Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach
The overall objective of this thesis is to further our understanding of ocean biogeochemical cycles (sources, internal cycles, sinks) using tracers present in seawater (the concentration of dissolved aluminium and the isotopic composition of dissolved iron) combined with hydrodynamic tools. Aluminum...
Main Author: | |
---|---|
Other Authors: | , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
Published: |
HAL CCSD
2020
|
Subjects: | |
Online Access: | https://theses.hal.science/tel-03205714 https://theses.hal.science/tel-03205714/document https://theses.hal.science/tel-03205714/file/2020TOU30214b.pdf |
id |
ftutoulouse3hal:oai:HAL:tel-03205714v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
French |
topic |
Dissolved aluminum Iron isotopes EOMPA Lagrangian experiment Austral ocean Subtropical North Atlantic ocean GEOTRACES KEOPS GApr08 Aluminium dissous Isotopes de fer Expériences Lagrangiennes Océan Austral Océan Atlantique Nord subtropical [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Dissolved aluminum Iron isotopes EOMPA Lagrangian experiment Austral ocean Subtropical North Atlantic ocean GEOTRACES KEOPS GApr08 Aluminium dissous Isotopes de fer Expériences Lagrangiennes Océan Austral Océan Atlantique Nord subtropical [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Artigue, Lise Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach |
topic_facet |
Dissolved aluminum Iron isotopes EOMPA Lagrangian experiment Austral ocean Subtropical North Atlantic ocean GEOTRACES KEOPS GApr08 Aluminium dissous Isotopes de fer Expériences Lagrangiennes Océan Austral Océan Atlantique Nord subtropical [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
The overall objective of this thesis is to further our understanding of ocean biogeochemical cycles (sources, internal cycles, sinks) using tracers present in seawater (the concentration of dissolved aluminium and the isotopic composition of dissolved iron) combined with hydrodynamic tools. Aluminum is used as a tracer from lithogenic sources to the ocean, while iron isotopes tell us about the iron cycle in the ocean. This thesis focuses first on the analysis of water masses of the 22ºN longitudinal section in the North Atlantic carried out in the framework of the GEOTRACES GApr08 campaign. This study combines for the first time an extended optimum multiparameter analysis (eOMPA) of water masses with an estimation of their Lagrangian trajectories from a hydrodynamic model. In addition, the dissolved aluminium (dAl) measurements carried out have made it possible to produce a first section of dAl at 22ºN and these same tools have enabled an advanced analysis. The joint use of the 1D model of surface dust advection-deposition and the eOMPA results highlighted the predominant processes associated with the measured dAl concentrations. (i) At the surface, both advection and deposition of atmospheric dust are essential to explain the observed dAl concentrations, although in the west, an additional external source is required. This source could come either from the Amazon River or from erosion in the Petites Antilles. (ii) Between 200 and 800m, in an area of strong atmospheric deposition (below the Saharan plume), high dAl concentrations result from oceanic transport. The net balance of dissolved-particle interactions, however, is a subtraction of dAl, probably by adsorption onto particles. (iii) Below 800 m, the effect of dissolved-particle interactions is reversed and reversible scavenging results in a net source of dAl. (iv) Below 3340 m, the Snakepit hydrothermal source is found to be a significant local source of dAl. Unlike aluminium, iron (Fe) is an essential micronutrient for primary production. This ... |
author2 |
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) Université Paul Sabatier - Toulouse III François Lacan |
format |
Doctoral or Postdoctoral Thesis |
author |
Artigue, Lise |
author_facet |
Artigue, Lise |
author_sort |
Artigue, Lise |
title |
Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach |
title_short |
Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach |
title_full |
Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach |
title_fullStr |
Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach |
title_full_unstemmed |
Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach |
title_sort |
marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://theses.hal.science/tel-03205714 https://theses.hal.science/tel-03205714/document https://theses.hal.science/tel-03205714/file/2020TOU30214b.pdf |
genre |
Austral Ocean North Atlantic |
genre_facet |
Austral Ocean North Atlantic |
op_source |
https://theses.hal.science/tel-03205714 Océanographie. Université Paul Sabatier - Toulouse III, 2020. Français. ⟨NNT : 2020TOU30214⟩ |
op_relation |
NNT: 2020TOU30214 tel-03205714 https://theses.hal.science/tel-03205714 https://theses.hal.science/tel-03205714/document https://theses.hal.science/tel-03205714/file/2020TOU30214b.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1810432956195405824 |
spelling |
ftutoulouse3hal:oai:HAL:tel-03205714v1 2024-09-15T17:56:44+00:00 Marine biogeochemical cycles : contributions of the aluminium concentration, and iron isotope tracers, coupled to a hydrodynamic approach Cycles biogéochimiques océaniques : apports des traceurs élémentaires et isotopiques, l'aluminium et le fer couplés à une approche hydrodynamique Artigue, Lise 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) Université Paul Sabatier - Toulouse III François Lacan 2020-06-03 https://theses.hal.science/tel-03205714 https://theses.hal.science/tel-03205714/document https://theses.hal.science/tel-03205714/file/2020TOU30214b.pdf fr fre HAL CCSD NNT: 2020TOU30214 tel-03205714 https://theses.hal.science/tel-03205714 https://theses.hal.science/tel-03205714/document https://theses.hal.science/tel-03205714/file/2020TOU30214b.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03205714 Océanographie. Université Paul Sabatier - Toulouse III, 2020. Français. ⟨NNT : 2020TOU30214⟩ Dissolved aluminum Iron isotopes EOMPA Lagrangian experiment Austral ocean Subtropical North Atlantic ocean GEOTRACES KEOPS GApr08 Aluminium dissous Isotopes de fer Expériences Lagrangiennes Océan Austral Océan Atlantique Nord subtropical [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/doctoralThesis Theses 2020 ftutoulouse3hal 2024-06-25T00:12:59Z The overall objective of this thesis is to further our understanding of ocean biogeochemical cycles (sources, internal cycles, sinks) using tracers present in seawater (the concentration of dissolved aluminium and the isotopic composition of dissolved iron) combined with hydrodynamic tools. Aluminum is used as a tracer from lithogenic sources to the ocean, while iron isotopes tell us about the iron cycle in the ocean. This thesis focuses first on the analysis of water masses of the 22ºN longitudinal section in the North Atlantic carried out in the framework of the GEOTRACES GApr08 campaign. This study combines for the first time an extended optimum multiparameter analysis (eOMPA) of water masses with an estimation of their Lagrangian trajectories from a hydrodynamic model. In addition, the dissolved aluminium (dAl) measurements carried out have made it possible to produce a first section of dAl at 22ºN and these same tools have enabled an advanced analysis. The joint use of the 1D model of surface dust advection-deposition and the eOMPA results highlighted the predominant processes associated with the measured dAl concentrations. (i) At the surface, both advection and deposition of atmospheric dust are essential to explain the observed dAl concentrations, although in the west, an additional external source is required. This source could come either from the Amazon River or from erosion in the Petites Antilles. (ii) Between 200 and 800m, in an area of strong atmospheric deposition (below the Saharan plume), high dAl concentrations result from oceanic transport. The net balance of dissolved-particle interactions, however, is a subtraction of dAl, probably by adsorption onto particles. (iii) Below 800 m, the effect of dissolved-particle interactions is reversed and reversible scavenging results in a net source of dAl. (iv) Below 3340 m, the Snakepit hydrothermal source is found to be a significant local source of dAl. Unlike aluminium, iron (Fe) is an essential micronutrient for primary production. This ... Doctoral or Postdoctoral Thesis Austral Ocean North Atlantic Université Toulouse III - Paul Sabatier: HAL-UPS |