A δ11B-pH calibration for the high-latitude foraminifera species Neogloboquadrina pachyderma and Neogloboquadrina incompta

de la Vega, Elwyn; Raitzsch, Markus; Foster, Gavin L.; Bijma, Jelle; Ninnemann, Ulysses S.; Kucera, Michal; Babila, Tali Lea; Crumpton Banks, Jessica; Ezat, Mohamed M.; Morley, Audrey

doi:10.5194/bg-22-6765-2025

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.

https://doi.org/10.5194/bg-22-6765-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 21

Research article

|

13 Nov 2025

Research article |

| 13 Nov 2025

A δ¹¹B-pH calibration for the high-latitude foraminifera species Neogloboquadrina pachyderma and Neogloboquadrina incompta

Elwyn de la Vega, Markus Raitzsch, Gavin L. Foster, Jelle Bijma, Ulysses S. Ninnemann, Michal Kucera, Tali Lea Babila, Jessica Crumpton Banks, Mohamed M. Ezat, and Audrey Morley

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Cumulative views and downloads (calculated since 10 Jun 2025)

Month	HTML	PDF	XML	Total
Jun 2025	274	90	14	378
Jul 2025	146	44	6	196
Aug 2025	278	38	4	320
Sep 2025	1,078	66	10	1,154
Oct 2025	114	48	4	166
Nov 2025	332	59	17	408
Dec 2025	184	54	49	287
Jan 2026	178	84	31	293
Feb 2026	150	35	7	192
Mar 2026	194	41	19	254
Apr 2026	146	52	12	210
May 2026	95	25	5	125
Jun 2026	26	11	6	43
Jul 2026	42	45	17	104
Aug 2026	57	4	15	76

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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.