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.science/hal-02410096 https://hal.science/hal-02410096/document https://hal.science/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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ftunivnantes:oai:HAL:hal-02410096v1 |
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openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
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) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géochimie Des Impacts (GEDI) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 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) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -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.science/hal-02410096 https://hal.science/hal-02410096/document https://hal.science/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.science/hal-02410096 Deep Sea Research Part I: Oceanographic Research Papers, 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.science/hal-02410096 https://hal.science/hal-02410096/document https://hal.science/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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1766046897735204864 |
spelling |
ftunivnantes: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) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géochimie Des Impacts (GEDI) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 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) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) 2019-07 https://hal.science/hal-02410096 https://hal.science/hal-02410096/document https://hal.science/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.science/hal-02410096 https://hal.science/hal-02410096/document https://hal.science/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.science/hal-02410096 Deep Sea Research Part I: Oceanographic Research Papers, 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 ftunivnantes https://doi.org/10.1016/j.dsr.2019.05.002 2023-02-22T04:16:41Z 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 Université de Nantes: HAL-UNIV-NANTES Southern Ocean Deep Sea Research Part I: Oceanographic Research Papers 149 103042 |