The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison
International audience To investigate the dynamics of the Atlantic meridional overturning circulation (AMOC) on timescales longer than the observational records, model-data comparisons of past AMOC variability are imperative. However, this remains challenging because of dissimilarities between diffe...
Published in: | Paleoceanography |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Online Access: | https://hal.science/hal-01806253 https://hal.science/hal-01806253/document https://hal.science/hal-01806253/file/Thornalley_Bakker_et_al-2015-Paleoceanography.pdf https://doi.org/10.1002/2015PA002776 |
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ftuniparissaclay:oai:HAL:hal-01806253v1 |
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Open Polar |
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Archives ouvertes de Paris-Saclay |
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ftuniparissaclay |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Bakker, Pepijn Govin, Aline Thornalley, David Roche, Didier M. Renssen, Hans The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience To investigate the dynamics of the Atlantic meridional overturning circulation (AMOC) on timescales longer than the observational records, model-data comparisons of past AMOC variability are imperative. However, this remains challenging because of dissimilarities between different proxy-based AMOC tracers and the difficulty of comparing these to model output. We present an iLOVECLIM simulation with tuned AMOC evolution and focus on AMOC tracers that are directly comparable to reconstructions: flow speeds and δ 13 C. We deduce their driving factors and show that they yield different but complementary information about AMOC changes. Simulated flow speed changes are only linked to AMOC changes in regions bathed by North Atlantic Deep Water; however, in those regions they do provide details on vertical migration and thickness changes of the water masses. Simulated δ 13 C changes in the North Atlantic Deep Water region are again related to AMOC changes. Yet in regions bathed by Antarctic Bottom Water or Antarctic Intermediate Water, the δ 13 C evolution is driven by Southern Hemisphere source water δ 13 C changes, while in the Nordic Seas and the two major overflow regions it is driven by Northern Hemisphere source water δ 13 C changes. This shows that AMOC changes are not necessarily recorded by δ 13 C and stresses the need for combining both tracers in paleoclimate studies. A preliminary model-data comparison for Last Interglacial flow speeds and δ 13 C changes in the Deep Western Boundary Current shows that this integrated approach is far from straightforward and currently inconclusive on the Last Interglacial AMOC evolution. Nonetheless, the approach yields potential for more direct and in-depth model-data comparisons of past AMOC changes. |
author2 |
Vrije Universiteit Amsterdam Amsterdam (VU) 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) Climat et Magnétisme (CLIMAG) 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)) University College of London London (UCL) Modélisation du climat (CLIM) |
format |
Article in Journal/Newspaper |
author |
Bakker, Pepijn Govin, Aline Thornalley, David Roche, Didier M. Renssen, Hans |
author_facet |
Bakker, Pepijn Govin, Aline Thornalley, David Roche, Didier M. Renssen, Hans |
author_sort |
Bakker, Pepijn |
title |
The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison |
title_short |
The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison |
title_full |
The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison |
title_fullStr |
The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison |
title_full_unstemmed |
The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison |
title_sort |
evolution of deep-ocean flow speeds and δ 13 c under large changes in the atlantic overturning circulation: toward a more direct model-data comparison |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01806253 https://hal.science/hal-01806253/document https://hal.science/hal-01806253/file/Thornalley_Bakker_et_al-2015-Paleoceanography.pdf https://doi.org/10.1002/2015PA002776 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Nordic Seas North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Nordic Seas North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01806253 Paleoceanography, 2015, 30 (2), pp.95-117. ⟨10.1002/2015PA002776⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002776 hal-01806253 https://hal.science/hal-01806253 https://hal.science/hal-01806253/document https://hal.science/hal-01806253/file/Thornalley_Bakker_et_al-2015-Paleoceanography.pdf doi:10.1002/2015PA002776 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015PA002776 |
container_title |
Paleoceanography |
container_volume |
30 |
container_issue |
2 |
container_start_page |
95 |
op_container_end_page |
117 |
_version_ |
1802012284326772736 |
spelling |
ftuniparissaclay:oai:HAL:hal-01806253v1 2024-06-16T07:35:35+00:00 The evolution of deep-ocean flow speeds and δ 13 C under large changes in the Atlantic overturning circulation: Toward a more direct model-data comparison Bakker, Pepijn Govin, Aline Thornalley, David Roche, Didier M. Renssen, Hans Vrije Universiteit Amsterdam Amsterdam (VU) 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) Climat et Magnétisme (CLIMAG) 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)) University College of London London (UCL) Modélisation du climat (CLIM) 2015 https://hal.science/hal-01806253 https://hal.science/hal-01806253/document https://hal.science/hal-01806253/file/Thornalley_Bakker_et_al-2015-Paleoceanography.pdf https://doi.org/10.1002/2015PA002776 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002776 hal-01806253 https://hal.science/hal-01806253 https://hal.science/hal-01806253/document https://hal.science/hal-01806253/file/Thornalley_Bakker_et_al-2015-Paleoceanography.pdf doi:10.1002/2015PA002776 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01806253 Paleoceanography, 2015, 30 (2), pp.95-117. ⟨10.1002/2015PA002776⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2015 ftuniparissaclay https://doi.org/10.1002/2015PA002776 2024-05-17T00:07:34Z International audience To investigate the dynamics of the Atlantic meridional overturning circulation (AMOC) on timescales longer than the observational records, model-data comparisons of past AMOC variability are imperative. However, this remains challenging because of dissimilarities between different proxy-based AMOC tracers and the difficulty of comparing these to model output. We present an iLOVECLIM simulation with tuned AMOC evolution and focus on AMOC tracers that are directly comparable to reconstructions: flow speeds and δ 13 C. We deduce their driving factors and show that they yield different but complementary information about AMOC changes. Simulated flow speed changes are only linked to AMOC changes in regions bathed by North Atlantic Deep Water; however, in those regions they do provide details on vertical migration and thickness changes of the water masses. Simulated δ 13 C changes in the North Atlantic Deep Water region are again related to AMOC changes. Yet in regions bathed by Antarctic Bottom Water or Antarctic Intermediate Water, the δ 13 C evolution is driven by Southern Hemisphere source water δ 13 C changes, while in the Nordic Seas and the two major overflow regions it is driven by Northern Hemisphere source water δ 13 C changes. This shows that AMOC changes are not necessarily recorded by δ 13 C and stresses the need for combining both tracers in paleoclimate studies. A preliminary model-data comparison for Last Interglacial flow speeds and δ 13 C changes in the Deep Western Boundary Current shows that this integrated approach is far from straightforward and currently inconclusive on the Last Interglacial AMOC evolution. Nonetheless, the approach yields potential for more direct and in-depth model-data comparisons of past AMOC changes. Article in Journal/Newspaper Antarc* Antarctic Nordic Seas North Atlantic Deep Water North Atlantic Archives ouvertes de Paris-Saclay Antarctic Paleoceanography 30 2 95 117 |