Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada
International audience Atmospheric input of anthropogenic lead increased globally over the last centuries. The present study shows that the concentrations of lead in sediment cores from low-productivity Hudson Bay, northern Canada, remained relatively constant over the last centuries. The lack of im...
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Online Access: | https://hal.science/hal-02069843 https://hal.science/hal-02069843/document https://hal.science/hal-02069843/file/content.pdf https://doi.org/10.1007/s10533-017-0395-9 |
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ftinsu:oai:HAL:hal-02069843v1 2024-02-11T10:04:35+01:00 Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada Thibodeau, Benoit Migon, Christophe Dufour, Aurélie Poirier, André Mari, Xavier Ghaleb, Bassam Legendre, Louis The University of Hong Kong (HKU) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université du Québec à Montréal = University of Québec in Montréal (UQAM) Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) Ecologie des systèmes marins côtiers (Ecosym) Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS) 2017 https://hal.science/hal-02069843 https://hal.science/hal-02069843/document https://hal.science/hal-02069843/file/content.pdf https://doi.org/10.1007/s10533-017-0395-9 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s10533-017-0395-9 hal-02069843 https://hal.science/hal-02069843 https://hal.science/hal-02069843/document https://hal.science/hal-02069843/file/content.pdf doi:10.1007/s10533-017-0395-9 info:eu-repo/semantics/OpenAccess ISSN: 0168-2563 EISSN: 1573-515X Biogeochemistry https://hal.science/hal-02069843 Biogeochemistry, 2017, 136 (3), pp.279-291. ⟨10.1007/s10533-017-0395-9⟩ particulate matter oligotrophy ocean climate change carbon budget Vertical transfer [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.1007/s10533-017-0395-9 2024-01-24T17:31:53Z International audience Atmospheric input of anthropogenic lead increased globally over the last centuries. The present study shows that the concentrations of lead in sediment cores from low-productivity Hudson Bay, northern Canada, remained relatively constant over the last centuries. The lack of imprint of the increased anthropogenic lead input in this marine environment is not consistent with the increased lead concentrations in nearby lakes over the same period. In addition, the observed trend in lead isotopic composition in our cores suggests an apparent progressive overprint of anthropogenic lead during the 1900's. In other words, isotopes clearly registered the increasingly anthropogenic nature of lead in the sedimentary record, but total lead concentrations remained constant, indicating that some process limited the export of lead to the sediment. These observations point to a long-term limitation of the downward export of particles in Hudson Bay. Given that the source of lead was the same for both Hudson Bay and neighboring highproductivity lakes, we hypothesize that the very low primary productivity of Hudson Bay waters was responsible for the low vertical export of lead to marine sediments. We further propose that primary productivity is the most important factor that generally drives the vertical export of particulate matter, and thus hydrophobic contaminants, in near-oligotrophic marine environments. Article in Journal/Newspaper Hudson Bay Institut national des sciences de l'Univers: HAL-INSU Canada Hudson Hudson Bay Biogeochemistry 136 3 279 291 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
particulate matter oligotrophy ocean climate change carbon budget Vertical transfer [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
particulate matter oligotrophy ocean climate change carbon budget Vertical transfer [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Thibodeau, Benoit Migon, Christophe Dufour, Aurélie Poirier, André Mari, Xavier Ghaleb, Bassam Legendre, Louis Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada |
topic_facet |
particulate matter oligotrophy ocean climate change carbon budget Vertical transfer [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Atmospheric input of anthropogenic lead increased globally over the last centuries. The present study shows that the concentrations of lead in sediment cores from low-productivity Hudson Bay, northern Canada, remained relatively constant over the last centuries. The lack of imprint of the increased anthropogenic lead input in this marine environment is not consistent with the increased lead concentrations in nearby lakes over the same period. In addition, the observed trend in lead isotopic composition in our cores suggests an apparent progressive overprint of anthropogenic lead during the 1900's. In other words, isotopes clearly registered the increasingly anthropogenic nature of lead in the sedimentary record, but total lead concentrations remained constant, indicating that some process limited the export of lead to the sediment. These observations point to a long-term limitation of the downward export of particles in Hudson Bay. Given that the source of lead was the same for both Hudson Bay and neighboring highproductivity lakes, we hypothesize that the very low primary productivity of Hudson Bay waters was responsible for the low vertical export of lead to marine sediments. We further propose that primary productivity is the most important factor that generally drives the vertical export of particulate matter, and thus hydrophobic contaminants, in near-oligotrophic marine environments. |
author2 |
The University of Hong Kong (HKU) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université du Québec à Montréal = University of Québec in Montréal (UQAM) Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) Ecologie des systèmes marins côtiers (Ecosym) Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Thibodeau, Benoit Migon, Christophe Dufour, Aurélie Poirier, André Mari, Xavier Ghaleb, Bassam Legendre, Louis |
author_facet |
Thibodeau, Benoit Migon, Christophe Dufour, Aurélie Poirier, André Mari, Xavier Ghaleb, Bassam Legendre, Louis |
author_sort |
Thibodeau, Benoit |
title |
Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada |
title_short |
Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada |
title_full |
Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada |
title_fullStr |
Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada |
title_full_unstemmed |
Low sedimentary accumulation of lead caused by weak downward export of organic matter in Hudson Bay, northern Canada |
title_sort |
low sedimentary accumulation of lead caused by weak downward export of organic matter in hudson bay, northern canada |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-02069843 https://hal.science/hal-02069843/document https://hal.science/hal-02069843/file/content.pdf https://doi.org/10.1007/s10533-017-0395-9 |
geographic |
Canada Hudson Hudson Bay |
geographic_facet |
Canada Hudson Hudson Bay |
genre |
Hudson Bay |
genre_facet |
Hudson Bay |
op_source |
ISSN: 0168-2563 EISSN: 1573-515X Biogeochemistry https://hal.science/hal-02069843 Biogeochemistry, 2017, 136 (3), pp.279-291. ⟨10.1007/s10533-017-0395-9⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10533-017-0395-9 hal-02069843 https://hal.science/hal-02069843 https://hal.science/hal-02069843/document https://hal.science/hal-02069843/file/content.pdf doi:10.1007/s10533-017-0395-9 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s10533-017-0395-9 |
container_title |
Biogeochemistry |
container_volume |
136 |
container_issue |
3 |
container_start_page |
279 |
op_container_end_page |
291 |
_version_ |
1790601255963328512 |