Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers
International audience Since the 1980-1990s, international research efforts have augmented our knowledge of the physical and chemical properties of the Arctic Ocean water masses, and recent studies have documented changes. Understanding the processes responsible for these changes is necessary to be...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , , , , , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.science/hal-03805804 https://hal.science/hal-03805804/document https://hal.science/hal-03805804/file/Grenier-etal_230Th-231Pa-eNd_Arctic-AmerasianBasin_JGR_19.pdf https://doi.org/10.1029/2019JC015265 |
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Open Polar |
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Météo-France: HAL |
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ftmeteofrance |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Grenier, Mélanie François, Roger Soon, Maureen Rutgers van der Loeff, Michiel Yu, Xiaoxin Valk, Ole Not, Christelle Moran, S. Bradley Edwards, R. Lawrence Lu, Yanbin Lepore, Kate Allen, Susan Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Since the 1980-1990s, international research efforts have augmented our knowledge of the physical and chemical properties of the Arctic Ocean water masses, and recent studies have documented changes. Understanding the processes responsible for these changes is necessary to be able to forecast the local and global consequences of these property evolutions on climate. The present work investigates the distributions of geochemical tracers of particle fluxes and circulation in the Amerasian Basin and their temporal evolution over the last three decades (from stations visited between 1983 and 2015). Profiles of 230-thorium (230 Th) and 231-protactinium (231 Pa) concentrations and neodymium isotopes (expressed as ε Nd) measured in the Amerasian Basin prior to 2000 are compared to a new, post-2000s data set. The comparison shows a large scale decrease in dissolved 230 Th and 231 Pa concentrations, suggesting intensification of scavenging by particle flux, especially in coastal areas. Higher productivity and sediment resuspension from the shelves appear responsible for the concentration decrease along the margins. In the basin interior, increased lateral exchanges with the boundary circulation also contribute to the decrease in concentration. This study illustrates how dissolved 230 Th and 231 Pa, with ε Nd support, can provide unique insights not only into changes in particle flux but also into the evolution of ocean circulation and mixing. Plain Language Summary The Arctic Ocean is one of the oceanic regions most affected by climate change. The increasing summer retreat of sea ice allows greater atmosphere-ocean exchanges and light penetration, while land-ocean exchanges are expected to increase, due to enhanced continental erosion (notably through permafrost thawing and increased river flow). These changes are driven by climate and in turn impact the climate. This study aims at assessing possible shifts in oceanic circulation and particle fluxes resulting from these climate-driven changes in ... |
author2 |
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) University of British Columbia (UBC) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association University of Minnesota Twin Cities (UMN) University of Minnesota System (UMN) |
format |
Article in Journal/Newspaper |
author |
Grenier, Mélanie François, Roger Soon, Maureen Rutgers van der Loeff, Michiel Yu, Xiaoxin Valk, Ole Not, Christelle Moran, S. Bradley Edwards, R. Lawrence Lu, Yanbin Lepore, Kate Allen, Susan |
author_facet |
Grenier, Mélanie François, Roger Soon, Maureen Rutgers van der Loeff, Michiel Yu, Xiaoxin Valk, Ole Not, Christelle Moran, S. Bradley Edwards, R. Lawrence Lu, Yanbin Lepore, Kate Allen, Susan |
author_sort |
Grenier, Mélanie |
title |
Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers |
title_short |
Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers |
title_full |
Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers |
title_fullStr |
Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers |
title_full_unstemmed |
Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers |
title_sort |
changes in circulation and particle scavenging in the amerasian basin of the arctic ocean over the last three decades inferred from the water column distribution of geochemical tracers |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-03805804 https://hal.science/hal-03805804/document https://hal.science/hal-03805804/file/Grenier-etal_230Th-231Pa-eNd_Arctic-AmerasianBasin_JGR_19.pdf https://doi.org/10.1029/2019JC015265 |
genre |
Arctic Ocean Climate change Ice permafrost Sea ice |
genre_facet |
Arctic Ocean Climate change Ice permafrost Sea ice |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03805804 Journal of Geophysical Research. Oceans, 2019, 124 (12), pp.9338-9363. ⟨10.1029/2019JC015265⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015265 hal-03805804 https://hal.science/hal-03805804 https://hal.science/hal-03805804/document https://hal.science/hal-03805804/file/Grenier-etal_230Th-231Pa-eNd_Arctic-AmerasianBasin_JGR_19.pdf doi:10.1029/2019JC015265 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019JC015265 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
12 |
container_start_page |
9338 |
op_container_end_page |
9363 |
_version_ |
1810295556497473536 |
spelling |
ftmeteofrance:oai:HAL:hal-03805804v1 2024-09-15T17:53:27+00:00 Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers Grenier, Mélanie François, Roger Soon, Maureen Rutgers van der Loeff, Michiel Yu, Xiaoxin Valk, Ole Not, Christelle Moran, S. Bradley Edwards, R. Lawrence Lu, Yanbin Lepore, Kate Allen, Susan 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) University of British Columbia (UBC) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association University of Minnesota Twin Cities (UMN) University of Minnesota System (UMN) 2019 https://hal.science/hal-03805804 https://hal.science/hal-03805804/document https://hal.science/hal-03805804/file/Grenier-etal_230Th-231Pa-eNd_Arctic-AmerasianBasin_JGR_19.pdf https://doi.org/10.1029/2019JC015265 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015265 hal-03805804 https://hal.science/hal-03805804 https://hal.science/hal-03805804/document https://hal.science/hal-03805804/file/Grenier-etal_230Th-231Pa-eNd_Arctic-AmerasianBasin_JGR_19.pdf doi:10.1029/2019JC015265 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03805804 Journal of Geophysical Research. Oceans, 2019, 124 (12), pp.9338-9363. ⟨10.1029/2019JC015265⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2019 ftmeteofrance https://doi.org/10.1029/2019JC015265 2024-06-25T00:08:36Z International audience Since the 1980-1990s, international research efforts have augmented our knowledge of the physical and chemical properties of the Arctic Ocean water masses, and recent studies have documented changes. Understanding the processes responsible for these changes is necessary to be able to forecast the local and global consequences of these property evolutions on climate. The present work investigates the distributions of geochemical tracers of particle fluxes and circulation in the Amerasian Basin and their temporal evolution over the last three decades (from stations visited between 1983 and 2015). Profiles of 230-thorium (230 Th) and 231-protactinium (231 Pa) concentrations and neodymium isotopes (expressed as ε Nd) measured in the Amerasian Basin prior to 2000 are compared to a new, post-2000s data set. The comparison shows a large scale decrease in dissolved 230 Th and 231 Pa concentrations, suggesting intensification of scavenging by particle flux, especially in coastal areas. Higher productivity and sediment resuspension from the shelves appear responsible for the concentration decrease along the margins. In the basin interior, increased lateral exchanges with the boundary circulation also contribute to the decrease in concentration. This study illustrates how dissolved 230 Th and 231 Pa, with ε Nd support, can provide unique insights not only into changes in particle flux but also into the evolution of ocean circulation and mixing. Plain Language Summary The Arctic Ocean is one of the oceanic regions most affected by climate change. The increasing summer retreat of sea ice allows greater atmosphere-ocean exchanges and light penetration, while land-ocean exchanges are expected to increase, due to enhanced continental erosion (notably through permafrost thawing and increased river flow). These changes are driven by climate and in turn impact the climate. This study aims at assessing possible shifts in oceanic circulation and particle fluxes resulting from these climate-driven changes in ... Article in Journal/Newspaper Arctic Ocean Climate change Ice permafrost Sea ice Météo-France: HAL Journal of Geophysical Research: Oceans 124 12 9338 9363 |