Articles | Volume 22, issue 21
https://doi.org/10.5194/bg-22-6765-2025
© 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/bg-22-6765-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
13 Nov 2025
Research article |
| 13 Nov 2025
| 13 Nov 2025
A δ11B-pH calibration for the high-latitude foraminifera species Neogloboquadrina pachyderma and Neogloboquadrina incompta
School of Geography, Archaeology, and Irish Studies, University of Galway, H91TK33 Galway, Ireland
Markus Raitzsch
Dettmer Group GmbH & Co. KG., 28195 Bremen, Germany
Gavin L. Foster
School of Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton, SO14 3ZH, UK
Jelle Bijma
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, 27570, Bremerhaven, Germany
Ulysses S. Ninnemann
Department of Earth Science and Bjerknes Centre for Climate Research, University of Bergen, 5007, Bergen, Norway
Michal Kucera
MARUM – Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
Tali Lea Babila
Case Western Reserve University, Department of Earth, Environmental and Planetary Sciences, Cleveland, Ohio, USA
Jessica Crumpton Banks
School of Geography, Archaeology, and Irish Studies, University of Galway, H91TK33 Galway, Ireland
Mohamed M. Ezat
iC3: Centre for ice, Cryosphere, Carbon and Climate, Department of Geosciences, UiT, The Arctic University of Norway, 9037 Tromsø, Norway
Audrey Morley
CORRESPONDING AUTHOR
School of Geography, Archaeology, and Irish Studies, University of Galway, H91TK33 Galway, Ireland
iCRAG – Irish Centre for Research in Applied Geosciences, Belfield, Dublin 4, Ireland
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Short summary
The boron isotopic composition (δ11B) of foraminifera shells is an established proxy for the reconstruction of ocean pH. Applications to the Arctic oceans are however limited as robust calibrations in these regions are lacking. Here, we present a new calibration linking δ11B measured in two high-latitude foraminifera species to seawater pH. We show that the δ11B of the species analysed is well correlated with seawater pH and that this calibration can be applied to the paleorecord.
The boron isotopic composition (δ11B) of foraminifera shells is an established proxy for the...
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