Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation
The timing and magnitude of millennial-scale thermal oscillation in the equatorial Atlantic during the last glacial and marine isotope stage 3 have been perceived as merely a response to meltwater-induced perturbations of the northern high latitude climate. The relatively asymmetric distribution of...
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ftarchimer:oai:archimer.ifremer.fr:37696 2023-05-15T13:50:50+02:00 Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation Weldeab, S. 2012 application/pdf https://archimer.ifremer.fr/doc/00266/37696/36965.pdf https://archimer.ifremer.fr/doc/00266/37696/36966.pdf https://doi.org/10.5194/cp-8-1705-2012 https://archimer.ifremer.fr/doc/00266/37696/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00266/37696/36965.pdf https://archimer.ifremer.fr/doc/00266/37696/36966.pdf doi:10.5194/cp-8-1705-2012 https://archimer.ifremer.fr/doc/00266/37696/ Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2012 , Vol. 8 , N. 5 , P. 1705-1716 text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.5194/cp-8-1705-2012 2021-09-23T20:26:12Z The timing and magnitude of millennial-scale thermal oscillation in the equatorial Atlantic during the last glacial and marine isotope stage 3 have been perceived as merely a response to meltwater-induced perturbations of the northern high latitude climate. The relatively asymmetric distribution of available temperature records has so far impeded testing whether this view is valid across the equatorial Atlantic. This study presents a centennially resolved record of Mg/Ca-derived sea surface temperature (SST) estimates from the eastern equatorial Atlantic (EEA) and a core top-based proxy validation. Multivariate analysis of the EEA core top data indicates that the Mg/Ca ratio varies by 8 +/- 2% per unit SST (degrees C) and 1 +/- 0.9% per unit salinity (psu) change, indicating that temperature is the most dominant factor controlling planktonic foraminiferal Mg/Ca variation. The EEA SST time series exhibits a close correlation between episodes of rapid equatorial surface water warming, the onset of massive meltwater inputs into the North Atlantic (Heinrich events H3-H6), and Antarctic climate changes, indicating that the EEA was very sensitive to millennial-scale bipolar oscillations. Rapid EEA SST rise between 0.8 degrees C and 2 degrees C, synchronous with the onset of Heinrich events, is consistent with the concept of tropical Atlantic warming in response to meltwater-induced perturbation of Atlantic meridional ocean circulation (AMOC). At variance with model results that suggest a basin-wide SST rise during and rapid surface cooling concomitant with the termination of Heinrich events, this study indicates persistently elevated EEA SST during and up to 2300 yr after the abrupt termination of Heinrich events. This study emphasizes that changes in wind-induced low-latitude zonal surface currents were crucial in shaping the spatial heterogeneity and duration of equatorial Atlantic surface water warmth. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Climate of the Past 8 5 1705 1716 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The timing and magnitude of millennial-scale thermal oscillation in the equatorial Atlantic during the last glacial and marine isotope stage 3 have been perceived as merely a response to meltwater-induced perturbations of the northern high latitude climate. The relatively asymmetric distribution of available temperature records has so far impeded testing whether this view is valid across the equatorial Atlantic. This study presents a centennially resolved record of Mg/Ca-derived sea surface temperature (SST) estimates from the eastern equatorial Atlantic (EEA) and a core top-based proxy validation. Multivariate analysis of the EEA core top data indicates that the Mg/Ca ratio varies by 8 +/- 2% per unit SST (degrees C) and 1 +/- 0.9% per unit salinity (psu) change, indicating that temperature is the most dominant factor controlling planktonic foraminiferal Mg/Ca variation. The EEA SST time series exhibits a close correlation between episodes of rapid equatorial surface water warming, the onset of massive meltwater inputs into the North Atlantic (Heinrich events H3-H6), and Antarctic climate changes, indicating that the EEA was very sensitive to millennial-scale bipolar oscillations. Rapid EEA SST rise between 0.8 degrees C and 2 degrees C, synchronous with the onset of Heinrich events, is consistent with the concept of tropical Atlantic warming in response to meltwater-induced perturbation of Atlantic meridional ocean circulation (AMOC). At variance with model results that suggest a basin-wide SST rise during and rapid surface cooling concomitant with the termination of Heinrich events, this study indicates persistently elevated EEA SST during and up to 2300 yr after the abrupt termination of Heinrich events. This study emphasizes that changes in wind-induced low-latitude zonal surface currents were crucial in shaping the spatial heterogeneity and duration of equatorial Atlantic surface water warmth. |
format |
Article in Journal/Newspaper |
author |
Weldeab, S. |
spellingShingle |
Weldeab, S. Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation |
author_facet |
Weldeab, S. |
author_sort |
Weldeab, S. |
title |
Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation |
title_short |
Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation |
title_full |
Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation |
title_fullStr |
Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation |
title_full_unstemmed |
Timing and magnitude of equatorial Atlantic surface warming during the last glacial bipolar oscillation |
title_sort |
timing and magnitude of equatorial atlantic surface warming during the last glacial bipolar oscillation |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00266/37696/36965.pdf https://archimer.ifremer.fr/doc/00266/37696/36966.pdf https://doi.org/10.5194/cp-8-1705-2012 https://archimer.ifremer.fr/doc/00266/37696/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_source |
Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2012 , Vol. 8 , N. 5 , P. 1705-1716 |
op_relation |
https://archimer.ifremer.fr/doc/00266/37696/36965.pdf https://archimer.ifremer.fr/doc/00266/37696/36966.pdf doi:10.5194/cp-8-1705-2012 https://archimer.ifremer.fr/doc/00266/37696/ |
op_rights |
Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-8-1705-2012 |
container_title |
Climate of the Past |
container_volume |
8 |
container_issue |
5 |
container_start_page |
1705 |
op_container_end_page |
1716 |
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1766254140691841024 |