Atlantic circulation changes across a stadial-interstadial transition
ABSTRACT: 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 delta...
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Online Access: | http://hdl.handle.net/10400.9/4144 https://doi.org/10.5194/cp-19-901-2023 |
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ftlneg:oai:repositorio.lneg.pt:10400.9/4144 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 Riveiros, Natalia Vazquez Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marches, Elodie Lebreiro, Susana Nave, Silvia 2023-09-18T15:52:28Z http://hdl.handle.net/10400.9/4144 https://doi.org/10.5194/cp-19-901-2023 eng eng Copernicus Publications Research Council of Norway (RNC - KLIMAFORSK contract nº 326603/E10) Waelbroeck, Claire. et.al - Atlantic circulation changes across a stadial-interstadial transition. In: Climate of the Past, 2023, vol. 19 (5), pp. 901-913 1814-9324 http://hdl.handle.net/10400.9/4144 doi:10.5194/cp-19-901-2023 1814-9332 openAccess http://creativecommons.org/licenses/by/4.0/ Deep-Water Ocean circulation North-Atlantic Nordic seas Carbon isotopes Storage article 2023 ftlneg https://doi.org/10.5194/cp-19-901-2023 2023-09-20T00:05:26Z ABSTRACT: 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 delta C-13 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 delta C-13 observed at the end of HS4 between similar to 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 delta C-13 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 similar to 40 % at 2000 m to similar to 80 % at 4000 m. Below similar to 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. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Nordic Seas North Atlantic Southern Ocean Laboratório Nacional de Energia e Geologia: Repositório Científico do LNEG Southern Ocean Climate of the Past 19 5 901 913 |
institution |
Open Polar |
collection |
Laboratório Nacional de Energia e Geologia: Repositório Científico do LNEG |
op_collection_id |
ftlneg |
language |
English |
topic |
Deep-Water Ocean circulation North-Atlantic Nordic seas Carbon isotopes Storage |
spellingShingle |
Deep-Water Ocean circulation North-Atlantic Nordic seas Carbon isotopes Storage Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Riveiros, Natalia Vazquez Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marches, Elodie Lebreiro, Susana Nave, Silvia Atlantic circulation changes across a stadial-interstadial transition |
topic_facet |
Deep-Water Ocean circulation North-Atlantic Nordic seas Carbon isotopes Storage |
description |
ABSTRACT: 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 delta C-13 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 delta C-13 observed at the end of HS4 between similar to 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 delta C-13 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 similar to 40 % at 2000 m to similar to 80 % at 4000 m. Below similar to 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. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Riveiros, Natalia Vazquez Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marches, Elodie Lebreiro, Susana Nave, Silvia |
author_facet |
Waelbroeck, Claire Tjiputra, Jerry Guo, Chuncheng Nisancioglu, Kerim H. Jansen, Eystein Riveiros, Natalia Vazquez Toucanne, Samuel Eynaud, Frédérique Rossignol, Linda Dewilde, Fabien Marches, 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 Publications |
publishDate |
2023 |
url |
http://hdl.handle.net/10400.9/4144 https://doi.org/10.5194/cp-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_relation |
Research Council of Norway (RNC - KLIMAFORSK contract nº 326603/E10) Waelbroeck, Claire. et.al - Atlantic circulation changes across a stadial-interstadial transition. In: Climate of the Past, 2023, vol. 19 (5), pp. 901-913 1814-9324 http://hdl.handle.net/10400.9/4144 doi:10.5194/cp-19-901-2023 1814-9332 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
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_ |
1779317028746690560 |