Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and pCO2 gradients

Guillermic, Maxence; Misra, Sambuddha; Eagle, Robert; Villa, Alexandra; Chang, Fengming; Tripati, Aradhna

doi:10.5194/bg-17-3487-2020

Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and <i>p</i>CO<sub>2</sub> gradients

Journal Article · Wed Jul 08 00:00:00 EDT 2020 · Biogeosciences (Online)

DOI:https://doi.org/10.5194/bg-17-3487-2020· OSTI ID:1802074

Guillermic, Maxence ^[1]; Misra, Sambuddha ^[2]; Eagle, Robert ^[3]; Villa, Alexandra ^[4]; ^[5]; Tripati, Aradhna ^[3]

Univ. of California, Los Angeles, CA (United States). Inst. of the Environment an Sustainability. Dept. of Atmospheric and Oceanic Sciences. Dept. of Earth, Planetary, and Space Sciences; Institut Universitaire Européen de la Mer, Plouzané (France). Laboratoire Géosciences Océan; OSTI
Indian Inst. of Science, Bengaluru (India). Centre for Earth Science; Univ. of Cambridge (United Kingdom). Dept. of Earth Sciences. The Godwin Lab. for Palaeoclimate Research
Univ. of California, Los Angeles, CA (United States). Inst. of the Environment an Sustainability. Dept. of Atmospheric and Oceanic Sciences. Dept. of Earth, Planetary, and Space Sciences; Institut Universitaire Européen de la Mer, Plouzané (France). Laboratoire Géosciences Océan
Univ. of California, Los Angeles, CA (United States). Inst. of the Environment an Sustainability. Dept. of Atmospheric and Oceanic Sciences. Dept. of Earth, Planetary, and Space Sciences; Univ. of Wisconsin, Madison, WI (United States). Dept. of Geoscience
Chinese Academy of Sciences (CAS), Qingdao (China). Inst. of Oceanology. Key Lab. of Marine Geology and Environment

Boron isotope systematics of planktonic foraminifera from core-top sediments and culture experiments have been studied to investigate the sensitivity ofδ11B of calcite tests to seawater pH. However, our knowledge of the relationship between δ11B and pH remains incomplete for many taxa. Thus, to expand the potential scope of application of this proxy, we report δ11B data for seven different species of planktonic foraminifera from sediment core tops. We utilize a method for the measurement 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 have diverse ecological preferences and are from sites that span a range of oceanographic regimes, including some that are in regions of air–sea equilibrium and others that are out of equilibrium with the atmosphere. The sensitivity of δ11Bcarbonate to δ11Bborate (e.g., Δδ11Bcarbonate/Δδ11Bborate) in core tops is consistent with previous studies for T. sacculifer and G. ruber and close to unity for N. dutertrei, O. universa, and combined deep-dwelling species. Deep-dwelling species closely follow the core-top calibration fo rO. universa, which is attributed to respiration-driven microenvironments likely caused by light limitation and/or symbiont–host interactions. Our data support the premise that utilizing boron isotope measurements of multiple species within a sediment core can be utilized to constrain vertical profiles of pH andpCO2 at sites spanning different oceanic regimes, thereby constraining changes in vertical pH gradients and yielding insights into the past behavior of the oceanic carbon pumps.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010288

OSTI ID:: 1802074

Journal Information:: Biogeosciences (Online), Journal Name: Biogeosciences (Online) Journal Issue: 13 Vol. 17; ISSN 1726-4189

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
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Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and <i>p</i>CO<sub>2</sub> gradients

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