Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions
The neodymium (Nd) isotopic composition of seawater is a widely used ocean circulation tracer. However, uncertainty in quantifying the global ocean Nd budget, particularly constraining elusive non-conservative processes, remains a major challenge. A substantial increase in modern seawater Nd measure...
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ftcopernicus:oai:publications.copernicus.org:egusphere105015 2023-05-15T17:35:53+02:00 Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions Robinson, Suzanne Ivanovic, Ruza Gregoire, Lauren Tindall, Julia Flierdt, Tina Plancherel, Yves Pöppelmeier, Frerk Tachikawa, Kazuyo Valdes, Paul 2023-02-22 application/pdf https://doi.org/10.5194/egusphere-2022-606 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-606/ eng eng doi:10.5194/egusphere-2022-606 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-606/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2022-606 2023-02-27T17:22:58Z The neodymium (Nd) isotopic composition of seawater is a widely used ocean circulation tracer. However, uncertainty in quantifying the global ocean Nd budget, particularly constraining elusive non-conservative processes, remains a major challenge. A substantial increase in modern seawater Nd measurements from the GEOTRACES programme, coupled with recent hypotheses that a seafloor-wide benthic Nd flux to the ocean may govern global Nd isotope distributions ( ε Nd ), presents an opportunity to develop a new scheme specifically designed to test these paradigms. Here, we present the implementation of Nd isotopes ( 143 Nd and 144 Nd) into the ocean component of the FAMOUS coupled atmosphere–ocean general circulation model (Nd v1.0), a tool which can be widely used for simulating complex feedbacks between different Earth system processes on decadal to multi-millennial timescales. Using an equilibrium pre-industrial simulation tuned to represent the large-scale Atlantic Ocean circulation, we perform a series of sensitivity tests evaluating the new Nd isotope scheme. We investigate how Nd source and sink and cycling parameters govern global marine ε Nd distributions and provide an updated compilation of 6048 Nd concentrations and 3278 ε Nd measurements to assess model performance. Our findings support the notions that reversible scavenging is a key process for enhancing the Atlantic–Pacific basinal ε Nd gradient and is capable of driving the observed increase in Nd concentration along the global circulation pathway. A benthic flux represents a major source of Nd to the deep ocean. However, model–data disparities in the North Pacific highlight that under a uniform benthic flux, the source of ε Nd from seafloor sediments is too non-radiogenic in our model to be able to accurately represent seawater measurements. Additionally, model–data mismatch in the northern North Atlantic alludes to the possibility of preferential contributions from “reactive” non-radiogenic detrital sediments. The new Nd isotope scheme forms an ... Text North Atlantic Copernicus Publications: E-Journals Pacific |
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Copernicus Publications: E-Journals |
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English |
description |
The neodymium (Nd) isotopic composition of seawater is a widely used ocean circulation tracer. However, uncertainty in quantifying the global ocean Nd budget, particularly constraining elusive non-conservative processes, remains a major challenge. A substantial increase in modern seawater Nd measurements from the GEOTRACES programme, coupled with recent hypotheses that a seafloor-wide benthic Nd flux to the ocean may govern global Nd isotope distributions ( ε Nd ), presents an opportunity to develop a new scheme specifically designed to test these paradigms. Here, we present the implementation of Nd isotopes ( 143 Nd and 144 Nd) into the ocean component of the FAMOUS coupled atmosphere–ocean general circulation model (Nd v1.0), a tool which can be widely used for simulating complex feedbacks between different Earth system processes on decadal to multi-millennial timescales. Using an equilibrium pre-industrial simulation tuned to represent the large-scale Atlantic Ocean circulation, we perform a series of sensitivity tests evaluating the new Nd isotope scheme. We investigate how Nd source and sink and cycling parameters govern global marine ε Nd distributions and provide an updated compilation of 6048 Nd concentrations and 3278 ε Nd measurements to assess model performance. Our findings support the notions that reversible scavenging is a key process for enhancing the Atlantic–Pacific basinal ε Nd gradient and is capable of driving the observed increase in Nd concentration along the global circulation pathway. A benthic flux represents a major source of Nd to the deep ocean. However, model–data disparities in the North Pacific highlight that under a uniform benthic flux, the source of ε Nd from seafloor sediments is too non-radiogenic in our model to be able to accurately represent seawater measurements. Additionally, model–data mismatch in the northern North Atlantic alludes to the possibility of preferential contributions from “reactive” non-radiogenic detrital sediments. The new Nd isotope scheme forms an ... |
format |
Text |
author |
Robinson, Suzanne Ivanovic, Ruza Gregoire, Lauren Tindall, Julia Flierdt, Tina Plancherel, Yves Pöppelmeier, Frerk Tachikawa, Kazuyo Valdes, Paul |
spellingShingle |
Robinson, Suzanne Ivanovic, Ruza Gregoire, Lauren Tindall, Julia Flierdt, Tina Plancherel, Yves Pöppelmeier, Frerk Tachikawa, Kazuyo Valdes, Paul Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions |
author_facet |
Robinson, Suzanne Ivanovic, Ruza Gregoire, Lauren Tindall, Julia Flierdt, Tina Plancherel, Yves Pöppelmeier, Frerk Tachikawa, Kazuyo Valdes, Paul |
author_sort |
Robinson, Suzanne |
title |
Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions |
title_short |
Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions |
title_full |
Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions |
title_fullStr |
Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions |
title_full_unstemmed |
Simulating marine neodymium isotope distributions using ND v1.0 coupled to the ocean component of the FAMOUS-MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions |
title_sort |
simulating marine neodymium isotope distributions using nd v1.0 coupled to the ocean component of the famous-moses1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2022-606 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-606/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-606 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-606/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-606 |
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1766135184154951680 |