Evaluating isoprenoidal hydroxylated GDGT-based temperature proxies in surface sediments from the global ocean

Devika Varma; Ellen C. Hopmans; Zoë R. van Kemenade; Stephanie Kusch; Sonja Berg; Nicole J. Bale; Francesca Sangiorgi; Gert Jan Reichart; Jaap S. Sinninghe Damsté; Stefan Schouten

doi:10.1016/j.gca.2023.12.019

Evaluating isoprenoidal hydroxylated GDGT-based temperature proxies in surface sediments from the global ocean

Devika Varma^*, Ellen C. Hopmans, Zoë R. van Kemenade, Stephanie Kusch, Sonja Berg, Nicole J. Bale, Francesca Sangiorgi, Gert Jan Reichart, Jaap S. Sinninghe Damsté, Stefan Schouten

^*Corresponding author for this work

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

Abstract

Recently developed temperature proxies based on hydroxylated isoprenoid Glycerol Dialkyl Glycerol Tetraethers (OH-isoGDGTs), such as %OH, RI-OH, RI-OH′ and OH^C, have shown potential for reconstructing past temperature changes. However, progress has been limited by the lack of a global core-top calibration with ample geographical coverage. Here, we compile an extensive global surface sediment dataset of OH-isoGDGTs as well as regular isoprenoid GDGTs (isoGDGTs), with both data generated at NIOZ (n = 575) and previously published data from other laboratories (n = 297). We find interlaboratory differences for proxy indices that incorporate both OH-isoGDGTs and regular isoGDGTs, indicating that care must be taken in compiling large GDGT datasets from multiple laboratories. Our results confirm a strong temperature signal in the isoGDGT distribution, especially for OH-isoGDGT-0 and non-hydroxylated isoGDGTs, but also reveal that water depth might have an impact on the distribution of OH-isoGDGTs with 1 and 2 cyclopentane moieties. This will affect the RI-OH and RI-OH′ indices, particularly in tropical regions, where OH-isoGDGT-0 occurs at low abundance. We explore new proxy indices that combine the temperature dependence of both isoGDGT and OH-isoGDGT distributions and propose the use of TEX₈₆^OH, which includes OH-isoGDGT-0 in the denominator of the TEX₈₆ index. This modification leads to a much higher temperature sensitivity of the index, especially in regions with annual mean sea surface temperatures between 5 and 15 °C. Application of this novel paleothermometer to a polar sediment core suggests that this proxy is likely to result in more reliable temperature reconstructions in polar regions where OH-isoGDGTs are abundant.

Original language	English
Pages (from-to)	113-127
Number of pages	15
Journal	Geochimica et Cosmochimica Acta
Volume	370
DOIs	https://doi.org/10.1016/j.gca.2023.12.019
Publication status	Published - 1 Apr 2024

Bibliographical note

Publisher Copyright:
© 2023 The Authors

Funding

We thank Anchelique Mets, Monique Verweij and Denise Dorhout for analytical support. We are grateful to the individuals who supplied or extracted the surface sediments for previous studies and utilized in this study: Marijke de Bar, Julie Lattaud, Hartmut Schulz, Cindy De Jonge, Matthias Moros, Julian Hartman, Furu Mienis, Geert-Jan A. Brummer, Claudia Zell, Lisa Warden, Gabriella Weiss, Veronica Willmott, Jan-Berend W. Stuut, Barbara Donner, Jochen Knies and Andreas Lückge. This research used sediments provided by the International Ocean Discovery Program (IODP). This work was carried out under the program of the Netherlands Earth System Science Centre (NESSC), financially supported by the Ministry of Education, Culture and Science (OCW) through grant 024.002.001 to JSSD and SS. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie, grant agreement No 847504. We thank Anchelique Mets, Monique Verweij and Denise Dorhout for analytical support. We are grateful to the individuals who supplied or extracted the surface sediments for previous studies and utilized in this study: Marijke de Bar, Julie Lattaud, Hartmut Schulz, Cindy De Jonge, Matthias Moros, Julian Hartman, Furu Mienis, Geert-Jan A. Brummer, Claudia Zell, Lisa Warden, Gabriella Weiss, Veronica Willmott, Jan-Berend W. Stuut, Barbara Donner, Jochen Knies and Andreas Lückge. This research used sediments provided by the International Ocean Discovery Program (IODP). This work was carried out under the program of the Netherlands Earth System Science Centre (NESSC), financially supported by the Ministry of Education, Culture and Science (OCW) through grant 024.002.001 to JSSD and SS. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie, grant agreement No 847504.

Funders	Funder number
International Ocean Discovery Program
Horizon 2020 Framework Programme
H2020 Marie Skłodowska-Curie Actions	847504
Ministerie van onderwijs, cultuur en wetenschap	024.002.001
Horizon 2020
Netherlands Earth System Science Centre

Keywords

%OH
Hydroxylated GDGTs
RI–OH
Surface sediments
TEX

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Cite this

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title = "Evaluating isoprenoidal hydroxylated GDGT-based temperature proxies in surface sediments from the global ocean",

abstract = "Recently developed temperature proxies based on hydroxylated isoprenoid Glycerol Dialkyl Glycerol Tetraethers (OH-isoGDGTs), such as %OH, RI-OH, RI-OH′ and OHC, have shown potential for reconstructing past temperature changes. However, progress has been limited by the lack of a global core-top calibration with ample geographical coverage. Here, we compile an extensive global surface sediment dataset of OH-isoGDGTs as well as regular isoprenoid GDGTs (isoGDGTs), with both data generated at NIOZ (n = 575) and previously published data from other laboratories (n = 297). We find interlaboratory differences for proxy indices that incorporate both OH-isoGDGTs and regular isoGDGTs, indicating that care must be taken in compiling large GDGT datasets from multiple laboratories. Our results confirm a strong temperature signal in the isoGDGT distribution, especially for OH-isoGDGT-0 and non-hydroxylated isoGDGTs, but also reveal that water depth might have an impact on the distribution of OH-isoGDGTs with 1 and 2 cyclopentane moieties. This will affect the RI-OH and RI-OH′ indices, particularly in tropical regions, where OH-isoGDGT-0 occurs at low abundance. We explore new proxy indices that combine the temperature dependence of both isoGDGT and OH-isoGDGT distributions and propose the use of TEX86OH, which includes OH-isoGDGT-0 in the denominator of the TEX86 index. This modification leads to a much higher temperature sensitivity of the index, especially in regions with annual mean sea surface temperatures between 5 and 15 °C. Application of this novel paleothermometer to a polar sediment core suggests that this proxy is likely to result in more reliable temperature reconstructions in polar regions where OH-isoGDGTs are abundant.",

keywords = "%OH, Hydroxylated GDGTs, RI–OH, Surface sediments, TEX",

author = "Devika Varma and Hopmans, {Ellen C.} and {van Kemenade}, {Zo{\"e} R.} and Stephanie Kusch and Sonja Berg and Bale, {Nicole J.} and Francesca Sangiorgi and Reichart, {Gert Jan} and {Sinninghe Damst{\'e}}, {Jaap S.} and Stefan Schouten",

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doi = "10.1016/j.gca.2023.12.019",

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T1 - Evaluating isoprenoidal hydroxylated GDGT-based temperature proxies in surface sediments from the global ocean

AU - Varma, Devika

AU - Hopmans, Ellen C.

AU - van Kemenade, Zoë R.

AU - Kusch, Stephanie

AU - Berg, Sonja

AU - Bale, Nicole J.

AU - Sangiorgi, Francesca

AU - Reichart, Gert Jan

AU - Sinninghe Damsté, Jaap S.

AU - Schouten, Stefan

PY - 2024/4/1

Y1 - 2024/4/1

N2 - Recently developed temperature proxies based on hydroxylated isoprenoid Glycerol Dialkyl Glycerol Tetraethers (OH-isoGDGTs), such as %OH, RI-OH, RI-OH′ and OHC, have shown potential for reconstructing past temperature changes. However, progress has been limited by the lack of a global core-top calibration with ample geographical coverage. Here, we compile an extensive global surface sediment dataset of OH-isoGDGTs as well as regular isoprenoid GDGTs (isoGDGTs), with both data generated at NIOZ (n = 575) and previously published data from other laboratories (n = 297). We find interlaboratory differences for proxy indices that incorporate both OH-isoGDGTs and regular isoGDGTs, indicating that care must be taken in compiling large GDGT datasets from multiple laboratories. Our results confirm a strong temperature signal in the isoGDGT distribution, especially for OH-isoGDGT-0 and non-hydroxylated isoGDGTs, but also reveal that water depth might have an impact on the distribution of OH-isoGDGTs with 1 and 2 cyclopentane moieties. This will affect the RI-OH and RI-OH′ indices, particularly in tropical regions, where OH-isoGDGT-0 occurs at low abundance. We explore new proxy indices that combine the temperature dependence of both isoGDGT and OH-isoGDGT distributions and propose the use of TEX86OH, which includes OH-isoGDGT-0 in the denominator of the TEX86 index. This modification leads to a much higher temperature sensitivity of the index, especially in regions with annual mean sea surface temperatures between 5 and 15 °C. Application of this novel paleothermometer to a polar sediment core suggests that this proxy is likely to result in more reliable temperature reconstructions in polar regions where OH-isoGDGTs are abundant.

AB - Recently developed temperature proxies based on hydroxylated isoprenoid Glycerol Dialkyl Glycerol Tetraethers (OH-isoGDGTs), such as %OH, RI-OH, RI-OH′ and OHC, have shown potential for reconstructing past temperature changes. However, progress has been limited by the lack of a global core-top calibration with ample geographical coverage. Here, we compile an extensive global surface sediment dataset of OH-isoGDGTs as well as regular isoprenoid GDGTs (isoGDGTs), with both data generated at NIOZ (n = 575) and previously published data from other laboratories (n = 297). We find interlaboratory differences for proxy indices that incorporate both OH-isoGDGTs and regular isoGDGTs, indicating that care must be taken in compiling large GDGT datasets from multiple laboratories. Our results confirm a strong temperature signal in the isoGDGT distribution, especially for OH-isoGDGT-0 and non-hydroxylated isoGDGTs, but also reveal that water depth might have an impact on the distribution of OH-isoGDGTs with 1 and 2 cyclopentane moieties. This will affect the RI-OH and RI-OH′ indices, particularly in tropical regions, where OH-isoGDGT-0 occurs at low abundance. We explore new proxy indices that combine the temperature dependence of both isoGDGT and OH-isoGDGT distributions and propose the use of TEX86OH, which includes OH-isoGDGT-0 in the denominator of the TEX86 index. This modification leads to a much higher temperature sensitivity of the index, especially in regions with annual mean sea surface temperatures between 5 and 15 °C. Application of this novel paleothermometer to a polar sediment core suggests that this proxy is likely to result in more reliable temperature reconstructions in polar regions where OH-isoGDGTs are abundant.

KW - %OH

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KW - RI–OH

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JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

ER -

Evaluating isoprenoidal hydroxylated GDGT-based temperature proxies in surface sediments from the global ocean

Abstract

Bibliographical note

Funding

Keywords

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