Temperature Calibration of Elevated Mg/Ca in Planktic Foraminifera Shells From the Hypersaline Gulf of Aqaba

N. Levy; A. Torfstein; R. Schiebel; N. Chernihovsky; K. P. Jochum; U. Weis; B. Stoll; G. H. Haug

doi:10.1029/2022GC010742

Temperature Calibration of Elevated Mg/Ca in Planktic Foraminifera Shells From the Hypersaline Gulf of Aqaba

N. Levy^*, A. Torfstein, R. Schiebel, N. Chernihovsky, K. P. Jochum, U. Weis, B. Stoll, G. H. Haug

^*Corresponding author for this work

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

Abstract

The Mg/Ca of marine calcareous Planktic Foraminifera (PF) shells is commonly used for sea surface temperature reconstructions. However, compared to open marine environments, hypersaline (>40) oligotrophic seas have been shown to accommodate PF with higher Mg/Ca and divergent temperature to Mg/Ca relationships. To investigate influencing factors of PF Mg uptake in hypersaline regions, we measured the Mg/Ca of two flux-dominating PF species, Globigerinoides ruber albus and Turborotalita clarkei, derived from a monthly resolved time series of sediment traps in the Gulf of Aqaba, northern Red Sea as well as the corresponding temperature, salinity, and pH values. The PF exhibit elevated Mg/Ca which cannot be explained by post-deposition or interstitial sediment diagenetic processes. G. ruber albus displays Mg/Ca trends that strongly follow seasonal mixed layer temperature changes. Conversely, T. clarkei Mg/Ca trends do not follow temperature but rather show significant Mg/Ca enrichment following mixing of the surface water column. We present a framework for incorporating elevated Mg/Ca into global Mg/Ca-T calibrations for G. ruber albus and present a new Mg/Ca-T calibration suitable for hypersaline marine environments.

Original language	American English
Article number	e2022GC010742
Journal	Geochemistry, Geophysics, Geosystems
Volume	24
Issue number	7
DOIs	https://doi.org/10.1029/2022GC010742
State	Published - Jul 2023

Bibliographical note

Funding Information:
We wish to acknowledge B. Yarden and the IUI marine crew for their assistance in field work and sample handling. The National Monitoring Program is thanked for their support and sharing results and E. Levy for comments and suggestions. We are thankful for reviews by Yair Rosenthal, Lennart de Nooijer and another anonymous reviewer, which significantly improved this manuscript. This work was supported by Israel Science Foundation Grant 834/19 (to AT), a Minerva PhD Fellowship stipend (to NL) and a scholarship from the Advance School for Environmental Studies, HUJI (to NL). Open Access funding enabled and organized by Projekt DEAL.

Publisher Copyright:
© 2023 The Authors. Geochemistry, Geophysics, Geosystems published by Wiley Periodicals LLC on behalf of American Geophysical Union.

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10.1029/2022GC010742

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title = "Temperature Calibration of Elevated Mg/Ca in Planktic Foraminifera Shells From the Hypersaline Gulf of Aqaba",

abstract = "The Mg/Ca of marine calcareous Planktic Foraminifera (PF) shells is commonly used for sea surface temperature reconstructions. However, compared to open marine environments, hypersaline (>40) oligotrophic seas have been shown to accommodate PF with higher Mg/Ca and divergent temperature to Mg/Ca relationships. To investigate influencing factors of PF Mg uptake in hypersaline regions, we measured the Mg/Ca of two flux-dominating PF species, Globigerinoides ruber albus and Turborotalita clarkei, derived from a monthly resolved time series of sediment traps in the Gulf of Aqaba, northern Red Sea as well as the corresponding temperature, salinity, and pH values. The PF exhibit elevated Mg/Ca which cannot be explained by post-deposition or interstitial sediment diagenetic processes. G. ruber albus displays Mg/Ca trends that strongly follow seasonal mixed layer temperature changes. Conversely, T. clarkei Mg/Ca trends do not follow temperature but rather show significant Mg/Ca enrichment following mixing of the surface water column. We present a framework for incorporating elevated Mg/Ca into global Mg/Ca-T calibrations for G. ruber albus and present a new Mg/Ca-T calibration suitable for hypersaline marine environments.",

author = "N. Levy and A. Torfstein and R. Schiebel and N. Chernihovsky and Jochum, {K. P.} and U. Weis and B. Stoll and Haug, {G. H.}",

note = "Funding Information: We wish to acknowledge B. Yarden and the IUI marine crew for their assistance in field work and sample handling. The National Monitoring Program is thanked for their support and sharing results and E. Levy for comments and suggestions. We are thankful for reviews by Yair Rosenthal, Lennart de Nooijer and another anonymous reviewer, which significantly improved this manuscript. This work was supported by Israel Science Foundation Grant 834/19 (to AT), a Minerva PhD Fellowship stipend (to NL) and a scholarship from the Advance School for Environmental Studies, HUJI (to NL). Open Access funding enabled and organized by Projekt DEAL. Publisher Copyright: {\textcopyright} 2023 The Authors. Geochemistry, Geophysics, Geosystems published by Wiley Periodicals LLC on behalf of American Geophysical Union.",

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T1 - Temperature Calibration of Elevated Mg/Ca in Planktic Foraminifera Shells From the Hypersaline Gulf of Aqaba

AU - Levy, N.

AU - Torfstein, A.

AU - Schiebel, R.

AU - Chernihovsky, N.

AU - Jochum, K. P.

AU - Weis, U.

AU - Stoll, B.

AU - Haug, G. H.

N1 - Funding Information: We wish to acknowledge B. Yarden and the IUI marine crew for their assistance in field work and sample handling. The National Monitoring Program is thanked for their support and sharing results and E. Levy for comments and suggestions. We are thankful for reviews by Yair Rosenthal, Lennart de Nooijer and another anonymous reviewer, which significantly improved this manuscript. This work was supported by Israel Science Foundation Grant 834/19 (to AT), a Minerva PhD Fellowship stipend (to NL) and a scholarship from the Advance School for Environmental Studies, HUJI (to NL). Open Access funding enabled and organized by Projekt DEAL. Publisher Copyright: © 2023 The Authors. Geochemistry, Geophysics, Geosystems published by Wiley Periodicals LLC on behalf of American Geophysical Union.

PY - 2023/7

Y1 - 2023/7

N2 - The Mg/Ca of marine calcareous Planktic Foraminifera (PF) shells is commonly used for sea surface temperature reconstructions. However, compared to open marine environments, hypersaline (>40) oligotrophic seas have been shown to accommodate PF with higher Mg/Ca and divergent temperature to Mg/Ca relationships. To investigate influencing factors of PF Mg uptake in hypersaline regions, we measured the Mg/Ca of two flux-dominating PF species, Globigerinoides ruber albus and Turborotalita clarkei, derived from a monthly resolved time series of sediment traps in the Gulf of Aqaba, northern Red Sea as well as the corresponding temperature, salinity, and pH values. The PF exhibit elevated Mg/Ca which cannot be explained by post-deposition or interstitial sediment diagenetic processes. G. ruber albus displays Mg/Ca trends that strongly follow seasonal mixed layer temperature changes. Conversely, T. clarkei Mg/Ca trends do not follow temperature but rather show significant Mg/Ca enrichment following mixing of the surface water column. We present a framework for incorporating elevated Mg/Ca into global Mg/Ca-T calibrations for G. ruber albus and present a new Mg/Ca-T calibration suitable for hypersaline marine environments.

AB - The Mg/Ca of marine calcareous Planktic Foraminifera (PF) shells is commonly used for sea surface temperature reconstructions. However, compared to open marine environments, hypersaline (>40) oligotrophic seas have been shown to accommodate PF with higher Mg/Ca and divergent temperature to Mg/Ca relationships. To investigate influencing factors of PF Mg uptake in hypersaline regions, we measured the Mg/Ca of two flux-dominating PF species, Globigerinoides ruber albus and Turborotalita clarkei, derived from a monthly resolved time series of sediment traps in the Gulf of Aqaba, northern Red Sea as well as the corresponding temperature, salinity, and pH values. The PF exhibit elevated Mg/Ca which cannot be explained by post-deposition or interstitial sediment diagenetic processes. G. ruber albus displays Mg/Ca trends that strongly follow seasonal mixed layer temperature changes. Conversely, T. clarkei Mg/Ca trends do not follow temperature but rather show significant Mg/Ca enrichment following mixing of the surface water column. We present a framework for incorporating elevated Mg/Ca into global Mg/Ca-T calibrations for G. ruber albus and present a new Mg/Ca-T calibration suitable for hypersaline marine environments.

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U2 - 10.1029/2022GC010742

DO - 10.1029/2022GC010742

M3 - Article

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VL - 24

JO - Geochemistry, Geophysics, Geosystems

JF - Geochemistry, Geophysics, Geosystems

IS - 7

M1 - e2022GC010742

ER -

Temperature Calibration of Elevated Mg/Ca in Planktic Foraminifera Shells From the Hypersaline Gulf of Aqaba

Abstract

Bibliographical note

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