Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean
The natural radionuclides 231 Pa and 230 Th are incorporated into the marine sediment record by scavenging, or adsorption to various particle types, via chemical reactions that are not fully understood. Because these isotopes have potential value in tracing several oceanographic processes, we invest...
Published in: | Marine Chemistry |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2015
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ftubristolcris:oai:research-information.bris.ac.uk:publications/ecec92cd-7b88-43e5-aacf-95ac56c9dfcc 2024-01-28T10:07:42+01:00 Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean Hayes, Christopher T. Anderson, Robert F. Fleisher, Martin Q. Vivancos, Sebastian M. Lam, Phoebe J. Ohnemus, Daniel C. Huang, Kuo Fang Robinson, Laura F. Lu, Yanbin Cheng, Hai Edwards, R. Lawrence Moran, S. Bradley 2015-03-01 https://hdl.handle.net/1983/ecec92cd-7b88-43e5-aacf-95ac56c9dfcc https://research-information.bris.ac.uk/en/publications/ecec92cd-7b88-43e5-aacf-95ac56c9dfcc https://doi.org/10.1016/j.marchem.2015.01.006 http://www.scopus.com/inward/record.url?scp=84922782845&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Hayes , C T , Anderson , R F , Fleisher , M Q , Vivancos , S M , Lam , P J , Ohnemus , D C , Huang , K F , Robinson , L F , Lu , Y , Cheng , H , Edwards , R L & Moran , S B 2015 , ' Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean ' , Marine Chemistry , vol. 170 , pp. 49-60 . https://doi.org/10.1016/j.marchem.2015.01.006 Adsorption GEOTRACES Radioactive tracers Suspended particulate matter Trace elements article 2015 ftubristolcris https://doi.org/10.1016/j.marchem.2015.01.006 2024-01-04T23:44:04Z The natural radionuclides 231 Pa and 230 Th are incorporated into the marine sediment record by scavenging, or adsorption to various particle types, via chemical reactions that are not fully understood. Because these isotopes have potential value in tracing several oceanographic processes, we investigate the nature of scavenging using trans-Atlantic measurements of dissolved (<0.45μm) and particulate (0.8-51μm) 231 Pa and 230 Th, together with major particle composition. We find widespread impact of intense scavenging by authigenic Fe/Mn (hydr)oxides, in the form of hydrothermal particles emanating from the Mid-Atlantic ridge and particles resuspended from reducing conditions near the seafloor off the coast of West Africa. Biogenic opal was not found to be a significant scavenging phase for either element in this sample set, essentially because of its low abundance and small dynamic range at the studied sites. Distribution coefficients in shallow (<200m) depths are anomalously low which suggests either the unexpected result of a low scavenging intensity for organic matter or that, in water masses containing abundant organic-rich particles, a greater percentage of radionuclides exist in the colloidal or complexed phase. In addition to particle concentration, the oceanic distribution of particle types likely plays a significant role in the ultimate distribution of sedimentary 230 Th and 231 Pa. Article in Journal/Newspaper North Atlantic University of Bristol: Bristol Research Mid-Atlantic Ridge Marine Chemistry 170 49 60 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
Adsorption GEOTRACES Radioactive tracers Suspended particulate matter Trace elements |
spellingShingle |
Adsorption GEOTRACES Radioactive tracers Suspended particulate matter Trace elements Hayes, Christopher T. Anderson, Robert F. Fleisher, Martin Q. Vivancos, Sebastian M. Lam, Phoebe J. Ohnemus, Daniel C. Huang, Kuo Fang Robinson, Laura F. Lu, Yanbin Cheng, Hai Edwards, R. Lawrence Moran, S. Bradley Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean |
topic_facet |
Adsorption GEOTRACES Radioactive tracers Suspended particulate matter Trace elements |
description |
The natural radionuclides 231 Pa and 230 Th are incorporated into the marine sediment record by scavenging, or adsorption to various particle types, via chemical reactions that are not fully understood. Because these isotopes have potential value in tracing several oceanographic processes, we investigate the nature of scavenging using trans-Atlantic measurements of dissolved (<0.45μm) and particulate (0.8-51μm) 231 Pa and 230 Th, together with major particle composition. We find widespread impact of intense scavenging by authigenic Fe/Mn (hydr)oxides, in the form of hydrothermal particles emanating from the Mid-Atlantic ridge and particles resuspended from reducing conditions near the seafloor off the coast of West Africa. Biogenic opal was not found to be a significant scavenging phase for either element in this sample set, essentially because of its low abundance and small dynamic range at the studied sites. Distribution coefficients in shallow (<200m) depths are anomalously low which suggests either the unexpected result of a low scavenging intensity for organic matter or that, in water masses containing abundant organic-rich particles, a greater percentage of radionuclides exist in the colloidal or complexed phase. In addition to particle concentration, the oceanic distribution of particle types likely plays a significant role in the ultimate distribution of sedimentary 230 Th and 231 Pa. |
format |
Article in Journal/Newspaper |
author |
Hayes, Christopher T. Anderson, Robert F. Fleisher, Martin Q. Vivancos, Sebastian M. Lam, Phoebe J. Ohnemus, Daniel C. Huang, Kuo Fang Robinson, Laura F. Lu, Yanbin Cheng, Hai Edwards, R. Lawrence Moran, S. Bradley |
author_facet |
Hayes, Christopher T. Anderson, Robert F. Fleisher, Martin Q. Vivancos, Sebastian M. Lam, Phoebe J. Ohnemus, Daniel C. Huang, Kuo Fang Robinson, Laura F. Lu, Yanbin Cheng, Hai Edwards, R. Lawrence Moran, S. Bradley |
author_sort |
Hayes, Christopher T. |
title |
Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean |
title_short |
Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean |
title_full |
Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean |
title_fullStr |
Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean |
title_full_unstemmed |
Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean |
title_sort |
intensity of th and pa scavenging partitioned by particle chemistry in the north atlantic ocean |
publishDate |
2015 |
url |
https://hdl.handle.net/1983/ecec92cd-7b88-43e5-aacf-95ac56c9dfcc https://research-information.bris.ac.uk/en/publications/ecec92cd-7b88-43e5-aacf-95ac56c9dfcc https://doi.org/10.1016/j.marchem.2015.01.006 http://www.scopus.com/inward/record.url?scp=84922782845&partnerID=8YFLogxK |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Hayes , C T , Anderson , R F , Fleisher , M Q , Vivancos , S M , Lam , P J , Ohnemus , D C , Huang , K F , Robinson , L F , Lu , Y , Cheng , H , Edwards , R L & Moran , S B 2015 , ' Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean ' , Marine Chemistry , vol. 170 , pp. 49-60 . https://doi.org/10.1016/j.marchem.2015.01.006 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.marchem.2015.01.006 |
container_title |
Marine Chemistry |
container_volume |
170 |
container_start_page |
49 |
op_container_end_page |
60 |
_version_ |
1789335733054472192 |