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
Abstract Since the 1980s-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 forec...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2019
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/53830/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JC015265 https://hdl.handle.net/10013/epic.980eabfb-ff3c-4176-b839-9f506d45da2b |
id |
ftawi:oai:epic.awi.de:53830 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:53830 2023-05-15T14:27:58+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 https://epic.awi.de/id/eprint/53830/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JC015265 https://hdl.handle.net/10013/epic.980eabfb-ff3c-4176-b839-9f506d45da2b unknown Grenier, M. , François, R. , Soon, M. , Rutgers van der Loeff, M. orcid:0000-0003-1393-3742 , Yu, X. , Valk, O. orcid:0000-0003-1406-0701 , Not, C. , Moran, S. B. , Edwards, R. L. , Lu, Y. , Lepore, K. and Allen, S. E. (2019) 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 , Journal of Geophysical Research: Oceans, 124 (12), pp. 9338-9363 . doi:10.1029/2019JC015265 <https://doi.org/10.1029/2019JC015265> , hdl:10013/epic.980eabfb-ff3c-4176-b839-9f506d45da2b EPIC3Journal of Geophysical Research: Oceans, 124(12), pp. 9338-9363 Article isiRev 2019 ftawi https://doi.org/10.1029/2019JC015265 2021-12-24T15:46:13Z Abstract Since the 1980s-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 (230Th) and 231-protactinium (231Pa) concentrations and neodymium isotopes (expressed as εNd) 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 230Th and 231Pa 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 230Th and 231Pa, with εNd support, can provide unique insights not only into changes in particle flux but also into the evolution of ocean circulation and mixing. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Journal of Geophysical Research: Oceans 124 12 9338 9363 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Abstract Since the 1980s-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 (230Th) and 231-protactinium (231Pa) concentrations and neodymium isotopes (expressed as εNd) 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 230Th and 231Pa 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 230Th and 231Pa, with εNd support, can provide unique insights not only into changes in particle flux but also into the evolution of ocean circulation and mixing. |
format |
Article in Journal/Newspaper |
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. |
spellingShingle |
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 |
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 |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/53830/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JC015265 https://hdl.handle.net/10013/epic.980eabfb-ff3c-4176-b839-9f506d45da2b |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Arctic Ocean |
op_source |
EPIC3Journal of Geophysical Research: Oceans, 124(12), pp. 9338-9363 |
op_relation |
Grenier, M. , François, R. , Soon, M. , Rutgers van der Loeff, M. orcid:0000-0003-1393-3742 , Yu, X. , Valk, O. orcid:0000-0003-1406-0701 , Not, C. , Moran, S. B. , Edwards, R. L. , Lu, Y. , Lepore, K. and Allen, S. E. (2019) 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 , Journal of Geophysical Research: Oceans, 124 (12), pp. 9338-9363 . doi:10.1029/2019JC015265 <https://doi.org/10.1029/2019JC015265> , hdl:10013/epic.980eabfb-ff3c-4176-b839-9f506d45da2b |
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_ |
1766302069222801408 |