Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces
International audience The distributions of dissolved and particulate thorium isotopes (230 Th and 232 Th) were established in samples from the BONUS GoodHope (BGH) IPY-GEOTRACES cruise in the SE Atlantic sector of the Southern Ocean (36°S-13°E to 57°S-0°, Feb.-Mar. 2008). The distribution of total...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.archives-ouvertes.fr/hal-02410096 https://hal.archives-ouvertes.fr/hal-02410096/document https://hal.archives-ouvertes.fr/hal-02410096/file/Roy-Barman%20et%20al%20DSR_revised%20version%20with%20ES.pdf https://doi.org/10.1016/j.dsr.2019.05.002 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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language |
English |
topic |
thorium isotopes Southern Ocean Atlantic marine particles isopycnal mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
thorium isotopes Southern Ocean Atlantic marine particles isopycnal mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Roy-Barman, Matthieu Thil, François Bordier, Louise Dapoigny, Arnaud Foliot, lorna Ayrault, Sophie Lacan, François Jeandel, Catherine Pradoux, Catherine Garcia-Solsona, Ester Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
topic_facet |
thorium isotopes Southern Ocean Atlantic marine particles isopycnal mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience The distributions of dissolved and particulate thorium isotopes (230 Th and 232 Th) were established in samples from the BONUS GoodHope (BGH) IPY-GEOTRACES cruise in the SE Atlantic sector of the Southern Ocean (36°S-13°E to 57°S-0°, Feb.-Mar. 2008). The distribution of total (dissolved+particulate) 232 Th is dominated by the inputs from continental margins. The non-linear profiles of dissolved 230 Th are interpreted as due to the southward upwelling of the isopycnal surfaces. However, total 230 Th and 232 Th versus salinity plots illustrate departures from binary mixing and provides evidence for non-conservative behavior of both isotopes along the section. We propose a model for total 230 Th and 232 Th scavenging and mixing along isopycnal surfaces. We use this model to estimate particle settling speeds and isopycnal eddy diffusion coefficients along the BGH section. Data-model comparison suggests particle settling velocities in the range of 400-700 m/y and isopycnal eddy diffusivity of the order of 2000 m 2 /s. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochimie Des Impacts (GEDI) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochrononologie Traceurs Archéométrie (GEOTRAC) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Roy-Barman, Matthieu Thil, François Bordier, Louise Dapoigny, Arnaud Foliot, lorna Ayrault, Sophie Lacan, François Jeandel, Catherine Pradoux, Catherine Garcia-Solsona, Ester |
author_facet |
Roy-Barman, Matthieu Thil, François Bordier, Louise Dapoigny, Arnaud Foliot, lorna Ayrault, Sophie Lacan, François Jeandel, Catherine Pradoux, Catherine Garcia-Solsona, Ester |
author_sort |
Roy-Barman, Matthieu |
title |
Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_short |
Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_full |
Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_fullStr |
Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_full_unstemmed |
Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_sort |
thorium isotopes in the southeast atlantic ocean: tracking scavenging during water mass mixing along neutral density surfaces |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02410096 https://hal.archives-ouvertes.fr/hal-02410096/document https://hal.archives-ouvertes.fr/hal-02410096/file/Roy-Barman%20et%20al%20DSR_revised%20version%20with%20ES.pdf https://doi.org/10.1016/j.dsr.2019.05.002 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
IPY Southern Ocean |
genre_facet |
IPY Southern Ocean |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.archives-ouvertes.fr/hal-02410096 Deep Sea Research Part I: Oceanographic Research Papers, Elsevier, 2019, 149, pp.103042. ⟨10.1016/j.dsr.2019.05.002⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2019.05.002 hal-02410096 https://hal.archives-ouvertes.fr/hal-02410096 https://hal.archives-ouvertes.fr/hal-02410096/document https://hal.archives-ouvertes.fr/hal-02410096/file/Roy-Barman%20et%20al%20DSR_revised%20version%20with%20ES.pdf doi:10.1016/j.dsr.2019.05.002 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2019.05.002 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
149 |
container_start_page |
103042 |
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1766046899536658432 |
spelling |
ftccsdartic:oai:HAL:hal-02410096v1 2023-05-15T16:55:51+02:00 Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces Roy-Barman, Matthieu Thil, François Bordier, Louise Dapoigny, Arnaud Foliot, lorna Ayrault, Sophie Lacan, François Jeandel, Catherine Pradoux, Catherine Garcia-Solsona, Ester Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochimie Des Impacts (GEDI) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochrononologie Traceurs Archéométrie (GEOTRAC) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) 2019-07 https://hal.archives-ouvertes.fr/hal-02410096 https://hal.archives-ouvertes.fr/hal-02410096/document https://hal.archives-ouvertes.fr/hal-02410096/file/Roy-Barman%20et%20al%20DSR_revised%20version%20with%20ES.pdf https://doi.org/10.1016/j.dsr.2019.05.002 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2019.05.002 hal-02410096 https://hal.archives-ouvertes.fr/hal-02410096 https://hal.archives-ouvertes.fr/hal-02410096/document https://hal.archives-ouvertes.fr/hal-02410096/file/Roy-Barman%20et%20al%20DSR_revised%20version%20with%20ES.pdf doi:10.1016/j.dsr.2019.05.002 info:eu-repo/semantics/OpenAccess ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.archives-ouvertes.fr/hal-02410096 Deep Sea Research Part I: Oceanographic Research Papers, Elsevier, 2019, 149, pp.103042. ⟨10.1016/j.dsr.2019.05.002⟩ thorium isotopes Southern Ocean Atlantic marine particles isopycnal mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1016/j.dsr.2019.05.002 2021-12-19T00:39:53Z International audience The distributions of dissolved and particulate thorium isotopes (230 Th and 232 Th) were established in samples from the BONUS GoodHope (BGH) IPY-GEOTRACES cruise in the SE Atlantic sector of the Southern Ocean (36°S-13°E to 57°S-0°, Feb.-Mar. 2008). The distribution of total (dissolved+particulate) 232 Th is dominated by the inputs from continental margins. The non-linear profiles of dissolved 230 Th are interpreted as due to the southward upwelling of the isopycnal surfaces. However, total 230 Th and 232 Th versus salinity plots illustrate departures from binary mixing and provides evidence for non-conservative behavior of both isotopes along the section. We propose a model for total 230 Th and 232 Th scavenging and mixing along isopycnal surfaces. We use this model to estimate particle settling speeds and isopycnal eddy diffusion coefficients along the BGH section. Data-model comparison suggests particle settling velocities in the range of 400-700 m/y and isopycnal eddy diffusivity of the order of 2000 m 2 /s. Article in Journal/Newspaper IPY Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Deep Sea Research Part I: Oceanographic Research Papers 149 103042 |