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://doaj.org/article/5b09dac2df624ffb9c8df61f238822bb |
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ftdoajarticles:oai:doaj.org/article:5b09dac2df624ffb9c8df61f238822bb 2023-06-11T04:14:13+02:00 Atlantic circulation changes across a stadial–interstadial transition C. Waelbroeck J. Tjiputra C. Guo K. H. Nisancioglu E. Jansen N. Vázquez Riveiros S. Toucanne F. Eynaud L. Rossignol F. Dewilde E. Marchès S. Lebreiro S. Nave 2023-05-01T00:00:00Z https://doi.org/10.5194/cp-19-901-2023 https://doaj.org/article/5b09dac2df624ffb9c8df61f238822bb EN eng Copernicus Publications https://cp.copernicus.org/articles/19/901/2023/cp-19-901-2023.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-19-901-2023 1814-9324 1814-9332 https://doaj.org/article/5b09dac2df624ffb9c8df61f238822bb Climate of the Past, Vol 19, Pp 901-913 (2023) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2023 ftdoajarticles https://doi.org/10.5194/cp-19-901-2023 2023-05-07T00:33:00Z 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. Article in Journal/Newspaper Nordic Seas North Atlantic Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Climate of the Past 19 5 901 913 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. Waelbroeck J. Tjiputra C. Guo K. H. Nisancioglu E. Jansen N. Vázquez Riveiros S. Toucanne F. Eynaud L. Rossignol F. Dewilde E. Marchès S. Lebreiro S. Nave Atlantic circulation changes across a stadial–interstadial transition |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 |
Article in Journal/Newspaper |
author |
C. Waelbroeck J. Tjiputra C. Guo K. H. Nisancioglu E. Jansen N. Vázquez Riveiros S. Toucanne F. Eynaud L. Rossignol F. Dewilde E. Marchès S. Lebreiro S. Nave |
author_facet |
C. Waelbroeck J. Tjiputra C. Guo K. H. Nisancioglu E. Jansen N. Vázquez Riveiros S. Toucanne F. Eynaud L. Rossignol F. Dewilde E. Marchès S. Lebreiro S. Nave |
author_sort |
C. Waelbroeck |
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 |
https://doi.org/10.5194/cp-19-901-2023 https://doaj.org/article/5b09dac2df624ffb9c8df61f238822bb |
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, Vol 19, Pp 901-913 (2023) |
op_relation |
https://cp.copernicus.org/articles/19/901/2023/cp-19-901-2023.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-19-901-2023 1814-9324 1814-9332 https://doaj.org/article/5b09dac2df624ffb9c8df61f238822bb |
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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1768392084263272448 |