The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean
International audience Published scavenging models generally assume that the 231Pa/230Th ratios of surface sediments are primarily determined by the mass flux of particles. In this study we compare the 230Th normalized vertical fluxes of both total sediments and opal to the 231Pa/230Th ratios measur...
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.archives-ouvertes.fr/hal-00291368 https://doi.org/10.1016/S0304-4203(02)00070-1 |
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ftccsdartic:oai:HAL:hal-00291368v1 2023-05-15T13:32:14+02:00 The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean Dezileau, L. Bareille, Gilles Reyss, J.L. Universidad de Concepción - University of Concepcion Chile Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE) Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) 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) Océan et Interfaces (OCEANIS) 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) 2003 https://hal.archives-ouvertes.fr/hal-00291368 https://doi.org/10.1016/S0304-4203(02)00070-1 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0304-4203(02)00070-1 hal-00291368 https://hal.archives-ouvertes.fr/hal-00291368 doi:10.1016/S0304-4203(02)00070-1 ISSN: 0304-4203 Marine Chemistry https://hal.archives-ouvertes.fr/hal-00291368 Marine Chemistry, Elsevier, 2003, 81 (03/04/08), pp.105-117. ⟨10.1016/S0304-4203(02)00070-1⟩ Opal flux Southern Ocean 231Pa/230Th ratio [CHIM.ANAL]Chemical Sciences/Analytical chemistry info:eu-repo/semantics/article Journal articles 2003 ftccsdartic https://doi.org/10.1016/S0304-4203(02)00070-1 2021-12-19T04:11:56Z International audience Published scavenging models generally assume that the 231Pa/230Th ratios of surface sediments are primarily determined by the mass flux of particles. In this study we compare the 230Th normalized vertical fluxes of both total sediments and opal to the 231Pa/230Th ratios measured from six sediment cores sampled across the Antarctic Circumpolar Current (ACC). We observe a better correlation between the 231Pa/230Th ratios and the vertical opal fluxes corrected for dissolution than with total sediment vertical fluxes. This observation indicates that opal may explain the enhanced scavenging of 231Pa. This result is consistent with the studies of Loeff and Berger [Deep-Sea Res. 40 (2) (1993) 339], Kumar et al. [Nature 378 (1995) 675] and Walter et al. [Earth Planet. Sci. Lett. 149 (1997) 85] who speculated that opal may explain enhanced scavenging of 231Pa. Finally, our results suggest that the 231Pa/230Th ratio is a reliable indicator of opal mass flux and can be used, taking some precautions, as a proxy for opal paleoproductivity in the Indian sector of the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Southern Ocean The Antarctic Indian Marine Chemistry 81 3-4 105 117 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Opal flux Southern Ocean 231Pa/230Th ratio [CHIM.ANAL]Chemical Sciences/Analytical chemistry |
spellingShingle |
Opal flux Southern Ocean 231Pa/230Th ratio [CHIM.ANAL]Chemical Sciences/Analytical chemistry Dezileau, L. Bareille, Gilles Reyss, J.L. The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean |
topic_facet |
Opal flux Southern Ocean 231Pa/230Th ratio [CHIM.ANAL]Chemical Sciences/Analytical chemistry |
description |
International audience Published scavenging models generally assume that the 231Pa/230Th ratios of surface sediments are primarily determined by the mass flux of particles. In this study we compare the 230Th normalized vertical fluxes of both total sediments and opal to the 231Pa/230Th ratios measured from six sediment cores sampled across the Antarctic Circumpolar Current (ACC). We observe a better correlation between the 231Pa/230Th ratios and the vertical opal fluxes corrected for dissolution than with total sediment vertical fluxes. This observation indicates that opal may explain the enhanced scavenging of 231Pa. This result is consistent with the studies of Loeff and Berger [Deep-Sea Res. 40 (2) (1993) 339], Kumar et al. [Nature 378 (1995) 675] and Walter et al. [Earth Planet. Sci. Lett. 149 (1997) 85] who speculated that opal may explain enhanced scavenging of 231Pa. Finally, our results suggest that the 231Pa/230Th ratio is a reliable indicator of opal mass flux and can be used, taking some precautions, as a proxy for opal paleoproductivity in the Indian sector of the Southern Ocean. |
author2 |
Universidad de Concepción - University of Concepcion Chile Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE) Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) 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) Océan et Interfaces (OCEANIS) 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) |
format |
Article in Journal/Newspaper |
author |
Dezileau, L. Bareille, Gilles Reyss, J.L. |
author_facet |
Dezileau, L. Bareille, Gilles Reyss, J.L. |
author_sort |
Dezileau, L. |
title |
The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean |
title_short |
The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean |
title_full |
The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean |
title_fullStr |
The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean |
title_full_unstemmed |
The 231Pa/230Th ratio as a proxy for past changes in opal fluxes in the Indian sector of the Southern Ocean |
title_sort |
231pa/230th ratio as a proxy for past changes in opal fluxes in the indian sector of the southern ocean |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.archives-ouvertes.fr/hal-00291368 https://doi.org/10.1016/S0304-4203(02)00070-1 |
geographic |
Antarctic Southern Ocean The Antarctic Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.archives-ouvertes.fr/hal-00291368 Marine Chemistry, Elsevier, 2003, 81 (03/04/08), pp.105-117. ⟨10.1016/S0304-4203(02)00070-1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0304-4203(02)00070-1 hal-00291368 https://hal.archives-ouvertes.fr/hal-00291368 doi:10.1016/S0304-4203(02)00070-1 |
op_doi |
https://doi.org/10.1016/S0304-4203(02)00070-1 |
container_title |
Marine Chemistry |
container_volume |
81 |
container_issue |
3-4 |
container_start_page |
105 |
op_container_end_page |
117 |
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1766025237698183168 |