Articles | Volume 19, issue 3
https://doi.org/10.5194/cp-19-555-2023
© Author(s) 2023. 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-19-555-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Mar 2023
Research article |
| 14 Mar 2023
| 14 Mar 2023
A 600 kyr reconstruction of deep Arctic seawater δ18O from benthic foraminiferal δ18O and ostracode Mg ∕ Ca paleothermometry
School for the Environment, University of Massachusetts Boston,
Boston, MA, USA
Max Planck Institute for Chemistry, Mainz, Germany
Department of Geosciences, Princeton University, Princeton, NJ, USA
Katherine J. Keller
Department of Earth and Planetary Sciences, Harvard University,
Cambridge, MA, USA
US Geological Survey, Florence Bascom Geoscience Center, Reston, VA, USA
Robert K. Poirier
US Geological Survey, Florence Bascom Geoscience Center, Reston, VA, USA
Gary S. Dwyer
Division of Earth and Climate Sciences, Nicholas School of
Environment, Duke University, Durham, NC, USA
Morgan F. Schaller
Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, USA
Helen K. Coxall
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Matt O'Regan
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Thomas M. Cronin
US Geological Survey, Florence Bascom Geoscience Center, Reston, VA, USA
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Short summary
Oxygen isotopes are used to date marine sediments via similar large-scale ocean patterns over glacial cycles. However, the Arctic Ocean exhibits a different isotope pattern, creating uncertainty in the timing of past Arctic climate change. We find that the Arctic Ocean experienced large local oxygen isotope changes over glacial cycles. We attribute this to a breakdown of stratification during ice ages that allowed for a unique low isotope value to characterize the ice age Arctic Ocean.
Oxygen isotopes are used to date marine sediments via similar large-scale ocean patterns over...
