Climate of the Past
Climate of the Past
CP
Articles | Volume 21, issue 7
Articles | Volume 21, issue 7
https://doi.org/10.5194/cp-21-1281-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-21-1281-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 7
Research article
 | 
18 Jul 2025
Research article |  | 18 Jul 2025

Persistent deep-water formation in the Nordic Seas during Marine Isotope Stages 5 and 4 notwithstanding changes in Atlantic overturning

Tim B. Stobbe, Henning A. Bauch, Daniel A. Frick, Jimin Yu, and Julia Gottschalk

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Short summary
New bottom water reconstructions in the deep Norwegian Sea show higher [CO32-] values in Marine Isotope Stages 5 and 4 than in the Holocene. This suggests modern-like/persistent deep-water formation in this region, even when Atlantic overturning weakened and/or shoaled. Our data put new constraints on the endmember [CO32-] composition of northern component waters emerging from the Nordic Seas, with implications for the chemical characteristics and carbon storage capacity of the Atlantic Ocean.
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