Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2
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 t...
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ftncar:oai:drupal-site.org:articles_26017 2023-05-15T15:15:09+02:00 Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 Weiffenbach, Julia E. (author) Baatsen, Michiel L. J. (author) Dijkstra, Henk A. (author) von der Heydt, Anna S. (author) Abe-Ouchi, Ayako (author) Brady, Esther C. (author) Chan, Wing-Le (author) Chandan, Deepak (author) Chandler, Mark A. (author) Contoux, Camille (author) Feng, Ran (author) Guo, Chuncheng (author) Han, Zixuan (author) Haywood, Alan M. (author) Li, Qiang (author) Li, Xiangyu (author) Lohmann, Gerrit (author) Lunt, Daniel J. (author) Nisancioglu, Kerim H. (author) Otto-Bliesner, Bette L. (author) Peltier, W. Richard (author) Ramstein, Gilles (author) Sohl, Linda E. (author) Stepanek, Christian (author) Tan, Ning (author) Tindall, Julia C. (author) Williams, Charles J. R. (author) Zhang, Qiong (author) Zhang, Zhongshi (author) 2023-01-09 https://doi.org/10.5194/cp-19-61-2023 en eng Climate of the Past--Clim. Past--1814-9332 Sea surface temperature anomalies for Pliocene interglacial KM5c (PlioVAR)--10.1594/PANGAEA.911847 jweiffenbach/PlioMIP2-AMOC: v1.1--10.5281/zenodo.7288756 NOAA Extended Reconstructed Sea Surface Temperature (ERSST), Version 5--10.7289/V5T72FNM articles:26017 doi:10.5194/cp-19-61-2023 ark:/85065/d7br8x2x Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. CC-BY-NC article Text 2023 ftncar https://doi.org/10.5194/cp-19-61-2023 2023-02-20T19:00:28Z 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 response to a stronger mid-Pliocene ... Article in Journal/Newspaper Arctic Arctic Ocean Bering Strait Canadian Archipelago Labrador Sea North Atlantic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic Arctic Ocean Bering Strait Climate of the Past 19 1 61 85 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
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 response to a stronger mid-Pliocene ... |
author2 |
Weiffenbach, Julia E. (author) Baatsen, Michiel L. J. (author) Dijkstra, Henk A. (author) von der Heydt, Anna S. (author) Abe-Ouchi, Ayako (author) Brady, Esther C. (author) Chan, Wing-Le (author) Chandan, Deepak (author) Chandler, Mark A. (author) Contoux, Camille (author) Feng, Ran (author) Guo, Chuncheng (author) Han, Zixuan (author) Haywood, Alan M. (author) Li, Qiang (author) Li, Xiangyu (author) Lohmann, Gerrit (author) Lunt, Daniel J. (author) Nisancioglu, Kerim H. (author) Otto-Bliesner, Bette L. (author) Peltier, W. Richard (author) Ramstein, Gilles (author) Sohl, Linda E. (author) Stepanek, Christian (author) Tan, Ning (author) Tindall, Julia C. (author) Williams, Charles J. R. (author) Zhang, Qiong (author) Zhang, Zhongshi (author) |
format |
Article in Journal/Newspaper |
title |
Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2 |
spellingShingle |
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 |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-61-2023 |
geographic |
Arctic Arctic Ocean Bering Strait |
geographic_facet |
Arctic Arctic Ocean Bering Strait |
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_relation |
Climate of the Past--Clim. Past--1814-9332 Sea surface temperature anomalies for Pliocene interglacial KM5c (PlioVAR)--10.1594/PANGAEA.911847 jweiffenbach/PlioMIP2-AMOC: v1.1--10.5281/zenodo.7288756 NOAA Extended Reconstructed Sea Surface Temperature (ERSST), Version 5--10.7289/V5T72FNM articles:26017 doi:10.5194/cp-19-61-2023 ark:/85065/d7br8x2x |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_rightsnorm |
CC-BY-NC |
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 |
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1766345539730800640 |