Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria
International audience High mercury (Hg) levels have been observed for arctic biota despite limited localsources of anthropogenic Hg in the Arctic. Scavenging of Hg exerts an important control onthe residence time of Hg in surface waters. The downward Hg export flux, as well as Hgburial rates in bot...
Published in: | ACS Earth and Space Chemistry |
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Main Authors: | , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.science/hal-02935259 https://hal.science/hal-02935259/document https://hal.science/hal-02935259/file/Final_version_exported_from_the_PhD.pdf https://doi.org/10.1021/acsearthspacechem.0c00055 |
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Aix-Marseille Université: HAL |
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language |
English |
topic |
GEOTRACES particulate mercury Arctic Ocean thorium export particle export flux [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
GEOTRACES particulate mercury Arctic Ocean thorium export particle export flux [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Tesán Onrubia, Javier Petrova, Mariia Puigcorbé, Viena Black, Erin Valk, Ole Dufour, Aurélie Hamelin, Bruno Buesseler, Ken Masqué, Pere Le Moigne, Frédéric A.C. Sonke, Jeroen Rutgers van Der Loeff, Michiel Heimbürger-Boavida, Lars-Eric Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria |
topic_facet |
GEOTRACES particulate mercury Arctic Ocean thorium export particle export flux [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience High mercury (Hg) levels have been observed for arctic biota despite limited localsources of anthropogenic Hg in the Arctic. Scavenging of Hg exerts an important control onthe residence time of Hg in surface waters. The downward Hg export flux, as well as Hgburial rates in bottom sediments, are not well constrained due to the lack of particulate Hg(pHg) observations in the Arctic Ocean. Here we estimated downward Hg export flux basedon Hg concentrations in suspended particulate matter (SPM) and by using the radionuclidepair 234Th/238U, coupled to pHg/234Th ratios in particles. Using new observations made duringthe German GEOTRACES TransArcII (GN04) and the U.S. Arctic GEOTRACES (GN01)cruises in August - October 2015, we estimated the pHg export flux in the central ArcticOcean and the outer shelf. We find that 81 ± 58 Mg y-1 pHg are exported from the upper 100m, of which 16 ± 10 Mg y-1 are ultimately buried in marine sediments. An extrapolation tothe entire Arctic Ocean, including the inner shelf, results in 156 Mg y-1 pHg export from thesurface ocean and 28 Mg y-1 Hg burial rate. Our study shows that the pHg export flux couldbe higher than previously thought and this should be taken into consideration for future arcticHg budget estimations. |
author2 |
Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Partenaires INRAE Dalhousie University Halifax Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Woods Hole Oceanographic Institution (WHOI) School of Natural Sciences and Centre for Marine Ecosystems Research Edith Cowan University EDITH COWAN UNIVERSITY-EDITH COWAN UNIVERSITY 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 |
Tesán Onrubia, Javier Petrova, Mariia Puigcorbé, Viena Black, Erin Valk, Ole Dufour, Aurélie Hamelin, Bruno Buesseler, Ken Masqué, Pere Le Moigne, Frédéric A.C. Sonke, Jeroen Rutgers van Der Loeff, Michiel Heimbürger-Boavida, Lars-Eric |
author_facet |
Tesán Onrubia, Javier Petrova, Mariia Puigcorbé, Viena Black, Erin Valk, Ole Dufour, Aurélie Hamelin, Bruno Buesseler, Ken Masqué, Pere Le Moigne, Frédéric A.C. Sonke, Jeroen Rutgers van Der Loeff, Michiel Heimbürger-Boavida, Lars-Eric |
author_sort |
Tesán Onrubia, Javier |
title |
Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria |
title_short |
Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria |
title_full |
Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria |
title_fullStr |
Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria |
title_full_unstemmed |
Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria |
title_sort |
mercury export flux in the arctic ocean estimated from 234 th/ 238 u disequilibria |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02935259 https://hal.science/hal-02935259/document https://hal.science/hal-02935259/file/Final_version_exported_from_the_PhD.pdf https://doi.org/10.1021/acsearthspacechem.0c00055 |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
ISSN: 2472-3452 ACS Earth and Space Chemistry https://hal.science/hal-02935259 ACS Earth and Space Chemistry, 2020, 4 (5), pp.795-801. ⟨10.1021/acsearthspacechem.0c00055⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1021/acsearthspacechem.0c00055 hal-02935259 https://hal.science/hal-02935259 https://hal.science/hal-02935259/document https://hal.science/hal-02935259/file/Final_version_exported_from_the_PhD.pdf doi:10.1021/acsearthspacechem.0c00055 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1021/acsearthspacechem.0c00055 |
container_title |
ACS Earth and Space Chemistry |
container_volume |
4 |
container_issue |
5 |
container_start_page |
795 |
op_container_end_page |
801 |
_version_ |
1797575795429867520 |
spelling |
ftunivaixmarseil:oai:HAL:hal-02935259v1 2024-04-28T08:06:09+00:00 Mercury Export Flux in the Arctic Ocean Estimated from 234 Th/ 238 U Disequilibria Tesán Onrubia, Javier Petrova, Mariia Puigcorbé, Viena Black, Erin Valk, Ole Dufour, Aurélie Hamelin, Bruno Buesseler, Ken Masqué, Pere Le Moigne, Frédéric A.C. Sonke, Jeroen Rutgers van Der Loeff, Michiel Heimbürger-Boavida, Lars-Eric Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Partenaires INRAE Dalhousie University Halifax Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Woods Hole Oceanographic Institution (WHOI) School of Natural Sciences and Centre for Marine Ecosystems Research Edith Cowan University EDITH COWAN UNIVERSITY-EDITH COWAN UNIVERSITY 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) 2020-05-21 https://hal.science/hal-02935259 https://hal.science/hal-02935259/document https://hal.science/hal-02935259/file/Final_version_exported_from_the_PhD.pdf https://doi.org/10.1021/acsearthspacechem.0c00055 en eng HAL CCSD ACS info:eu-repo/semantics/altIdentifier/doi/10.1021/acsearthspacechem.0c00055 hal-02935259 https://hal.science/hal-02935259 https://hal.science/hal-02935259/document https://hal.science/hal-02935259/file/Final_version_exported_from_the_PhD.pdf doi:10.1021/acsearthspacechem.0c00055 info:eu-repo/semantics/OpenAccess ISSN: 2472-3452 ACS Earth and Space Chemistry https://hal.science/hal-02935259 ACS Earth and Space Chemistry, 2020, 4 (5), pp.795-801. ⟨10.1021/acsearthspacechem.0c00055⟩ GEOTRACES particulate mercury Arctic Ocean thorium export particle export flux [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2020 ftunivaixmarseil https://doi.org/10.1021/acsearthspacechem.0c00055 2024-04-11T00:27:00Z International audience High mercury (Hg) levels have been observed for arctic biota despite limited localsources of anthropogenic Hg in the Arctic. Scavenging of Hg exerts an important control onthe residence time of Hg in surface waters. The downward Hg export flux, as well as Hgburial rates in bottom sediments, are not well constrained due to the lack of particulate Hg(pHg) observations in the Arctic Ocean. Here we estimated downward Hg export flux basedon Hg concentrations in suspended particulate matter (SPM) and by using the radionuclidepair 234Th/238U, coupled to pHg/234Th ratios in particles. Using new observations made duringthe German GEOTRACES TransArcII (GN04) and the U.S. Arctic GEOTRACES (GN01)cruises in August - October 2015, we estimated the pHg export flux in the central ArcticOcean and the outer shelf. We find that 81 ± 58 Mg y-1 pHg are exported from the upper 100m, of which 16 ± 10 Mg y-1 are ultimately buried in marine sediments. An extrapolation tothe entire Arctic Ocean, including the inner shelf, results in 156 Mg y-1 pHg export from thesurface ocean and 28 Mg y-1 Hg burial rate. Our study shows that the pHg export flux couldbe higher than previously thought and this should be taken into consideration for future arcticHg budget estimations. Article in Journal/Newspaper Arctic Arctic Ocean Aix-Marseille Université: HAL ACS Earth and Space Chemistry 4 5 795 801 |