Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf?
This study provides dissolved and particulate 230Th and 232Th results as well as particulate 234Th data collected during expeditions to the central Arctic Ocean (GEOTRACES, an international project to identify processes and quantify fluxes that control the distributions of trace elements; sections G...
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Language: | English |
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00050696 2023-05-15T13:22:39+02:00 Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf? Valk, Ole Rutgers van der Loeff, Michiel M. Geibert, Walter Gdaniec, Sandra Moran, S. Bradley Lepore, Kate Edwards, Robert Lawrence Lu, Yanbin Puigcorbé, Viena Casacuberta, Nuria Paffrath, Ronja Smethie, William Roy-Barman, Matthieu 2020-02 electronic https://doi.org/10.5194/os-16-221-2020 https://noa.gwlb.de/receive/cop_mods_00050696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050354/os-16-221-2020.pdf https://os.copernicus.org/articles/16/221/2020/os-16-221-2020.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-221-2020 https://noa.gwlb.de/receive/cop_mods_00050696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050354/os-16-221-2020.pdf https://os.copernicus.org/articles/16/221/2020/os-16-221-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/os-16-221-2020 2022-02-08T22:36:45Z This study provides dissolved and particulate 230Th and 232Th results as well as particulate 234Th data collected during expeditions to the central Arctic Ocean (GEOTRACES, an international project to identify processes and quantify fluxes that control the distributions of trace elements; sections GN04 and GIPY11). Constructing a time series of dissolved 230Th from 1991 to 2015 enables the identification of processes that control the temporal development of 230Th distributions in the Amundsen Basin. After 2007, 230Th concentrations decreased significantly over the entire water column, particularly between 300 and 1500 m. This decrease is accompanied by a circulation change, evidenced by a concomitant increase in salinity. A potentially increased inflow of water of Atlantic origin with low dissolved 230Th concentrations leads to the observed depletion in dissolved 230Th in the central Arctic. Because atmospherically derived tracers (chlorofluorocarbon (CFC), sulfur hexafluoride (SF6)) do not reveal an increase in ventilation rate, it is suggested that these interior waters have undergone enhanced scavenging of Th during transit from Fram Strait and the Barents Sea to the central Amundsen Basin. The 230Th depletion propagates downward in the water column by settling particles and reversible scavenging. Article in Journal/Newspaper amundsen basin Arctic Arctic Ocean Barents Sea Fram Strait Niedersächsisches Online-Archiv NOA Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Arctic Ocean Barents Sea Ocean Science 16 1 221 234 |
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Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Valk, Ole Rutgers van der Loeff, Michiel M. Geibert, Walter Gdaniec, Sandra Moran, S. Bradley Lepore, Kate Edwards, Robert Lawrence Lu, Yanbin Puigcorbé, Viena Casacuberta, Nuria Paffrath, Ronja Smethie, William Roy-Barman, Matthieu Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf? |
topic_facet |
article Verlagsveröffentlichung |
description |
This study provides dissolved and particulate 230Th and 232Th results as well as particulate 234Th data collected during expeditions to the central Arctic Ocean (GEOTRACES, an international project to identify processes and quantify fluxes that control the distributions of trace elements; sections GN04 and GIPY11). Constructing a time series of dissolved 230Th from 1991 to 2015 enables the identification of processes that control the temporal development of 230Th distributions in the Amundsen Basin. After 2007, 230Th concentrations decreased significantly over the entire water column, particularly between 300 and 1500 m. This decrease is accompanied by a circulation change, evidenced by a concomitant increase in salinity. A potentially increased inflow of water of Atlantic origin with low dissolved 230Th concentrations leads to the observed depletion in dissolved 230Th in the central Arctic. Because atmospherically derived tracers (chlorofluorocarbon (CFC), sulfur hexafluoride (SF6)) do not reveal an increase in ventilation rate, it is suggested that these interior waters have undergone enhanced scavenging of Th during transit from Fram Strait and the Barents Sea to the central Amundsen Basin. The 230Th depletion propagates downward in the water column by settling particles and reversible scavenging. |
format |
Article in Journal/Newspaper |
author |
Valk, Ole Rutgers van der Loeff, Michiel M. Geibert, Walter Gdaniec, Sandra Moran, S. Bradley Lepore, Kate Edwards, Robert Lawrence Lu, Yanbin Puigcorbé, Viena Casacuberta, Nuria Paffrath, Ronja Smethie, William Roy-Barman, Matthieu |
author_facet |
Valk, Ole Rutgers van der Loeff, Michiel M. Geibert, Walter Gdaniec, Sandra Moran, S. Bradley Lepore, Kate Edwards, Robert Lawrence Lu, Yanbin Puigcorbé, Viena Casacuberta, Nuria Paffrath, Ronja Smethie, William Roy-Barman, Matthieu |
author_sort |
Valk, Ole |
title |
Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf? |
title_short |
Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf? |
title_full |
Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf? |
title_fullStr |
Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf? |
title_full_unstemmed |
Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf? |
title_sort |
decrease in 230th in the amundsen basin since 2007: far-field effect of increased scavenging on the shelf? |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/os-16-221-2020 https://noa.gwlb.de/receive/cop_mods_00050696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050354/os-16-221-2020.pdf https://os.copernicus.org/articles/16/221/2020/os-16-221-2020.pdf |
long_lat |
ENVELOPE(74.000,74.000,87.000,87.000) |
geographic |
Amundsen Basin Arctic Arctic Ocean Barents Sea |
geographic_facet |
Amundsen Basin Arctic Arctic Ocean Barents Sea |
genre |
amundsen basin Arctic Arctic Ocean Barents Sea Fram Strait |
genre_facet |
amundsen basin Arctic Arctic Ocean Barents Sea Fram Strait |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-221-2020 https://noa.gwlb.de/receive/cop_mods_00050696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050354/os-16-221-2020.pdf https://os.copernicus.org/articles/16/221/2020/os-16-221-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/os-16-221-2020 |
container_title |
Ocean Science |
container_volume |
16 |
container_issue |
1 |
container_start_page |
221 |
op_container_end_page |
234 |
_version_ |
1766365885746905088 |