Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces
International audience Dissolved and particulate Protactinium-231 ($^{231}$Pa) was analyzed for 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 inflowing waters from the Atlantic Ocean fuel the Ant...
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
2023
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Online Access: | https://hal.science/hal-04044045 https://hal.science/hal-04044045/document https://hal.science/hal-04044045/file/Pa-BGH-2022-submittedversion-1.pdf https://doi.org/10.1016/j.dsr.2022.103951 |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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ftuniversailles |
language |
English |
topic |
PANOPLY [SDU]Sciences of the Universe [physics] |
spellingShingle |
PANOPLY [SDU]Sciences of the Universe [physics] Levier, M. Roy-Barman, M. Foliot, L. Dapoigny, A. Lacan, F. Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
topic_facet |
PANOPLY [SDU]Sciences of the Universe [physics] |
description |
International audience Dissolved and particulate Protactinium-231 ($^{231}$Pa) was analyzed for 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 inflowing waters from the Atlantic Ocean fuel the Antarctic Circumpolar Current in dissolved $^{231}$Pa which is mostly removed from seawater by the biogenic silica produced by diatoms in the Southern Ocean. This scavenging flux of the $^{231}$Pa induces a meridional gradient of the $^{231}$Pa concentration and of the Th–Pa fractionation factor (F$_{Th/Pa}$).We propose a first direct estimate of the $^{231}$Pa partition coefficient between suspended opal and seawater of about 1.42 ± 0.55 × 10$^6$ g/g. This partition coefficient could directly apply to simulate the particulate Pa concentration from the dissolved fraction and the opal concentration. We apply to $^{231}$Pa the isopycnal advection-diffusion-scavenging model built for Th isotopes across the ACC. This additional constraint on the model does not modify the isopycnal eddy diffusion estimate of about 1900 ± 180 m$^2$/s at different isopycnal surfaces but suggests a higher particle settling velocity, about 1000 m/y, in the northern part of the ACC than solely derived from Th isotopes. The most different feature is the reduction by half of the estimated uncertainties among the different transport parameters just by the addition of a new constraining parameter. Moreover, this study confirms that $^{231}$Pa budget of the Atlantic Sector of Southern Ocean cannot be balanced by considering meridional transport only, and need to consider eastward export to scavenge Pa in the whole area of the Opal Belt. |
author2 |
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) Géochimie Des Impacts (GEDI) 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)) 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 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) ANR-07-BLAN-0146,BONUS-GOODHOPE(2007) |
format |
Article in Journal/Newspaper |
author |
Levier, M. Roy-Barman, M. Foliot, L. Dapoigny, A. Lacan, F. |
author_facet |
Levier, M. Roy-Barman, M. Foliot, L. Dapoigny, A. Lacan, F. |
author_sort |
Levier, M. |
title |
Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_short |
Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_full |
Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_fullStr |
Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_full_unstemmed |
Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces |
title_sort |
distribution of pa in the atlantic sector of the southern ocean: tracking scavenging during water mass mixing along neutral density surfaces |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04044045 https://hal.science/hal-04044045/document https://hal.science/hal-04044045/file/Pa-BGH-2022-submittedversion-1.pdf https://doi.org/10.1016/j.dsr.2022.103951 |
genre |
Antarc* Antarctic IPY Southern Ocean |
genre_facet |
Antarc* Antarctic IPY Southern Ocean |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-04044045 Deep Sea Research Part I: Oceanographic Research Papers, 2023, 194, pp.103951. ⟨10.1016/j.dsr.2022.103951⟩ https://www.sciencedirect.com/science/article/pii/S0967063722002643#abs0015 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2022.103951 hal-04044045 https://hal.science/hal-04044045 https://hal.science/hal-04044045/document https://hal.science/hal-04044045/file/Pa-BGH-2022-submittedversion-1.pdf doi:10.1016/j.dsr.2022.103951 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2022.103951 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
194 |
container_start_page |
103951 |
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spelling |
ftuniversailles:oai:HAL:hal-04044045v1 2024-04-28T07:57:15+00:00 Distribution of Pa in the Atlantic sector of the Southern Ocean: Tracking scavenging during water mass mixing along neutral density surfaces Levier, M. Roy-Barman, M. Foliot, L. Dapoigny, A. Lacan, F. 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) Géochimie Des Impacts (GEDI) 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)) 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 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) ANR-07-BLAN-0146,BONUS-GOODHOPE(2007) 2023-04 https://hal.science/hal-04044045 https://hal.science/hal-04044045/document https://hal.science/hal-04044045/file/Pa-BGH-2022-submittedversion-1.pdf https://doi.org/10.1016/j.dsr.2022.103951 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2022.103951 hal-04044045 https://hal.science/hal-04044045 https://hal.science/hal-04044045/document https://hal.science/hal-04044045/file/Pa-BGH-2022-submittedversion-1.pdf doi:10.1016/j.dsr.2022.103951 info:eu-repo/semantics/OpenAccess ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-04044045 Deep Sea Research Part I: Oceanographic Research Papers, 2023, 194, pp.103951. ⟨10.1016/j.dsr.2022.103951⟩ https://www.sciencedirect.com/science/article/pii/S0967063722002643#abs0015 PANOPLY [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftuniversailles https://doi.org/10.1016/j.dsr.2022.103951 2024-04-04T17:27:27Z International audience Dissolved and particulate Protactinium-231 ($^{231}$Pa) was analyzed for 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 inflowing waters from the Atlantic Ocean fuel the Antarctic Circumpolar Current in dissolved $^{231}$Pa which is mostly removed from seawater by the biogenic silica produced by diatoms in the Southern Ocean. This scavenging flux of the $^{231}$Pa induces a meridional gradient of the $^{231}$Pa concentration and of the Th–Pa fractionation factor (F$_{Th/Pa}$).We propose a first direct estimate of the $^{231}$Pa partition coefficient between suspended opal and seawater of about 1.42 ± 0.55 × 10$^6$ g/g. This partition coefficient could directly apply to simulate the particulate Pa concentration from the dissolved fraction and the opal concentration. We apply to $^{231}$Pa the isopycnal advection-diffusion-scavenging model built for Th isotopes across the ACC. This additional constraint on the model does not modify the isopycnal eddy diffusion estimate of about 1900 ± 180 m$^2$/s at different isopycnal surfaces but suggests a higher particle settling velocity, about 1000 m/y, in the northern part of the ACC than solely derived from Th isotopes. The most different feature is the reduction by half of the estimated uncertainties among the different transport parameters just by the addition of a new constraining parameter. Moreover, this study confirms that $^{231}$Pa budget of the Atlantic Sector of Southern Ocean cannot be balanced by considering meridional transport only, and need to consider eastward export to scavenge Pa in the whole area of the Opal Belt. Article in Journal/Newspaper Antarc* Antarctic IPY Southern Ocean Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Deep Sea Research Part I: Oceanographic Research Papers 194 103951 |