A source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water age
Abstract This paper introduces the Benthic minus-weighted-Planktonic (BwP) age method to estimate the pure water age of the deep ocean. It combines radiocarbon data with water mass composition evolution in an ocean model under realistic surface forcings accounting for multiple water sources, marine...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-02-01
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| Series: | npj Climate and Atmospheric Science |
| Online Access: | https://doi.org/10.1038/s41612-025-00952-x |
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| author | Jinbo Du Sifan Gu Zhengyu Liu Lingwei Li Ning Zhao |
| author_facet | Jinbo Du Sifan Gu Zhengyu Liu Lingwei Li Ning Zhao |
| author_sort | Jinbo Du |
| collection | DOAJ |
| description | Abstract This paper introduces the Benthic minus-weighted-Planktonic (BwP) age method to estimate the pure water age of the deep ocean. It combines radiocarbon data with water mass composition evolution in an ocean model under realistic surface forcings accounting for multiple water sources, marine reservoir age, and the evolving atmospheric $${14\atop}C$$ 14 C content. Instead of using local planktonic radiocarbon age, the source water radiocarbon age is derived from global planktonic data weighted by their water mass contributions, with weights simulated by dye tracers. An iterative approach is used to account for the effect of the temporal variation of the atmospheric radiocarbon or the so-called projection age issue. In this ocean model, we demonstrate that our BwP age effectively reproduces the pure water age that results from the interior ocean circulation. Preliminary application to the North Pacific suggests that the pure water age at the Last Glacial Maximum (LGM) is not much older than today. |
| format | Article |
| id | doaj-art-e1f7937236a143e2a4eabb12f784a1aa |
| institution | OA Journals |
| issn | 2397-3722 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Climate and Atmospheric Science |
| spelling | doaj-art-e1f7937236a143e2a4eabb12f784a1aa2025-08-20T02:16:45ZengNature Portfolionpj Climate and Atmospheric Science2397-37222025-02-018111210.1038/s41612-025-00952-xA source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water ageJinbo Du0Sifan Gu1Zhengyu Liu2Lingwei Li3Ning Zhao4Department of Atmosphere and Oceanic Sciences, Peking UniversityKey Laboratory of Polar Ecosystem and Climate Change, Ministry of Education; Shanghai Key Laboratory of Polar Life and Environment Sciences; and School of Oceanography, Shanghai Jiao Tong UniversityAtmospheric Science Program, Department of Geography, The Ohio State UniversityAtmospheric Science Program, Department of Geography, The Ohio State UniversityState Key Laboratory of Estuarine and Coastal Research and School of Marine Sciences, East China Normal UniversityAbstract This paper introduces the Benthic minus-weighted-Planktonic (BwP) age method to estimate the pure water age of the deep ocean. It combines radiocarbon data with water mass composition evolution in an ocean model under realistic surface forcings accounting for multiple water sources, marine reservoir age, and the evolving atmospheric $${14\atop}C$$ 14 C content. Instead of using local planktonic radiocarbon age, the source water radiocarbon age is derived from global planktonic data weighted by their water mass contributions, with weights simulated by dye tracers. An iterative approach is used to account for the effect of the temporal variation of the atmospheric radiocarbon or the so-called projection age issue. In this ocean model, we demonstrate that our BwP age effectively reproduces the pure water age that results from the interior ocean circulation. Preliminary application to the North Pacific suggests that the pure water age at the Last Glacial Maximum (LGM) is not much older than today.https://doi.org/10.1038/s41612-025-00952-x |
| spellingShingle | Jinbo Du Sifan Gu Zhengyu Liu Lingwei Li Ning Zhao A source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water age npj Climate and Atmospheric Science |
| title | A source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water age |
| title_full | A source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water age |
| title_fullStr | A source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water age |
| title_full_unstemmed | A source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water age |
| title_short | A source-weighted Benthic minus Planktonic radiocarbon method for estimating pure ocean water age |
| title_sort | source weighted benthic minus planktonic radiocarbon method for estimating pure ocean water age |
| url | https://doi.org/10.1038/s41612-025-00952-x |
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