Atlantic circulation changes across a stadial-interstadial transition
We combine consistently dated benthic carbon isotopic records distributed over the entire Atlantic Ocean with numerical simulations performed by a glacial configuration of the Norwegian Earth System Model with active ocean biogeochemistry, in order to interpret the observed Cibicides δ13C changes at...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus GmbH
2023
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Online Access: | https://archimer.ifremer.fr/doc/00805/91721/97662.pdf https://archimer.ifremer.fr/doc/00805/91721/102259.pdf https://archimer.ifremer.fr/doc/00805/91721/102260.pdf https://archimer.ifremer.fr/doc/00805/91721/102261.pdf https://doi.org/10.5194/cp-19-901-2023 https://archimer.ifremer.fr/doc/00805/91721/ |
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ftarchimer:oai:archimer.ifremer.fr:91721 2023-10-09T21:53:43+02:00 Atlantic circulation changes across a stadial-interstadial transition Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Vazquez Riveiros, Natalia Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marchès, Elodie Lebreiro, Susana Nave, Silvia 2023-05 application/pdf https://archimer.ifremer.fr/doc/00805/91721/97662.pdf https://archimer.ifremer.fr/doc/00805/91721/102259.pdf https://archimer.ifremer.fr/doc/00805/91721/102260.pdf https://archimer.ifremer.fr/doc/00805/91721/102261.pdf https://doi.org/10.5194/cp-19-901-2023 https://archimer.ifremer.fr/doc/00805/91721/ eng eng Copernicus GmbH https://archimer.ifremer.fr/doc/00805/91721/97662.pdf https://archimer.ifremer.fr/doc/00805/91721/102259.pdf https://archimer.ifremer.fr/doc/00805/91721/102260.pdf https://archimer.ifremer.fr/doc/00805/91721/102261.pdf doi:10.5194/cp-19-901-2023 https://archimer.ifremer.fr/doc/00805/91721/ info:eu-repo/semantics/openAccess restricted use Climate Of The Past (1814-9324) (Copernicus GmbH), 2023-05 , Vol. 19 , N. 5 , P. 901-913 text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.5194/cp-19-901-2023 2023-09-12T22:51:10Z We combine consistently dated benthic carbon isotopic records distributed over the entire Atlantic Ocean with numerical simulations performed by a glacial configuration of the Norwegian Earth System Model with active ocean biogeochemistry, in order to interpret the observed Cibicides δ13C changes at the stadial-interstadial transition corresponding to the end of Heinrich Stadial 4 (HS4) in terms of ocean circulation and remineralization changes. We show that the marked increase in Cibicides δ13C observed at the end of HS4 between ~2000 and 4200 m in the Atlantic can be explained by changes in nutrient concentrations as simulated by the model in response to the halting of freshwater input in the high latitude glacial North Atlantic. Our model results show that this Cibicides δ13C signal is associated with changes in the ratio of southern-sourced (SSW) versus northern-sourced (NSW) water masses at the core sites, whereby SSW is replaced by NSW as a consequence of the resumption of deep water formation in the northern North Atlantic and Nordic Seas after the freshwater input is halted. Our results further suggest that the contribution of ocean circulation changes to this signal increases from ~40 % at 2000 m to ~80 % at 4000 m. Below ~4200 m, the model shows little ocean circulation change but an increase in remineralization across the transition marking the end of HS4. The simulated lower remineralization during stadials than interstadials is particularly pronounced in deep subantarctic sites, in agreement with the decrease in the export production of carbon to the deep Southern Ocean during stadials found in previous studies. Article in Journal/Newspaper Nordic Seas North Atlantic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Southern Ocean Climate of the Past 19 5 901 913 |
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 |
We combine consistently dated benthic carbon isotopic records distributed over the entire Atlantic Ocean with numerical simulations performed by a glacial configuration of the Norwegian Earth System Model with active ocean biogeochemistry, in order to interpret the observed Cibicides δ13C changes at the stadial-interstadial transition corresponding to the end of Heinrich Stadial 4 (HS4) in terms of ocean circulation and remineralization changes. We show that the marked increase in Cibicides δ13C observed at the end of HS4 between ~2000 and 4200 m in the Atlantic can be explained by changes in nutrient concentrations as simulated by the model in response to the halting of freshwater input in the high latitude glacial North Atlantic. Our model results show that this Cibicides δ13C signal is associated with changes in the ratio of southern-sourced (SSW) versus northern-sourced (NSW) water masses at the core sites, whereby SSW is replaced by NSW as a consequence of the resumption of deep water formation in the northern North Atlantic and Nordic Seas after the freshwater input is halted. Our results further suggest that the contribution of ocean circulation changes to this signal increases from ~40 % at 2000 m to ~80 % at 4000 m. Below ~4200 m, the model shows little ocean circulation change but an increase in remineralization across the transition marking the end of HS4. The simulated lower remineralization during stadials than interstadials is particularly pronounced in deep subantarctic sites, in agreement with the decrease in the export production of carbon to the deep Southern Ocean during stadials found in previous studies. |
format |
Article in Journal/Newspaper |
author |
Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Vazquez Riveiros, Natalia Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marchès, Elodie Lebreiro, Susana Nave, Silvia |
spellingShingle |
Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Vazquez Riveiros, Natalia Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marchès, Elodie Lebreiro, Susana Nave, Silvia Atlantic circulation changes across a stadial-interstadial transition |
author_facet |
Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Vazquez Riveiros, Natalia Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marchès, Elodie Lebreiro, Susana Nave, Silvia |
author_sort |
Waelbroeck, Claire |
title |
Atlantic circulation changes across a stadial-interstadial transition |
title_short |
Atlantic circulation changes across a stadial-interstadial transition |
title_full |
Atlantic circulation changes across a stadial-interstadial transition |
title_fullStr |
Atlantic circulation changes across a stadial-interstadial transition |
title_full_unstemmed |
Atlantic circulation changes across a stadial-interstadial transition |
title_sort |
atlantic circulation changes across a stadial-interstadial transition |
publisher |
Copernicus GmbH |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00805/91721/97662.pdf https://archimer.ifremer.fr/doc/00805/91721/102259.pdf https://archimer.ifremer.fr/doc/00805/91721/102260.pdf https://archimer.ifremer.fr/doc/00805/91721/102261.pdf https://doi.org/10.5194/cp-19-901-2023 https://archimer.ifremer.fr/doc/00805/91721/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Nordic Seas North Atlantic Southern Ocean |
genre_facet |
Nordic Seas North Atlantic Southern Ocean |
op_source |
Climate Of The Past (1814-9324) (Copernicus GmbH), 2023-05 , Vol. 19 , N. 5 , P. 901-913 |
op_relation |
https://archimer.ifremer.fr/doc/00805/91721/97662.pdf https://archimer.ifremer.fr/doc/00805/91721/102259.pdf https://archimer.ifremer.fr/doc/00805/91721/102260.pdf https://archimer.ifremer.fr/doc/00805/91721/102261.pdf doi:10.5194/cp-19-901-2023 https://archimer.ifremer.fr/doc/00805/91721/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/cp-19-901-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
5 |
container_start_page |
901 |
op_container_end_page |
913 |
_version_ |
1779317031152123904 |