samuel Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, François Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka) |
topic_facet |
550 Earth sciences & geology |
description |
We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Heinrich stadial 2 and three Greenland interstadials of the 20– 50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We show that the deep Atlantic circulation during these interstadials was very different from that of the Holocene. Northern-sourced waters likely circulated above 2500m depth, with a flow rate lower than that of the present-day North Atlantic deep water (NADW). Southern-sourced deep waters most probably flowed northwards below 4000m depth into the North Atlantic basin and then southwards as a return flow between 2500 and 4000m depth. The flow rate of this southern-sourced deep water was likely larger than that of the modern Antarctic bottom water (AABW). Our results further show that during Heinrich stadial 2, the deep Atlantic was probably directly affected by a southern-sourced water mass below 2500m depth, while a slow, southward-flowing water mass originating from the North Atlantic likely influenced depths between 1500 and 2500m down to the equator. |
format |
Article in Journal/Newspaper |
author |
Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier Pichat, Sylvain Jaccard, Samuel Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, François |
author_facet |
Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier Pichat, Sylvain Jaccard, Samuel Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, François |
author_sort |
Burckel, Pierre |
title |
Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka) |
title_short |
Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka) |
title_full |
Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka) |
title_fullStr |
Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka) |
title_full_unstemmed |
Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka) |
title_sort |
changes in the geometry and strength of the atlantic meridional overturning circulation during the last glacial (20–50 ka) |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://boris.unibe.ch/89955/1/Burckel%20et%20al.,%2016.pdf https://boris.unibe.ch/89955/ |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Greenland NADW North Atlantic Deep Water North Atlantic |
op_source |
Burckel, Pierre; Waelbroeck, Claire; Luo, Yiming; Roche, Didier; Pichat, Sylvain; Jaccard, Samuel; Gherardi, Jeanne; Govin, Aline; Lippold, Jörg; Thil, François (2016). Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka). Climate of the past, 12(11), pp. 2016-2017. Copernicus Publications 10.5194/cp-12-2061-2016 <http://dx.doi.org/10.5194/cp-12-2061-2016> |
op_relation |
https://boris.unibe.ch/89955/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-12-2061-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
11 |
container_start_page |
2061 |
op_container_end_page |
2075 |
_version_ |
1774713079926358016 |