Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera
International audience The Mg/Ca ratio of planktic foraminifera is a widely used proxy for sea-surface temperature but is also sensitive to other environmental factors. Previous work has relied on correcting Mg/Ca for nonthermal influences. Here, we develop a set of Bayesian models for Mg/Ca in four...
Published in: | Paleoceanography and Paleoclimatology |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.science/hal-02973694 https://hal.science/hal-02973694/document https://hal.science/hal-02973694/file/Tierney_et_al-2019.pdf https://doi.org/10.1029/2019PA003744 |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Tierney, Jessica E. Malevich, Steven B. Gray, William Vetter, Lael Thirumalai, Kaustubh, J Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience The Mg/Ca ratio of planktic foraminifera is a widely used proxy for sea-surface temperature but is also sensitive to other environmental factors. Previous work has relied on correcting Mg/Ca for nonthermal influences. Here, we develop a set of Bayesian models for Mg/Ca in four major planktic groups-Globigerinoides ruber (including both pink and white chromotypes), Trilobatus sacculifer, Globigerina bulloides, and Neogloboquadrina pachyderma (including N. incompta)-that account for the multivariate influences on this proxy in an integrated framework. We use a hierarchical model design that leverages information from both laboratory culture studies and globally distributed core top data, allowing us to include environmental sensitivities that are poorly constrained by core top observations alone. For applications over longer geological timescales, we develop a version of the model that incorporates changes in the Mg/Ca ratio of seawater. We test our models-collectively referred to as BAYMAG-on sediment trap data and on representative paleoclimate time series and demonstrate good agreement with observations and independent sea-surface temperature proxies. BAYMAG provides probabilistic estimates of past temperatures that can accommodate uncertainties in other environmental influences, enhancing our ability to interpret signals encoded in Mg/Ca. Plain Language Summary The amount of magnesium (Mg) incorporated into the calcite shells of tiny protists called foraminifera is determined by the temperature of the water in which they grew. This allows paleoclimatologists to measure the magnesium-to-calcium (Mg/Ca) ratio of fossil foraminiferal shells and determine how past sea-surface temperatures have changed. However, other factors can influence Mg/Ca, like the salinity and pH of seawater. Here, we develop Bayesian models of foraminiferal Mg/Ca that account for all of the influences on Mg/Ca and show how we can use these to improve our interpretations of Mg/Ca data. |
author2 |
Department of Geosciences University of Arizona University of Arizona Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) |
format |
Article in Journal/Newspaper |
author |
Tierney, Jessica E. Malevich, Steven B. Gray, William Vetter, Lael Thirumalai, Kaustubh, J |
author_facet |
Tierney, Jessica E. Malevich, Steven B. Gray, William Vetter, Lael Thirumalai, Kaustubh, J |
author_sort |
Tierney, Jessica E. |
title |
Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera |
title_short |
Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera |
title_full |
Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera |
title_fullStr |
Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera |
title_full_unstemmed |
Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera |
title_sort |
bayesian calibration of the mg/ca paleothermometer in planktic foraminifera |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02973694 https://hal.science/hal-02973694/document https://hal.science/hal-02973694/file/Tierney_et_al-2019.pdf https://doi.org/10.1029/2019PA003744 |
genre |
Neogloboquadrina pachyderma |
genre_facet |
Neogloboquadrina pachyderma |
op_source |
ISSN: 2572-4525 EISSN: 1944-9186 Paleoceanography and Paleoclimatology https://hal.science/hal-02973694 Paleoceanography and Paleoclimatology, 2019, 34 (12), pp.2005-2030. ⟨10.1029/2019PA003744⟩ |
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op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019PA003744 |
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Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
12 |
container_start_page |
2005 |
op_container_end_page |
2030 |
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1797587068760621056 |
spelling |
ftinsu:oai:HAL:hal-02973694v1 2024-04-28T08:28:35+00:00 Bayesian Calibration of the Mg/Ca Paleothermometer in Planktic Foraminifera Tierney, Jessica E. Malevich, Steven B. Gray, William Vetter, Lael Thirumalai, Kaustubh, J Department of Geosciences University of Arizona University of Arizona Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) 2019-12 https://hal.science/hal-02973694 https://hal.science/hal-02973694/document https://hal.science/hal-02973694/file/Tierney_et_al-2019.pdf https://doi.org/10.1029/2019PA003744 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2019PA003744 hal-02973694 https://hal.science/hal-02973694 https://hal.science/hal-02973694/document https://hal.science/hal-02973694/file/Tierney_et_al-2019.pdf doi:10.1029/2019PA003744 info:eu-repo/semantics/OpenAccess ISSN: 2572-4525 EISSN: 1944-9186 Paleoceanography and Paleoclimatology https://hal.science/hal-02973694 Paleoceanography and Paleoclimatology, 2019, 34 (12), pp.2005-2030. ⟨10.1029/2019PA003744⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1029/2019PA003744 2024-04-05T00:40:08Z International audience The Mg/Ca ratio of planktic foraminifera is a widely used proxy for sea-surface temperature but is also sensitive to other environmental factors. Previous work has relied on correcting Mg/Ca for nonthermal influences. Here, we develop a set of Bayesian models for Mg/Ca in four major planktic groups-Globigerinoides ruber (including both pink and white chromotypes), Trilobatus sacculifer, Globigerina bulloides, and Neogloboquadrina pachyderma (including N. incompta)-that account for the multivariate influences on this proxy in an integrated framework. We use a hierarchical model design that leverages information from both laboratory culture studies and globally distributed core top data, allowing us to include environmental sensitivities that are poorly constrained by core top observations alone. For applications over longer geological timescales, we develop a version of the model that incorporates changes in the Mg/Ca ratio of seawater. We test our models-collectively referred to as BAYMAG-on sediment trap data and on representative paleoclimate time series and demonstrate good agreement with observations and independent sea-surface temperature proxies. BAYMAG provides probabilistic estimates of past temperatures that can accommodate uncertainties in other environmental influences, enhancing our ability to interpret signals encoded in Mg/Ca. Plain Language Summary The amount of magnesium (Mg) incorporated into the calcite shells of tiny protists called foraminifera is determined by the temperature of the water in which they grew. This allows paleoclimatologists to measure the magnesium-to-calcium (Mg/Ca) ratio of fossil foraminiferal shells and determine how past sea-surface temperatures have changed. However, other factors can influence Mg/Ca, like the salinity and pH of seawater. Here, we develop Bayesian models of foraminiferal Mg/Ca that account for all of the influences on Mg/Ca and show how we can use these to improve our interpretations of Mg/Ca data. Article in Journal/Newspaper Neogloboquadrina pachyderma Institut national des sciences de l'Univers: HAL-INSU Paleoceanography and Paleoclimatology 34 12 2005 2030 |