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.
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.
the Creative Commons Attribution 4.0 License.
Research article
| 
18 Jul 2025
Research article |
| 18 Jul 2025
| 18 Jul 2025
Persistent deep-water formation in the Nordic Seas during Marine Isotope Stages 5 and 4 notwithstanding changes in Atlantic overturning
Institute of Geosciences, Kiel University, Kiel, Germany
Henning A. Bauch
Research Division Ocean Circulation and Climate Dynamics, GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
Marine Geology Department, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
Daniel A. Frick
Institute of Geosciences, Kiel University, Kiel, Germany
Jimin Yu
Department of Ocean Sciences and Interdisciplinary Frontiers, Laoshan Laboratory, Qingdao, China
Julia Gottschalk
Institute of Geosciences, Kiel University, Kiel, Germany
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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.
New bottom water reconstructions in the deep Norwegian Sea show higher [CO32-] values in Marine...
