Fractionation of 226Ra and Ba in the Upper North Pacific Ocean

International audience Investigations conducted during the GEOSECS program concluded that radium-226 (T 1/2 = 1602 y) and barium are tightly correlated in waters above 2500 m in the Atlantic, Pacific and Antarctic Oceans, with a fairly uniform 226 Ra/Ba ratio of 2.3 ± 0.2 dpm µmol -1 (4.6 nmol 226 R...

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Published in:Frontiers in Marine Science
Main Authors: van Beek, Pieter, François, Roger, Honda, Makio, Charette, Matthew, A, Reyss, Jean-Louis, Ganeshram, Raja, Monnin, Christophe, Honjo, Susumu
Other Authors: 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), Océan et Interfaces (OCEANIS), 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)), Géosciences Environnement Toulouse (GET), 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)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2022
Subjects:
Online Access:https://hal.science/hal-03747246
https://hal.science/hal-03747246/document
https://hal.science/hal-03747246/file/fmars-09-859117.pdf
https://doi.org/10.3389/fmars.2022.859117
id ftuniversailles:oai:HAL:hal-03747246v1
record_format openpolar
institution Open Polar
collection Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
op_collection_id ftuniversailles
language English
topic radium
barium
seawater
ratio
fractionation
dating
ocean circulation
suspended particles
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
spellingShingle radium
barium
seawater
ratio
fractionation
dating
ocean circulation
suspended particles
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
van Beek, Pieter
François, Roger
Honda, Makio
Charette, Matthew, A
Reyss, Jean-Louis
Ganeshram, Raja
Monnin, Christophe
Honjo, Susumu
Fractionation of 226Ra and Ba in the Upper North Pacific Ocean
topic_facet radium
barium
seawater
ratio
fractionation
dating
ocean circulation
suspended particles
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
description International audience Investigations conducted during the GEOSECS program concluded that radium-226 (T 1/2 = 1602 y) and barium are tightly correlated in waters above 2500 m in the Atlantic, Pacific and Antarctic Oceans, with a fairly uniform 226 Ra/Ba ratio of 2.3 ± 0.2 dpm µmol -1 (4.6 nmol 226 Ra/mol Ba). Here, we report new 226 Ra and Ba data obtained at three different stations in the Pacific Ocean: stations K1 and K3 in the North-West Pacific and station old Hale Aloha, off Hawaii Island. The relationship between 226 Ra and Ba found at these stations is broadly consistent with that reported during the GEOSECS program. At the three investigated stations, however, we find that the 226 Ra/Ba ratios are significantly lower in the upper 500 m of the water column than at greater depths, a pattern that was overlooked during the GEOSECS program, either because of the precision of the measurements or because of the relatively low sampling resolution in the upper 500 m. Although not always apparent in individual GEOSECS profiles, this trend was noted before from the non-zero intercept of the linear regression when plotting the global data set of Ba versus 226 Ra seawater concentration and was attributed, at least in part, to the predominance of surface input from rivers for Ba versus bottom input from sediments for 226 Ra. Similarly, low 226 Ra/Ba ratios in the upper 500 m have been reported in other oceanic basins (e.g. Atlantic Ocean). Parallel to the low 226 Ra/Ba ratios in seawater, higher 226 Ra/Ba ratios were found in suspended particles collected in the upper 500 m. This suggests that fractionation between the two elements may contribute to the lower 226 Ra/Ba ratios found in the upper 500 m, with 226 Ra being preferentially removed from surface water, possibly as a result of mass fractionation during celestite formation by acantharians and/or barite precipitation, since both chemical elements have similar ionic radius and the same configuration of valence electrons. This finding has implications for ...
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)
Océan et Interfaces (OCEANIS)
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))
Géosciences Environnement Toulouse (GET)
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)
format Article in Journal/Newspaper
author van Beek, Pieter
François, Roger
Honda, Makio
Charette, Matthew, A
Reyss, Jean-Louis
Ganeshram, Raja
Monnin, Christophe
Honjo, Susumu
author_facet van Beek, Pieter
François, Roger
Honda, Makio
Charette, Matthew, A
Reyss, Jean-Louis
Ganeshram, Raja
Monnin, Christophe
Honjo, Susumu
author_sort van Beek, Pieter
title Fractionation of 226Ra and Ba in the Upper North Pacific Ocean
title_short Fractionation of 226Ra and Ba in the Upper North Pacific Ocean
title_full Fractionation of 226Ra and Ba in the Upper North Pacific Ocean
title_fullStr Fractionation of 226Ra and Ba in the Upper North Pacific Ocean
title_full_unstemmed Fractionation of 226Ra and Ba in the Upper North Pacific Ocean
title_sort fractionation of 226ra and ba in the upper north pacific ocean
publisher HAL CCSD
publishDate 2022
url https://hal.science/hal-03747246
https://hal.science/hal-03747246/document
https://hal.science/hal-03747246/file/fmars-09-859117.pdf
https://doi.org/10.3389/fmars.2022.859117
long_lat ENVELOPE(-86.317,-86.317,-78.067,-78.067)
geographic Antarctic
Hale
Pacific
geographic_facet Antarctic
Hale
Pacific
genre Antarc*
Antarctic
genre_facet Antarc*
Antarctic
op_source ISSN: 2296-7745
Frontiers in Marine Science
https://hal.science/hal-03747246
Frontiers in Marine Science, 2022, 9, ⟨10.3389/fmars.2022.859117⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2022.859117
hal-03747246
https://hal.science/hal-03747246
https://hal.science/hal-03747246/document
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doi:10.3389/fmars.2022.859117
op_rights info:eu-repo/semantics/OpenAccess
op_doi https://doi.org/10.3389/fmars.2022.859117
container_title Frontiers in Marine Science
container_volume 9
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spelling ftuniversailles:oai:HAL:hal-03747246v1 2024-04-14T08:03:26+00:00 Fractionation of 226Ra and Ba in the Upper North Pacific Ocean van Beek, Pieter François, Roger Honda, Makio Charette, Matthew, A Reyss, Jean-Louis Ganeshram, Raja Monnin, Christophe Honjo, Susumu 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) Océan et Interfaces (OCEANIS) 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)) Géosciences Environnement Toulouse (GET) 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) 2022-07-15 https://hal.science/hal-03747246 https://hal.science/hal-03747246/document https://hal.science/hal-03747246/file/fmars-09-859117.pdf https://doi.org/10.3389/fmars.2022.859117 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2022.859117 hal-03747246 https://hal.science/hal-03747246 https://hal.science/hal-03747246/document https://hal.science/hal-03747246/file/fmars-09-859117.pdf doi:10.3389/fmars.2022.859117 info:eu-repo/semantics/OpenAccess ISSN: 2296-7745 Frontiers in Marine Science https://hal.science/hal-03747246 Frontiers in Marine Science, 2022, 9, ⟨10.3389/fmars.2022.859117⟩ radium barium seawater ratio fractionation dating ocean circulation suspended particles [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2022 ftuniversailles https://doi.org/10.3389/fmars.2022.859117 2024-03-21T16:13:14Z International audience Investigations conducted during the GEOSECS program concluded that radium-226 (T 1/2 = 1602 y) and barium are tightly correlated in waters above 2500 m in the Atlantic, Pacific and Antarctic Oceans, with a fairly uniform 226 Ra/Ba ratio of 2.3 ± 0.2 dpm µmol -1 (4.6 nmol 226 Ra/mol Ba). Here, we report new 226 Ra and Ba data obtained at three different stations in the Pacific Ocean: stations K1 and K3 in the North-West Pacific and station old Hale Aloha, off Hawaii Island. The relationship between 226 Ra and Ba found at these stations is broadly consistent with that reported during the GEOSECS program. At the three investigated stations, however, we find that the 226 Ra/Ba ratios are significantly lower in the upper 500 m of the water column than at greater depths, a pattern that was overlooked during the GEOSECS program, either because of the precision of the measurements or because of the relatively low sampling resolution in the upper 500 m. Although not always apparent in individual GEOSECS profiles, this trend was noted before from the non-zero intercept of the linear regression when plotting the global data set of Ba versus 226 Ra seawater concentration and was attributed, at least in part, to the predominance of surface input from rivers for Ba versus bottom input from sediments for 226 Ra. Similarly, low 226 Ra/Ba ratios in the upper 500 m have been reported in other oceanic basins (e.g. Atlantic Ocean). Parallel to the low 226 Ra/Ba ratios in seawater, higher 226 Ra/Ba ratios were found in suspended particles collected in the upper 500 m. This suggests that fractionation between the two elements may contribute to the lower 226 Ra/Ba ratios found in the upper 500 m, with 226 Ra being preferentially removed from surface water, possibly as a result of mass fractionation during celestite formation by acantharians and/or barite precipitation, since both chemical elements have similar ionic radius and the same configuration of valence electrons. This finding has implications for ... Article in Journal/Newspaper Antarc* Antarctic Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Antarctic Hale ENVELOPE(-86.317,-86.317,-78.067,-78.067) Pacific Frontiers in Marine Science 9