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 2050 ka period based on the comparison of new and published sedimentary Pa-231/Th-230 data with simulated sedimentary Pa-231/Th-230. We s...
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Online Access: | https://doi.org/10.5194/cp-12-2061-2016 https://archimer.ifremer.fr/doc/00421/53212/54867.pdf https://archimer.ifremer.fr/doc/00421/53212/54868.pdf https://archimer.ifremer.fr/doc/00421/53212/54869.pdf https://archimer.ifremer.fr/doc/00421/53212/54870.xlsx |
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fttriple:oai:gotriple.eu:O3GzcrKZ0_437mKZmQgAQ 2023-05-15T13:36:52+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 M. Pichat, Sylvain Jaccard, Samuel L. Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, Francois https://doi.org/10.5194/cp-12-2061-2016 https://archimer.ifremer.fr/doc/00421/53212/54867.pdf https://archimer.ifremer.fr/doc/00421/53212/54868.pdf https://archimer.ifremer.fr/doc/00421/53212/54869.pdf https://archimer.ifremer.fr/doc/00421/53212/54870.xlsx en eng Copernicus Gesellschaft Mbh doi:10.5194/cp-12-2061-2016 10670/1.f9i67a 10670/1.ikpjm9 https://archimer.ifremer.fr/doc/00421/53212/54867.pdf https://archimer.ifremer.fr/doc/00421/53212/54868.pdf https://archimer.ifremer.fr/doc/00421/53212/54869.pdf https://archimer.ifremer.fr/doc/00421/53212/54870.xlsx lic_creative-commons other Archimer, archive institutionnelle de l'Ifremer Geographica Helvetica - geography Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2016-11 , Vol. 12 , N. 11 , P. 2061-2075 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Other https://vocabularies.coar-repositories.org/resource_types/c_1843/ fttriple https://doi.org/10.5194/cp-12-2061-2016 2023-01-22T17:54:47Z We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Heinrich stadial 2 and three Greenland interstadials of the 2050 ka period based on the comparison of new and published sedimentary Pa-231/Th-230 data with simulated sedimentary Pa-231/Th-230. We show that the deep Atlantic circulation during these interstadials was very different from that of the Holocene. Northern-sourced waters likely circulated above 2500 m 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 4000 m depth into the North Atlantic basin and then southwards as a return flow between 2500 and 4000 m 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 2500 m depth, while a slow, southward-flowing water mass originating from the North Atlantic likely influenced depths between 1500 and 2500 m down to the equator. Text Antarc* Antarctic Greenland NADW North Atlantic Deep Water North Atlantic Unknown Antarctic Greenland Climate of the Past 12 11 2061 2075 |
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English |
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envir geo |
spellingShingle |
envir geo Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier M. Pichat, Sylvain Jaccard, Samuel L. Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, Francois Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20-50 ka) |
topic_facet |
envir geo |
description |
We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Heinrich stadial 2 and three Greenland interstadials of the 2050 ka period based on the comparison of new and published sedimentary Pa-231/Th-230 data with simulated sedimentary Pa-231/Th-230. We show that the deep Atlantic circulation during these interstadials was very different from that of the Holocene. Northern-sourced waters likely circulated above 2500 m 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 4000 m depth into the North Atlantic basin and then southwards as a return flow between 2500 and 4000 m 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 2500 m depth, while a slow, southward-flowing water mass originating from the North Atlantic likely influenced depths between 1500 and 2500 m down to the equator. |
format |
Text |
author |
Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier M. Pichat, Sylvain Jaccard, Samuel L. Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, Francois |
author_facet |
Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier M. Pichat, Sylvain Jaccard, Samuel L. Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, Francois |
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 Gesellschaft Mbh |
url |
https://doi.org/10.5194/cp-12-2061-2016 https://archimer.ifremer.fr/doc/00421/53212/54867.pdf https://archimer.ifremer.fr/doc/00421/53212/54868.pdf https://archimer.ifremer.fr/doc/00421/53212/54869.pdf https://archimer.ifremer.fr/doc/00421/53212/54870.xlsx |
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 |
Archimer, archive institutionnelle de l'Ifremer Geographica Helvetica - geography Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2016-11 , Vol. 12 , N. 11 , P. 2061-2075 |
op_relation |
doi:10.5194/cp-12-2061-2016 10670/1.f9i67a 10670/1.ikpjm9 https://archimer.ifremer.fr/doc/00421/53212/54867.pdf https://archimer.ifremer.fr/doc/00421/53212/54868.pdf https://archimer.ifremer.fr/doc/00421/53212/54869.pdf https://archimer.ifremer.fr/doc/00421/53212/54870.xlsx |
op_rights |
lic_creative-commons other |
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_ |
1766085189456363520 |