Academic Journal
Neodymium budget in the Mediterranean Sea: Evaluating the role of atmospheric dusts using a high-resolution dynamical-biogeochemical model
| Title: | Neodymium budget in the Mediterranean Sea: Evaluating the role of atmospheric dusts using a high-resolution dynamical-biogeochemical model |
|---|---|
| Authors: | Mohamed Ayache, Jean-Claude Dutay, Kazuyo Tachikawa, Thomas Arsouze, Catherine Jeandel |
| Contributors: | Aptel, Florence, Barcelona Supercomputing Center, 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), Modélisation du climat (CLIM), 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)), Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Barcelona Supercomputing Center - Centro Nacional de Supercomputacion (BSC-CNS), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
| Source: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Biogeosciences, Vol 20, Pp 205-227 (2023) |
| Publisher Information: | Copernicus GmbH, 2022. |
| Publication Year: | 2022 |
| Subject Terms: | Neodymium, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, QE1-996.5, Ecology, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, Mediterranean basin, Geology, Neodymium (Nd), Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida, 01 natural sciences, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment, Atmospheric dusts, Life, 13. Climate action, QH501-531, Simulació per ordinador, 14. Life underwater, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, QH540-549.5, 0105 earth and related environmental sciences |
| Description: | The relative importance of river solid discharge, deposited sediment remobilisation and atmospheric dust as sources of neodymium (Nd) to the ocean is the subject of ongoing debate, the magnitudes of these fluxes being associated with a significant uncertainty. The Mediterranean basin is a specific basin; it receives a vast amount of emissions from different sources and is surrounded by continental margins, with a significant input of dust as compared to the global ocean. Furthermore, it is largely impacted by the Atlantic water inflow via the Strait of Gibraltar. Here, we present the first simulation of dissolved Nd concentration ([Nd]) and Nd isotopic composition (εNd) in the Mediterranean Sea using a high-resolution regional model (NEMO/MED12/PISCES) with an explicit representation of all Nd inputs, and the internal cycle, i.e. the interactions between the particulate and dissolved phases. The high resolution of the oceanic model (at 1/12°), essential to the simulation of a realistic Mediterranean circulation in present-day conditions, gives a unique opportunity to better apprehend the processes governing the Nd distribution in the marine environment. The model succeeds in simulating the main features of εNd and produces a realistic distribution of [Nd] in the Mediterranean Sea. We estimated the boundary exchange (BE, which represents the transfer of elements from the margin to the sea and their removal by scavenging) flux at 89.43 × 106 g(Nd)/yr, representing ~90 % of the total external Nd source to the Mediterranean basin. The river discharge provided 3.66 × 106 g(Nd)/yr, or 3.7 % of the total Nd flow into the Mediterranean. The flux of Nd from partially dissolved atmospheric dusts was estimated at 5.2 × 106 g(Nd)/yr, representing 5.3 % of the total Nd input. This work highlights that the impact of river discharge on [Nd] is localized near the catchments of the main rivers. In contrast, the atmospheric dust input has a basin-wide influence, correcting for a tooradiogenic εNd when only the BE input is considered, and improving the agreement of simulated dissolved Nd concentration with field data. This work also suggests that εNd is sensitive to the spatial distribution of Nd in the atmospheric dust, and that the parametrisation of the vertical cycling (scavenging/remineralisation) considerably constrains the ability of the model to simulate the vertical profile of εNd. |
| Document Type: | Article Other literature type |
| File Description: | application/pdf |
| ISSN: | 1726-4189 |
| DOI: | 10.5194/bg-2022-107 |
| DOI: | 10.5194/bg-20-205-2023 |
| Access URL: | https://bg.copernicus.org/articles/20/205/2023/ https://doaj.org/article/b8abe7ef92414594935a7419857662a3 https://hal.science/hal-03941352v1 https://doi.org/10.5194/bg-20-205-2023 https://hal.science/hal-03941352v1/document |
| Rights: | CC BY |
| Accession Number: | edsair.doi.dedup.....3b1a6cb0f3d4ed74259a8e08ab7dcadc |
| Database: | OpenAIRE |
| ISSN: | 17264189 |
|---|---|
| DOI: | 10.5194/bg-2022-107 |