Climate of the Past
Climate of the Past
CP
Articles | Volume 17, issue 4
Articles | Volume 17, issue 4
https://doi.org/10.5194/cp-17-1507-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-17-1507-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 17, issue 4
Research article
 | 
19 Jul 2021
Research article |  | 19 Jul 2021

The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean

Jun Shao, Lowell D. Stott, Laurie Menviel, Andy Ridgwell, Malin Ödalen, and Mayhar Mohtadi

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Latest update: 13 Dec 2024
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Short summary
Planktic and shallow benthic foraminiferal stable carbon isotope (δ13C) data show a rapid decline during the last deglaciation. This widespread signal was linked to respired carbon released from the deep ocean and its transport through the upper-ocean circulation. Using numerical simulations in which a stronger flux of respired carbon upwells and outcrops in the Southern Ocean, we find that the depleted δ13C signal is transmitted to the rest of the upper ocean through air–sea gas exchange.
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