Mechanisms of global ocean ventilation age change during the last deglaciation
Marine radiocarbon ( 14 C) is widely used to trace deep-ocean circulation, providing insight into the atmosphere–ocean exchange of CO 2 during the last deglaciation. Evidence shows a significantly depleted Δ 14 C in the glacial deep ocean, suggesting an increased ventilation age at the Last Glacial...
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ftdoajarticles:oai:doaj.org/article:2241ea8b18af4bb48f600880bb5db2c9 2024-09-15T17:45:36+00:00 Mechanisms of global ocean ventilation age change during the last deglaciation L. Li Z. Liu J. Du L. Wan J. Lu 2024-05-01T00:00:00Z https://doi.org/10.5194/cp-20-1161-2024 https://doaj.org/article/2241ea8b18af4bb48f600880bb5db2c9 EN eng Copernicus Publications https://cp.copernicus.org/articles/20/1161/2024/cp-20-1161-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-1161-2024 1814-9324 1814-9332 https://doaj.org/article/2241ea8b18af4bb48f600880bb5db2c9 Climate of the Past, Vol 20, Pp 1161-1175 (2024) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2024 ftdoajarticles https://doi.org/10.5194/cp-20-1161-2024 2024-08-05T17:49:23Z Marine radiocarbon ( 14 C) is widely used to trace deep-ocean circulation, providing insight into the atmosphere–ocean exchange of CO 2 during the last deglaciation. Evidence shows a significantly depleted Δ 14 C in the glacial deep ocean, suggesting an increased ventilation age at the Last Glacial Maximum (LGM). In this study, using two transient simulations with tracers of 14 C and ideal age (IAGE), we found that the oldest ventilation age is not observed at the LGM. In contrast, the models show a modestly younger ventilation age during the LGM compared to the present day. The global mean ventilation ages averaged below 1 km are approximately 800 (630) years and 930 (2000) years at the LGM and in the present day, respectively, in two simulations. This younger glacial ventilation age is mainly caused by the stronger glacial Antarctic Bottom Water (AABW) transport associated with sea ice expansion. Notably, the ocean ventilation age is significantly older predominantly in the deep Pacific during deglaciation compared to the age at the LGM, with global mean ventilation ages peaking at 1900 and 2200 years around 14–12 ka in two simulations, primarily due to the weakening of AABW transport. Article in Journal/Newspaper Antarc* Antarctic Sea ice Directory of Open Access Journals: DOAJ Articles Climate of the Past 20 5 1161 1175 |
institution |
Open Polar |
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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 L. Li Z. Liu J. Du L. Wan J. Lu Mechanisms of global ocean ventilation age change during the last deglaciation |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Marine radiocarbon ( 14 C) is widely used to trace deep-ocean circulation, providing insight into the atmosphere–ocean exchange of CO 2 during the last deglaciation. Evidence shows a significantly depleted Δ 14 C in the glacial deep ocean, suggesting an increased ventilation age at the Last Glacial Maximum (LGM). In this study, using two transient simulations with tracers of 14 C and ideal age (IAGE), we found that the oldest ventilation age is not observed at the LGM. In contrast, the models show a modestly younger ventilation age during the LGM compared to the present day. The global mean ventilation ages averaged below 1 km are approximately 800 (630) years and 930 (2000) years at the LGM and in the present day, respectively, in two simulations. This younger glacial ventilation age is mainly caused by the stronger glacial Antarctic Bottom Water (AABW) transport associated with sea ice expansion. Notably, the ocean ventilation age is significantly older predominantly in the deep Pacific during deglaciation compared to the age at the LGM, with global mean ventilation ages peaking at 1900 and 2200 years around 14–12 ka in two simulations, primarily due to the weakening of AABW transport. |
format |
Article in Journal/Newspaper |
author |
L. Li Z. Liu J. Du L. Wan J. Lu |
author_facet |
L. Li Z. Liu J. Du L. Wan J. Lu |
author_sort |
L. Li |
title |
Mechanisms of global ocean ventilation age change during the last deglaciation |
title_short |
Mechanisms of global ocean ventilation age change during the last deglaciation |
title_full |
Mechanisms of global ocean ventilation age change during the last deglaciation |
title_fullStr |
Mechanisms of global ocean ventilation age change during the last deglaciation |
title_full_unstemmed |
Mechanisms of global ocean ventilation age change during the last deglaciation |
title_sort |
mechanisms of global ocean ventilation age change during the last deglaciation |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/cp-20-1161-2024 https://doaj.org/article/2241ea8b18af4bb48f600880bb5db2c9 |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
Climate of the Past, Vol 20, Pp 1161-1175 (2024) |
op_relation |
https://cp.copernicus.org/articles/20/1161/2024/cp-20-1161-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-1161-2024 1814-9324 1814-9332 https://doaj.org/article/2241ea8b18af4bb48f600880bb5db2c9 |
op_doi |
https://doi.org/10.5194/cp-20-1161-2024 |
container_title |
Climate of the Past |
container_volume |
20 |
container_issue |
5 |
container_start_page |
1161 |
op_container_end_page |
1175 |
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1810493497777586176 |