Articles | Volume 19, issue 12
https://doi.org/10.5194/cp-19-2493-2023
© 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-19-2493-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Dec 2023
Research article |
| 12 Dec 2023
| 12 Dec 2023
Orbital CO2 reconstruction using boron isotopes during the late Pleistocene, an assessment of accuracy
Elwyn de la Vega
CORRESPONDING AUTHOR
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
Ollscoil na Gaillimhe, School of Geography, Archaeology & Irish Studies, University of Galway, University Road, Galway, H91 TK33, Ireland
Thomas B. Chalk
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
Aix Marseille Université, CNRS, IRD, INRAE, CEREGE, Aix-en-Provence, France
Mathis P. Hain
Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA, USA
Megan R. Wilding
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
Daniel Casey
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
Robin Gledhill
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
Chongguang Luo
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, P. R. China
Paul A. Wilson
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
Gavin L. Foster
School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront campus, Southampton SO14 3ZH, UK
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Short summary
We evaluate how faithfully the boron isotope composition of foraminifera records atmospheric CO2 by comparing it to the high-fidelity CO2 record from the Antarctic ice cores. We evaluate potential factors and find that partial dissolution of foraminifera shells, assumptions of seawater chemistry, and the biology of foraminifera all have a negligible effect on reconstructed CO2. This gives confidence in the use of boron isotopes beyond the interval when ice core CO2 is available.
We evaluate how faithfully the boron isotope composition of foraminifera records atmospheric CO2...
