Deglacial ventilation changes in the deep Southwest Pacific
Processes underlying changes in the oceanic carbon storage during the Last Glacial Maximum and the subsequent deglaciation are not fully understood. Here, we present a new high‐resolution radiocarbon reconstruction (expressed as δ14R) at the depth of the modern Lower Circumpolar Deep Water from the...
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fttriple:oai:gotriple.eu:10670/1.6d65hr 2023-05-15T13:44:51+02:00 Deglacial ventilation changes in the deep Southwest Pacific Dai, Yuhao Yu, Jimin Rafter, Patrick A. https://doi.org/10.1029/2020PA004172 https://archimer.ifremer.fr/doc/00676/78777/80955.pdf https://archimer.ifremer.fr/doc/00676/78777/80956.pdf https://archimer.ifremer.fr/doc/00676/78777/ en eng American Geophysical Union (AGU) doi:10.1029/2020PA004172 10670/1.6d65hr https://archimer.ifremer.fr/doc/00676/78777/80955.pdf https://archimer.ifremer.fr/doc/00676/78777/80956.pdf https://archimer.ifremer.fr/doc/00676/78777/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-02 , Vol. 36 , N. 2 , P. e2020PA004172 (11p.) geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1029/2020PA004172 2023-01-22T17:05:37Z Processes underlying changes in the oceanic carbon storage during the Last Glacial Maximum and the subsequent deglaciation are not fully understood. Here, we present a new high‐resolution radiocarbon reconstruction (expressed as δ14R) at the depth of the modern Lower Circumpolar Deep Water from the Pacific Sector of the Southern Ocean. Our record shows δ14R increases during Heinrich Stadial 1 and the Younger Dryas that agree with the deep‐to‐shallow transfer of old carbon in the Southern Ocean during these two periods. Our record also shows, for the first time, a clear ∼80‰ decline in δ14R during the Antarctic Cold Reversal (ACR), indicating the development of poorly ventilated conditions in the deep Southwest Pacific. These conditions are consistent with the increased Southern Ocean sea‐ice and associated stratification between Upper and Lower Circumpolar Deep Waters. This enhanced stratification in the deep South Pacific possibly facilitated greater carbon storage in the ocean interior during the ACR, effectively limiting oceanic CO2 release and contributing to the atmospheric CO2 plateau as observed in ice cores at that time. Text Antarc* Antarctic Sea ice Southern Ocean Unknown Antarctic Pacific Southern Ocean The Antarctic Paleoceanography and Paleoclimatology 36 2 |
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geo envir Dai, Yuhao Yu, Jimin Rafter, Patrick A. Deglacial ventilation changes in the deep Southwest Pacific |
topic_facet |
geo envir |
description |
Processes underlying changes in the oceanic carbon storage during the Last Glacial Maximum and the subsequent deglaciation are not fully understood. Here, we present a new high‐resolution radiocarbon reconstruction (expressed as δ14R) at the depth of the modern Lower Circumpolar Deep Water from the Pacific Sector of the Southern Ocean. Our record shows δ14R increases during Heinrich Stadial 1 and the Younger Dryas that agree with the deep‐to‐shallow transfer of old carbon in the Southern Ocean during these two periods. Our record also shows, for the first time, a clear ∼80‰ decline in δ14R during the Antarctic Cold Reversal (ACR), indicating the development of poorly ventilated conditions in the deep Southwest Pacific. These conditions are consistent with the increased Southern Ocean sea‐ice and associated stratification between Upper and Lower Circumpolar Deep Waters. This enhanced stratification in the deep South Pacific possibly facilitated greater carbon storage in the ocean interior during the ACR, effectively limiting oceanic CO2 release and contributing to the atmospheric CO2 plateau as observed in ice cores at that time. |
format |
Text |
author |
Dai, Yuhao Yu, Jimin Rafter, Patrick A. |
author_facet |
Dai, Yuhao Yu, Jimin Rafter, Patrick A. |
author_sort |
Dai, Yuhao |
title |
Deglacial ventilation changes in the deep Southwest Pacific |
title_short |
Deglacial ventilation changes in the deep Southwest Pacific |
title_full |
Deglacial ventilation changes in the deep Southwest Pacific |
title_fullStr |
Deglacial ventilation changes in the deep Southwest Pacific |
title_full_unstemmed |
Deglacial ventilation changes in the deep Southwest Pacific |
title_sort |
deglacial ventilation changes in the deep southwest pacific |
publisher |
American Geophysical Union (AGU) |
url |
https://doi.org/10.1029/2020PA004172 https://archimer.ifremer.fr/doc/00676/78777/80955.pdf https://archimer.ifremer.fr/doc/00676/78777/80956.pdf https://archimer.ifremer.fr/doc/00676/78777/ |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-02 , Vol. 36 , N. 2 , P. e2020PA004172 (11p.) |
op_relation |
doi:10.1029/2020PA004172 10670/1.6d65hr https://archimer.ifremer.fr/doc/00676/78777/80955.pdf https://archimer.ifremer.fr/doc/00676/78777/80956.pdf https://archimer.ifremer.fr/doc/00676/78777/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2020PA004172 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
2 |
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1766207674754531328 |