Dissolved neodymium and hafnium isotopes and rare earth elements in the Congo River Plume: Tracing and quantifying continental inputs into the southeast Atlantic

Rahlf, Peer; Laukert, Georgi; Hathorne, Ed C; Vieira, Lúcia Helena

doi:10.1016/j.gca.2020.11.017

Cited by 17 publications

(31 citation statements)

References 84 publications

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“…The [Nd] and ε Nd observations used in this study consist of the following three datasets: (i) the pre-GEOTRACES compilation of Nd and ε Nd data by van de Flierdt et al (2016a), (ii) the GEOTRACES Intermediate Data Product 2017 (IDP17; Schlitzer et al, 2018) (including specifically Nd-linked publications; Stichel et al, 2012aStichel et al, , b, 2015Garcia-Solsona et al, 2014;Basak et al, 2015;Fröllje et al, 2016;Lambelet et al, 2016Lambelet et al, , 2018Behrens et al, 2018a, b), and (iii) our post-IDP17 compilation of data from the Indian Ocean (Amakawa et al, 2019), the Barents Sea (Laukert et al, 2018;Laukert et al, 2019), the northern Iceland Basin (Morrison et al, 2019), the northwestern Pacific (Che and Zhang, 2018), the Kerguelen Plateau (Grenier et al, 2018), the southeastern Atlantic Ocean (GA08, Rahlf et al, 2020;Rahlf et al, 2019;Rahlf et al, 2021;Rahlf et al, 2020), the Bay of Biscay (Dausmann et al, 2020;Dausmann et al, 2019), the western North Atlantic , the Arctic (Laukert et al, 2017;Laukert et al, 2017a, d), and the Bermuda Atlantic Time-series Study (BATS; Laukert et al, 2017;Laukert et al, 2017b, c). The spatial distribution of these observations as used in this study are shown in Fig.…”

Section: Dissolved Neodymium and ε Nd Datamentioning

confidence: 99%

GNOM v1.0: an optimized steady-state model of the modern marine neodymium cycle

et al. 2022

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Abstract. Spatially distant sources of neodymium (Nd) to the ocean that carry different isotopic signatures (εNd) have been shown to trace out major water masses and have thus been extensively used to study large-scale features of the ocean circulation both past and current. While the global marine Nd cycle is qualitatively well understood, a complete quantitative determination of all its components and mechanisms, such as the magnitude of its sources and the paradoxical conservative behavior of εNd, remains elusive. To make sense of the increasing collection of observational Nd and εNd data, in this model description paper we present and describe the Global Neodymium Ocean Model (GNOM) v1.0, the first inverse model of the global marine biogeochemical cycle of Nd. The GNOM is embedded in a data-constrained steady-state circulation that affords spectacular computational efficiency, which we leverage to perform systematic objective optimization, allowing us to make preliminary estimates of biogeochemical parameters. Owing to its matrix representation, the GNOM model is additionally amenable to novel diagnostics that allow us to investigate open questions about the Nd cycle with unprecedented accuracy. This model is open-source and freely accessible, is written in Julia, and its code is easily understandable and modifiable for further community developments, refinements, and experiments.

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Section: Dissolved Neodymium and ε Nd Datamentioning

confidence: 99%

GNOM v1.0: an optimized steady-state model of the modern marine neodymium cycle

et al. 2022

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“…The [Nd] and ε Nd observations used in this study consist of 3 datasets: (i) the pre-GEOTRACES compilation of Nd and ε Nd data by van de Flierdt et al ( 2016), (ii) the GEOTRACES Intermediate Data Product 2017 (IDP17, Schlitzer et al, 2018) (including specifically Nd-linked publications: Stichel et al, 2012aStichel et al, , b, 2015Garcia-Solsona et al, 2014;Basak et al, 2015;Fröllje et al, 2016;Lambelet et al, 2016Lambelet et al, , 2018Behrens et al, 2018a, b), and (iii) our post-IDP17 compilation of data from the Indian Ocean (Amakawa et al, 2019), the Barents Sea (Laukert et al, 2018;Laukert et al, 2019), the northern Iceland Basin (Morrison et al, 2019), the Northwestern Pacific (Che and Zhang, 2018), the Kerguelen Plateau (Grenier et al, 2018), the southeastern Atlantic Ocean (GA08, Rahlf et al, 2019;Rahlf et al, 2021;, the Bay of Biscay (Dausmann et al, 2020;Dausmann et al, 2019), the Western North Atlantic , the Arctic Laukert et al, 2017a, d), and the Bermuda Atlantic Time-series Study (BATS; Laukert et al, 2017b, c). The spatial distribution of these observations as used in this study are shown in Fig.…”

Section: Neodymium and ε Nd Datamentioning

confidence: 99%

GNOM v1.0: An optimized steady-state model of the modern marine neodymium cycle

Pasquier

Hines

Liang

et al. 2021

Preprint

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Abstract. Spatially distant sources of neodymium (Nd) to the ocean that carry different isotopic signatures (εNd) have been shown to trace out major water masses, and have thus been extensively used to study large-scale features of the ocean circulation both past and current. While the global marine Nd cycle is qualitatively well understood, a complete quantitative determination of all its components and mechanisms, such as the magnitude of its sources and the paradoxical conservative behavior of εNd, remains elusive. To make sense of the increasing collection of observational Nd and εNd data, we develop the global neodymium ocean model (GNOM) v1, the first inverse model of the global marine biogeochemical cycle of Nd. The GNOM is embedded in a data-constrained steady-state circulation that affords spectacular computational efficiency, which we leverage to estimate biogeochemical parameters via systematic objective optimization. Owing to its matrix representation, the GNOM model is additionally amenable to novel diagnostics that allow us to investigate open questions about the Nd cycle with unprecedented accuracy. The GNOM is open-source and freely accessible, is written in Julia, and its code is easily understandable and modifiable for further developments and experiments.

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“…The use of rare earth element concentrations (REE) and neodymium isotopic compositions (Nd-IC) in marine geochemistry has been conducted for more than 30 years (Jeandel, 1993;Sholkovitz et al, 1999;Elderfield et al, 2006;Stichel et al, 2012;Stichel et al, 2015;Fröllje et al, 2016;Behrens et al, 2018a;Behrens et al, 2018b;Lambelet et al, 2018;Amakawa et al, 2019;Pham et al, 2019;Stichel et al, 2020;Rahlf et al, 2021). The isotopic composition of Nd is a very powerful tracer that allows the characterization of the sources of lithogenic elements to the ocean.…”

Section: Introductionmentioning

confidence: 99%

Neodymium Isotopic Composition and Rare Earth Element Concentration Variations in the Coral and Solomon Seas

Pham¹,

Jeandel²,

Grenier³

et al. 2022

Front. Environ. Chem.

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Significant progress has been made in the last decade on the understanding of the role of the Coral and Solomon Seas as major suppliers of waters and chemical elements to the equatorial Pacific. Yet, the location, depth, and processes of chemical enrichment of these waters remain poorly constrained. Neodymium (Nd) isotopic compositions (εNd) and rare earth element concentrations (REE) are powerful tracers of land-ocean chemical exchanges. Combined, they can greatly refine the characterization of these exchanges. Here we report profiles of εNd at 21 stations located in the Coral and Solomon Seas as part of the GEOTRACES GP-12 cruise that complement the rare earth element concentration (REE) profiles of Pham (Chemical Geology, 2019, 524 (May), 11–36). Waters exiting the Solomon Sea are generally slightly more radiogenic than the incoming ones, suggesting inputs of radiogenic material along their pathways across the Solomon Sea. This radiogenic material is brought to the surface waters via natural processes (rivers, volcanic dusts) and likely local mining activities. Noticeable εNd increases are also observed in subsurface and intermediate layers. All these processes indicate the occurrence of local Boundary Exchange (BE) processes, which are estimated to occur within a few days. Coupling hydrological and chemical tracers allows highlighting the land-ocean interactions affecting some water layers and quantifying the exchanged fluxes of Nd. Modifications of the Nd concentration and isotopic composition in the lower thermocline layer require an external flux of 7.9 ± 2.0 t(Nd)/yr only partly balanced by a scavenging flux of 1.8 ± 2.3 t(Nd)/yr, leading to a net influx of 6.1 ± 1.7 t(Nd)/yr. Regarding the Upper Circumpolar Deep Water, a total net flux of 105 ± 50 t(Nd)/yr is estimated, the external flux is relatively high (86 ± 31 t(Nd)/yr while the scavenging flux remains. These results refine the role of the Solomon Sea as a supplier of continental chemical elements to the Pacific equatorial waters.

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Dissolved neodymium and hafnium isotopes and rare earth elements in the Congo River Plume: Tracing and quantifying continental inputs into the southeast Atlantic

Cited by 17 publications

References 84 publications

GNOM v1.0: an optimized steady-state model of the modern marine neodymium cycle

GNOM v1.0: an optimized steady-state model of the modern marine neodymium cycle

GNOM v1.0: An optimized steady-state model of the modern marine neodymium cycle

Neodymium Isotopic Composition and Rare Earth Element Concentration Variations in the Coral and Solomon Seas

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