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. Boron isotope systematics of planktonic foraminifera from core-top sedimentsand culture experiments have been studied to investigate the sensitivity ofδ11B of calcite tests to seawater pH. However, our knowledge ofthe relationship between δ11B and pH remains incomplete formany taxa. Thus, to expand the potential scope of application of this proxy,we report δ11B data for seven different species of planktonicforaminifera from sediment core tops. We utilize a method for themeasurement of small samples of foraminifera and calculate the δ11B-calcite sensitivity to pH for Globigerinoides ruber, Trilobus sacculifer (sacc or without sacc), Orbulina universa,Pulleniatina obliquiloculata, Neogloboquadrina dutertrei, Globorotalia menardii, and Globorotalia tumida, including for unstudied core tops and species. These taxa havediverse ecological preferences and are from sites that span a range ofoceanographic regimes, including some that are in regions of air–seaequilibrium and others that are out of equilibrium with the atmosphere. Thesensitivity of δ11Bcarbonate to δ11Bborate (e.g., Δδ11Bcarbonate∕Δδ11Bborate) in core tops is consistent with previousstudies for T. sacculifer and G. ruber and close to unity for N. dutertrei, O. universa, and combined deep-dwellingspecies. Deep-dwelling species closely follow the core-top calibration forO. universa, which is attributed to respiration-driven microenvironments likely causedby light limitation and/or symbiont–host interactions. Our data support thepremise that utilizing boron isotope measurements of multiple species withina sediment core can be utilized to constrain vertical profiles of pH andpCO2 at sites spanning different oceanic regimes, thereby constrainingchanges in vertical pH gradients and yielding insights into the pastbehavior of the oceanic carbon pumps.

biogeosciences

Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and &amp;lt;i&amp;gt;p&amp;lt;/i&amp;gt;CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; gradients