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 δ 13 C changes a...
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Online Access: | https://doi.org/10.5194/cp-19-901-2023 https://cp.copernicus.org/articles/19/901/2023/ |
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ftcopernicus:oai:publications.copernicus.org:cp107377 2023-06-11T04:14:13+02:00 Atlantic circulation changes across a stadial–interstadial transition Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Vázquez Riveiros, Natalia Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marchès, Elodie Lebreiro, Susana Nave, Silvia 2023-05-04 application/pdf https://doi.org/10.5194/cp-19-901-2023 https://cp.copernicus.org/articles/19/901/2023/ eng eng doi:10.5194/cp-19-901-2023 https://cp.copernicus.org/articles/19/901/2023/ eISSN: 1814-9332 Text 2023 ftcopernicus https://doi.org/10.5194/cp-19-901-2023 2023-05-08T16:23:11Z 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 δ 13 C 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 δ 13 C 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 δ 13 C 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 compared to during 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. Text Nordic Seas North Atlantic Southern Ocean Copernicus Publications: E-Journals Southern Ocean Climate of the Past 19 5 901 913 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
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 δ 13 C 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 δ 13 C 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 δ 13 C 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 compared to during 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 |
Text |
author |
Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Vázquez 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 Vázquez 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 Vázquez 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 |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-901-2023 https://cp.copernicus.org/articles/19/901/2023/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Nordic Seas North Atlantic Southern Ocean |
genre_facet |
Nordic Seas North Atlantic Southern Ocean |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-19-901-2023 https://cp.copernicus.org/articles/19/901/2023/ |
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 |
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1768392078845280256 |