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
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 lo...
Published in: | Journal of Geophysical Research: Oceans |
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ftpubmed:oai:pubmedcentral.nih.gov:7006760 2023-05-15T14:59:24+02:00 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, Melanie 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 E. 2019-12-18 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7006760/ https://doi.org/10.1029/2019JC015265 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7006760/ http://dx.doi.org/10.1029/2019JC015265 ©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Research Articles Text 2019 ftpubmed https://doi.org/10.1029/2019JC015265 2020-02-16T01:31:19Z 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. Text Arctic Arctic Ocean PubMed Central (PMC) Arctic Arctic Ocean Journal of Geophysical Research: Oceans 124 12 9338 9363 |
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English |
topic |
Research Articles |
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Research Articles Grenier, Melanie 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 E. 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 |
Research Articles |
description |
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. |
format |
Text |
author |
Grenier, Melanie 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 E. |
author_facet |
Grenier, Melanie 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 E. |
author_sort |
Grenier, Melanie |
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 |
John Wiley and Sons Inc. |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7006760/ https://doi.org/10.1029/2019JC015265 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7006760/ http://dx.doi.org/10.1029/2019JC015265 |
op_rights |
©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
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 |
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1766331507421478912 |