Preprints
https://doi.org/10.5194/egusphere-2022-606
https://doi.org/10.5194/egusphere-2022-606
21 Sep 2022
 | 21 Sep 2022

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

Suzanne Robinson, Ruza Ivanovic, Lauren Gregoire, Julia Tindall, Tina van de Flierdt, Yves Plancherel, Frerk Pöppelmeier, Kazuyo Tachikawa, and Paul Valdes

Abstract. 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 (εNd) presents an opportunity to develop a new scheme specifically designed to test these paradigms. Here, we present the implementation of Nd isotopes (143Nd and 144Nd) 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 largescale Atlantic Ocean circulation, we perform a series of sensitivity tests evaluating the new Nd isotope scheme. We investigate how Nd source/sink and cycling parameters govern global marine εNd distributions, and provide an updated compilation of 6,048 Nd concentration and 3,278 εNd measurements to assess model performance. Our findings support the notions that reversible scavenging is a key process for enhancing the Atlantic-Pacific basinal εNd 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 the source of εNd from seafloor sediment is too unradiogenic in our model with a constant benthic flux. Additionally, model-data mismatch in the northern North Atlantic suggests a missing source of Nd that is much more unradiogenic than the bulk sediment, alluding to the possibility of preferential contributions from ‘reactive’ detrital sediments under a benthic flux driven model of marine Nd cycling.

The new Nd isotope scheme forms an excellent tool for exploring global marine Nd cycling and the interplay between climatic and oceanographic conditions under both modern and palaeoceanographic contexts.

Journal article(s) based on this preprint

22 Feb 2023
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
Suzanne Robinson, Ruza F. Ivanovic, Lauren J. Gregoire, Julia Tindall, Tina van de Flierdt, Yves Plancherel, Frerk Pöppelmeier, Kazuyo Tachikawa, and Paul J. Valdes
Geosci. Model Dev., 16, 1231–1264, https://doi.org/10.5194/gmd-16-1231-2023,https://doi.org/10.5194/gmd-16-1231-2023, 2023
Short summary
Suzanne Robinson, Ruza Ivanovic, Lauren Gregoire, Julia Tindall, Tina van de Flierdt, Yves Plancherel, Frerk Pöppelmeier, Kazuyo Tachikawa, and Paul Valdes

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-606', Benoit Pasquier, 24 Oct 2022
    • RC3: 'Reply on RC1', Benoit Pasquier, 01 Nov 2022
    • AC1: 'Reply on RC1', Suzanne Robinson, 10 Jan 2023
  • CC1: 'Comment on egusphere-2022-606', Tristan Vadsaria, 28 Oct 2022
    • AC2: 'Reply on CC1', Suzanne Robinson, 10 Jan 2023
  • RC2: 'Comment on egusphere-2022-606', Catherine Jeandel, 01 Nov 2022
    • AC3: 'Reply on RC2', Suzanne Robinson, 10 Jan 2023
  • RC4: 'Comment on egusphere-2022-606', Ed Hathorne, 02 Nov 2022
    • AC4: 'Reply on RC4', Suzanne Robinson, 10 Jan 2023
  • RC5: 'Comment on egusphere-2022-606', Torben Stichel, 04 Nov 2022
    • AC5: 'Reply on RC5', Suzanne Robinson, 10 Jan 2023
  • AC6: 'Comment on egusphere-2022-606', Suzanne Robinson, 10 Jan 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-606', Benoit Pasquier, 24 Oct 2022
    • RC3: 'Reply on RC1', Benoit Pasquier, 01 Nov 2022
    • AC1: 'Reply on RC1', Suzanne Robinson, 10 Jan 2023
  • CC1: 'Comment on egusphere-2022-606', Tristan Vadsaria, 28 Oct 2022
    • AC2: 'Reply on CC1', Suzanne Robinson, 10 Jan 2023
  • RC2: 'Comment on egusphere-2022-606', Catherine Jeandel, 01 Nov 2022
    • AC3: 'Reply on RC2', Suzanne Robinson, 10 Jan 2023
  • RC4: 'Comment on egusphere-2022-606', Ed Hathorne, 02 Nov 2022
    • AC4: 'Reply on RC4', Suzanne Robinson, 10 Jan 2023
  • RC5: 'Comment on egusphere-2022-606', Torben Stichel, 04 Nov 2022
    • AC5: 'Reply on RC5', Suzanne Robinson, 10 Jan 2023
  • AC6: 'Comment on egusphere-2022-606', Suzanne Robinson, 10 Jan 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Suzanne Robinson on behalf of the Authors (10 Jan 2023)  Author's response   Author's tracked changes   Manuscript 
EF by Polina Shvedko (10 Jan 2023)  Supplement 
ED: Publish subject to technical corrections (24 Jan 2023) by Andrew Yool
AR by Suzanne Robinson on behalf of the Authors (30 Jan 2023)  Manuscript 

Journal article(s) based on this preprint

22 Feb 2023
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
Suzanne Robinson, Ruza F. Ivanovic, Lauren J. Gregoire, Julia Tindall, Tina van de Flierdt, Yves Plancherel, Frerk Pöppelmeier, Kazuyo Tachikawa, and Paul J. Valdes
Geosci. Model Dev., 16, 1231–1264, https://doi.org/10.5194/gmd-16-1231-2023,https://doi.org/10.5194/gmd-16-1231-2023, 2023
Short summary
Suzanne Robinson, Ruza Ivanovic, Lauren Gregoire, Julia Tindall, Tina van de Flierdt, Yves Plancherel, Frerk Pöppelmeier, Kazuyo Tachikawa, and Paul Valdes
Suzanne Robinson, Ruza Ivanovic, Lauren Gregoire, Julia Tindall, Tina van de Flierdt, Yves Plancherel, Frerk Pöppelmeier, Kazuyo Tachikawa, and Paul Valdes

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Latest update: 27 Jan 2024
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Short summary
We present the implementation of neodymium (Nd) isotopes into the ocean model of FAMOUS (ND v1.0). Nd fluxes from seafloor sediment alongside incorporation of Nd onto sinking particles represent the major global sources and sinks. However, model-data mismatch in the North Pacific and northern North Atlantic suggest that certain reactive components of the sediment interact the most with seawater. Our results are important for interpreting Nd isotopes in terms of ocean circulation.