Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2
International audience Abstract. The mid-Pliocene warm period (3.264–3.025 Ma) is the most recent geological period in which the atmospheric CO2 concentration was approximately equal to the concentration we measure today (ca. 400 ppm). Sea surface temperature (SST) proxies indicate above-average war...
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
2023
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Online Access: | https://hal.science/hal-03933221 https://hal.science/hal-03933221/document https://hal.science/hal-03933221/file/cp-19-61-2023.pdf https://doi.org/10.5194/cp-19-61-2023 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Weiffenbach, Julia Baatsen, Michiel Dijkstra, Henk von der Heydt, Anna Abe-Ouchi, Ayako Brady, Esther Chan, Wing-Le Chandan, Deepak Chandler, Mark Contoux, Camille Feng, Ran Guo, Chuncheng Han, Zixuan Haywood, Alan Li, Qiang Li, Xiangyu Lohmann, Gerrit Lunt, Daniel Nisancioglu, Kerim Otto-Bliesner, Bette Peltier, W. Richard Ramstein, Gilles Sohl, Linda Stepanek, Christian Tan, Ning Tindall, Julia Williams, Charles Zhang, Qiong Zhang, Zhongshi Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Abstract. The mid-Pliocene warm period (3.264–3.025 Ma) is the most recent geological period in which the atmospheric CO2 concentration was approximately equal to the concentration we measure today (ca. 400 ppm). Sea surface temperature (SST) proxies indicate above-average warming over the North Atlantic in the mid-Pliocene with respect to the pre-industrial period, which may be linked to an intensified Atlantic Meridional Overturning Circulation (AMOC). Earlier results from the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2) show that the ensemble simulates a stronger AMOC in the mid-Pliocene than in the pre-industrial. However, no consistent relationship between the stronger mid-Pliocene AMOC and either the Atlantic northward ocean heat transport (OHT) or average North Atlantic SSTs has been found. In this study, we look further into the drivers and consequences of a stronger AMOC in mid-Pliocene compared to pre-industrial simulations in PlioMIP2. We find that all model simulations with a closed Bering Strait and Canadian Archipelago show reduced freshwater transport from the Arctic Ocean into the North Atlantic. This contributes to an increase in salinity in the subpolar North Atlantic and Labrador Sea that can be linked to the stronger AMOC in the mid-Pliocene. To investigate the dynamics behind the ensemble's variable response of the total Atlantic OHT to the stronger AMOC, we separate the Atlantic OHT into two components associated with either the overturning circulation or the wind-driven gyre circulation. While the ensemble mean of the overturning component is increased significantly in magnitude in the mid-Pliocene, it is partly compensated by a reduction in the gyre component in the northern subtropical gyre region. This indicates that the lack of relationship between the total OHT and AMOC is due to changes in OHT by the subtropical gyre. The overturning and gyre components should therefore be considered separately to gain a more complete understanding of the OHT ... |
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) Modélisation du climat (CLIM) 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)) |
format |
Article in Journal/Newspaper |
author |
Weiffenbach, Julia Baatsen, Michiel Dijkstra, Henk von der Heydt, Anna Abe-Ouchi, Ayako Brady, Esther Chan, Wing-Le Chandan, Deepak Chandler, Mark Contoux, Camille Feng, Ran Guo, Chuncheng Han, Zixuan Haywood, Alan Li, Qiang Li, Xiangyu Lohmann, Gerrit Lunt, Daniel Nisancioglu, Kerim Otto-Bliesner, Bette Peltier, W. Richard Ramstein, Gilles Sohl, Linda Stepanek, Christian Tan, Ning Tindall, Julia Williams, Charles Zhang, Qiong Zhang, Zhongshi |
author_facet |
Weiffenbach, Julia Baatsen, Michiel Dijkstra, Henk von der Heydt, Anna Abe-Ouchi, Ayako Brady, Esther Chan, Wing-Le Chandan, Deepak Chandler, Mark Contoux, Camille Feng, Ran Guo, Chuncheng Han, Zixuan Haywood, Alan Li, Qiang Li, Xiangyu Lohmann, Gerrit Lunt, Daniel Nisancioglu, Kerim Otto-Bliesner, Bette Peltier, W. Richard Ramstein, Gilles Sohl, Linda Stepanek, Christian Tan, Ning Tindall, Julia Williams, Charles Zhang, Qiong Zhang, Zhongshi |
author_sort |
Weiffenbach, Julia |
title |
Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 |
title_short |
Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 |
title_full |
Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 |
title_fullStr |
Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 |
title_full_unstemmed |
Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 |
title_sort |
unraveling the mechanisms and implications of a stronger mid-pliocene atlantic meridional overturning circulation (amoc) in pliomip2 |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-03933221 https://hal.science/hal-03933221/document https://hal.science/hal-03933221/file/cp-19-61-2023.pdf https://doi.org/10.5194/cp-19-61-2023 |
genre |
Arctic Arctic Ocean Bering Strait Canadian Archipelago Labrador Sea North Atlantic |
genre_facet |
Arctic Arctic Ocean Bering Strait Canadian Archipelago Labrador Sea North Atlantic |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03933221 Climate of the Past, 2023, 19 (1), pp.61-85. ⟨10.5194/cp-19-61-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-61-2023 hal-03933221 https://hal.science/hal-03933221 https://hal.science/hal-03933221/document https://hal.science/hal-03933221/file/cp-19-61-2023.pdf doi:10.5194/cp-19-61-2023 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-19-61-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
1 |
container_start_page |
61 |
op_container_end_page |
85 |
_version_ |
1797579278830796800 |
spelling |
ftinsu:oai:HAL:hal-03933221v1 2024-04-28T08:12:24+00:00 Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 Weiffenbach, Julia Baatsen, Michiel Dijkstra, Henk von der Heydt, Anna Abe-Ouchi, Ayako Brady, Esther Chan, Wing-Le Chandan, Deepak Chandler, Mark Contoux, Camille Feng, Ran Guo, Chuncheng Han, Zixuan Haywood, Alan Li, Qiang Li, Xiangyu Lohmann, Gerrit Lunt, Daniel Nisancioglu, Kerim Otto-Bliesner, Bette Peltier, W. Richard Ramstein, Gilles Sohl, Linda Stepanek, Christian Tan, Ning Tindall, Julia Williams, Charles Zhang, Qiong Zhang, Zhongshi 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) Modélisation du climat (CLIM) 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)) 2023 https://hal.science/hal-03933221 https://hal.science/hal-03933221/document https://hal.science/hal-03933221/file/cp-19-61-2023.pdf https://doi.org/10.5194/cp-19-61-2023 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-61-2023 hal-03933221 https://hal.science/hal-03933221 https://hal.science/hal-03933221/document https://hal.science/hal-03933221/file/cp-19-61-2023.pdf doi:10.5194/cp-19-61-2023 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03933221 Climate of the Past, 2023, 19 (1), pp.61-85. ⟨10.5194/cp-19-61-2023⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.5194/cp-19-61-2023 2024-04-05T00:30:24Z International audience Abstract. The mid-Pliocene warm period (3.264–3.025 Ma) is the most recent geological period in which the atmospheric CO2 concentration was approximately equal to the concentration we measure today (ca. 400 ppm). Sea surface temperature (SST) proxies indicate above-average warming over the North Atlantic in the mid-Pliocene with respect to the pre-industrial period, which may be linked to an intensified Atlantic Meridional Overturning Circulation (AMOC). Earlier results from the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2) show that the ensemble simulates a stronger AMOC in the mid-Pliocene than in the pre-industrial. However, no consistent relationship between the stronger mid-Pliocene AMOC and either the Atlantic northward ocean heat transport (OHT) or average North Atlantic SSTs has been found. In this study, we look further into the drivers and consequences of a stronger AMOC in mid-Pliocene compared to pre-industrial simulations in PlioMIP2. We find that all model simulations with a closed Bering Strait and Canadian Archipelago show reduced freshwater transport from the Arctic Ocean into the North Atlantic. This contributes to an increase in salinity in the subpolar North Atlantic and Labrador Sea that can be linked to the stronger AMOC in the mid-Pliocene. To investigate the dynamics behind the ensemble's variable response of the total Atlantic OHT to the stronger AMOC, we separate the Atlantic OHT into two components associated with either the overturning circulation or the wind-driven gyre circulation. While the ensemble mean of the overturning component is increased significantly in magnitude in the mid-Pliocene, it is partly compensated by a reduction in the gyre component in the northern subtropical gyre region. This indicates that the lack of relationship between the total OHT and AMOC is due to changes in OHT by the subtropical gyre. The overturning and gyre components should therefore be considered separately to gain a more complete understanding of the OHT ... Article in Journal/Newspaper Arctic Arctic Ocean Bering Strait Canadian Archipelago Labrador Sea North Atlantic Institut national des sciences de l'Univers: HAL-INSU Climate of the Past 19 1 61 85 |