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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ftcopernicus:oai:publications.copernicus.org:cp115183 2024-09-15T17:42:01+00:00 Mechanisms of global ocean ventilation age change during the last deglaciation Li, Lingwei Liu, Zhengyu Du, Jinbo Wan, Lingfeng Lu, Jiuyou 2024-05-15 application/pdf https://doi.org/10.5194/cp-20-1161-2024 https://cp.copernicus.org/articles/20/1161/2024/ eng eng doi:10.5194/cp-20-1161-2024 https://cp.copernicus.org/articles/20/1161/2024/ eISSN: 1814-9332 Text 2024 ftcopernicus https://doi.org/10.5194/cp-20-1161-2024 2024-08-28T05:24:15Z 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. Text Antarc* Antarctic Sea ice Copernicus Publications: E-Journals Climate of the Past 20 5 1161 1175 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
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 |
Text |
author |
Li, Lingwei Liu, Zhengyu Du, Jinbo Wan, Lingfeng Lu, Jiuyou |
spellingShingle |
Li, Lingwei Liu, Zhengyu Du, Jinbo Wan, Lingfeng Lu, Jiuyou Mechanisms of global ocean ventilation age change during the last deglaciation |
author_facet |
Li, Lingwei Liu, Zhengyu Du, Jinbo Wan, Lingfeng Lu, Jiuyou |
author_sort |
Li, Lingwei |
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 |
publishDate |
2024 |
url |
https://doi.org/10.5194/cp-20-1161-2024 https://cp.copernicus.org/articles/20/1161/2024/ |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-20-1161-2024 https://cp.copernicus.org/articles/20/1161/2024/ |
op_doi |
https://doi.org/10.5194/cp-20-1161-2024 |
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Climate of the Past |
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20 |
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5 |
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1161 |
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1175 |
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1810488353923006464 |