Exploring foraminiferal Sr/Ca as a new carbonate system proxy

Nina Keul; Gerald Langer; Silke Thoms; Lennart Jan de Nooijer; Gert-Jan Reichart; Jelle Bijma

doi:10.1016/j.gca.2016.11.022

Exploring foraminiferal Sr/Ca as a new carbonate system proxy

Nina Keul^*, Gerald Langer, Silke Thoms, Lennart Jan de Nooijer, Gert-Jan Reichart, Jelle Bijma

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

In present day paleoclimate research one of the most pressing challenges is the reconstruction of atmospheric CO₂ concentrations. A variety of proxies for several components of the marine inorganic carbon system have been developed in this context (e.g. B isotopes, B/Ca, U/Ca) to allow reconstruction of past seawater pH, HCO₃ ⁻ and CO₃ ²⁻ and thereby facilitate estimates of past atmospheric pCO₂. Based on culture experiments using the benthic foraminifera Ammonia sp. we describe a positive correlation between Sr/Ca and the carbonate system, namely DIC/bicarbonate ion concentration. Foraminiferal Sr/Ca ratios provide potentially additional constraints on the carbonate system proxy, because the analysis of foraminiferal carbonate Sr/Ca is straightforward and not easily contaminated. Applying our calibration to a published dataset of paleo-Sr/Ca suggests the validity of Sr/Ca as a carbonate system proxy. Furthermore, we explore how our data can be used to advance conceptual understanding of the foraminiferal biomineralization mechanism.

Original language	English
Pages (from-to)	374-386
Number of pages	13
Journal	Geochimica et Cosmochimica Acta
Volume	202
DOIs	https://doi.org/10.1016/j.gca.2016.11.022
Publication status	Published - 1 Apr 2017

Keywords

Ammonia
C-system
Calibration
DIC
Foraminifera
Proxies
Sr/Ca
Strontium

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10.1016/j.gca.2016.11.022

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title = "Exploring foraminiferal Sr/Ca as a new carbonate system proxy",

abstract = "In present day paleoclimate research one of the most pressing challenges is the reconstruction of atmospheric CO2 concentrations. A variety of proxies for several components of the marine inorganic carbon system have been developed in this context (e.g. B isotopes, B/Ca, U/Ca) to allow reconstruction of past seawater pH, HCO3 − and CO3 2− and thereby facilitate estimates of past atmospheric pCO2. Based on culture experiments using the benthic foraminifera Ammonia sp. we describe a positive correlation between Sr/Ca and the carbonate system, namely DIC/bicarbonate ion concentration. Foraminiferal Sr/Ca ratios provide potentially additional constraints on the carbonate system proxy, because the analysis of foraminiferal carbonate Sr/Ca is straightforward and not easily contaminated. Applying our calibration to a published dataset of paleo-Sr/Ca suggests the validity of Sr/Ca as a carbonate system proxy. Furthermore, we explore how our data can be used to advance conceptual understanding of the foraminiferal biomineralization mechanism.",

keywords = "Ammonia, C-system, Calibration, DIC, Foraminifera, Proxies, Sr/Ca, Strontium",

author = "Nina Keul and Gerald Langer and Silke Thoms and {de Nooijer}, {Lennart Jan} and Gert-Jan Reichart and Jelle Bijma",

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doi = "10.1016/j.gca.2016.11.022",

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T1 - Exploring foraminiferal Sr/Ca as a new carbonate system proxy

AU - Keul, Nina

AU - Langer, Gerald

AU - Thoms, Silke

AU - de Nooijer, Lennart Jan

AU - Reichart, Gert-Jan

AU - Bijma, Jelle

PY - 2017/4/1

Y1 - 2017/4/1

N2 - In present day paleoclimate research one of the most pressing challenges is the reconstruction of atmospheric CO2 concentrations. A variety of proxies for several components of the marine inorganic carbon system have been developed in this context (e.g. B isotopes, B/Ca, U/Ca) to allow reconstruction of past seawater pH, HCO3 − and CO3 2− and thereby facilitate estimates of past atmospheric pCO2. Based on culture experiments using the benthic foraminifera Ammonia sp. we describe a positive correlation between Sr/Ca and the carbonate system, namely DIC/bicarbonate ion concentration. Foraminiferal Sr/Ca ratios provide potentially additional constraints on the carbonate system proxy, because the analysis of foraminiferal carbonate Sr/Ca is straightforward and not easily contaminated. Applying our calibration to a published dataset of paleo-Sr/Ca suggests the validity of Sr/Ca as a carbonate system proxy. Furthermore, we explore how our data can be used to advance conceptual understanding of the foraminiferal biomineralization mechanism.

AB - In present day paleoclimate research one of the most pressing challenges is the reconstruction of atmospheric CO2 concentrations. A variety of proxies for several components of the marine inorganic carbon system have been developed in this context (e.g. B isotopes, B/Ca, U/Ca) to allow reconstruction of past seawater pH, HCO3 − and CO3 2− and thereby facilitate estimates of past atmospheric pCO2. Based on culture experiments using the benthic foraminifera Ammonia sp. we describe a positive correlation between Sr/Ca and the carbonate system, namely DIC/bicarbonate ion concentration. Foraminiferal Sr/Ca ratios provide potentially additional constraints on the carbonate system proxy, because the analysis of foraminiferal carbonate Sr/Ca is straightforward and not easily contaminated. Applying our calibration to a published dataset of paleo-Sr/Ca suggests the validity of Sr/Ca as a carbonate system proxy. Furthermore, we explore how our data can be used to advance conceptual understanding of the foraminiferal biomineralization mechanism.

KW - Ammonia

KW - C-system

KW - Calibration

KW - DIC

KW - Foraminifera

KW - Proxies

KW - Sr/Ca

KW - Strontium

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U2 - 10.1016/j.gca.2016.11.022

DO - 10.1016/j.gca.2016.11.022

M3 - Article

AN - SCOPUS:85013635029

SN - 0016-7037

VL - 202

SP - 374

EP - 386

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

ER -

Exploring foraminiferal Sr/Ca as a new carbonate system proxy

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Keywords

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