Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka)
International audience We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Hein-rich stadial 2 and three Greenland interstadials of the 20– 50 ka period based on the comparison of new and published sedimentary 231 Pa / 230 Th data with simulated sed...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Subjects: | |
Online Access: | https://hal.science/hal-01587574 https://hal.science/hal-01587574/document https://hal.science/hal-01587574/file/cp-12-2061-2016.pdf https://doi.org/10.5194/cp-12-2061-2016 |
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HAL Lyon 1 (University Claude Bernard Lyon 1) |
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language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier M. Pichat, Sylvain Jaccard, Samuel L. 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 |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Hein-rich stadial 2 and three Greenland interstadials of the 20– 50 ka period based on the comparison of new and published sedimentary 231 Pa / 230 Th data with simulated sedimentary 231 Pa / 230 Th. 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. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Department of Oceanography Halifax (DO) Dalhousie University Halifax Vrije Universiteit Amsterdam Amsterdam (VU) Modélisation du climat (CLIM) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Oeschger Centre for Climate Change Research (OCCR) Universität Bern / University of Bern (UNIBE) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Climat et Magnétisme (CLIMAG) Géochrononologie Traceurs Archéométrie (GEOTRAC) |
format |
Article in Journal/Newspaper |
author |
Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier M. Pichat, Sylvain Jaccard, Samuel L. Gherardi, Jeanne Govin, Aline Lippold, Jörg Thil, François |
author_facet |
Burckel, Pierre Waelbroeck, Claire Luo, Yiming Roche, Didier M. Pichat, Sylvain Jaccard, Samuel L. 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 |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01587574 https://hal.science/hal-01587574/document https://hal.science/hal-01587574/file/cp-12-2061-2016.pdf https://doi.org/10.5194/cp-12-2061-2016 |
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 |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-01587574 Climate of the Past, 2016, 12 (11), pp.2061-2075. ⟨10.5194/cp-12-2061-2016⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-12-2061-2016 hal-01587574 https://hal.science/hal-01587574 https://hal.science/hal-01587574/document https://hal.science/hal-01587574/file/cp-12-2061-2016.pdf doi:10.5194/cp-12-2061-2016 |
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_ |
1802651604997898240 |
spelling |
ftunivlyon1:oai:HAL:hal-01587574v1 2024-06-23T07:47:30+00:00 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, François Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Department of Oceanography Halifax (DO) Dalhousie University Halifax Vrije Universiteit Amsterdam Amsterdam (VU) Modélisation du climat (CLIM) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Oeschger Centre for Climate Change Research (OCCR) Universität Bern / University of Bern (UNIBE) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Climat et Magnétisme (CLIMAG) Géochrononologie Traceurs Archéométrie (GEOTRAC) 2016 https://hal.science/hal-01587574 https://hal.science/hal-01587574/document https://hal.science/hal-01587574/file/cp-12-2061-2016.pdf https://doi.org/10.5194/cp-12-2061-2016 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-12-2061-2016 hal-01587574 https://hal.science/hal-01587574 https://hal.science/hal-01587574/document https://hal.science/hal-01587574/file/cp-12-2061-2016.pdf doi:10.5194/cp-12-2061-2016 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-01587574 Climate of the Past, 2016, 12 (11), pp.2061-2075. ⟨10.5194/cp-12-2061-2016⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2016 ftunivlyon1 https://doi.org/10.5194/cp-12-2061-2016 2024-05-27T14:44:16Z International audience We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Hein-rich stadial 2 and three Greenland interstadials of the 20– 50 ka period based on the comparison of new and published sedimentary 231 Pa / 230 Th data with simulated sedimentary 231 Pa / 230 Th. 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. Article in Journal/Newspaper Antarc* Antarctic Greenland NADW North Atlantic Deep Water North Atlantic HAL Lyon 1 (University Claude Bernard Lyon 1) Antarctic Greenland Climate of the Past 12 11 2061 2075 |