The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01

22 pages, 10 figures.-- Emilie Le Roy . et al.-- This work is distributed under the Creative Commons Attribution 4.0 License We report detailed sections of radium-226 (226Ra, T1∕2 = 1602 years) activities and barium (Ba) concentrations determined in the North Atlantic (Portugal–Greenland–Canada) in...

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Main Authors: Le Roy, Emilie, García-Ibáñez, Maribel I., Pérez, Fiz F., Sarthou, G.
Other Authors: Ministerio de Economía y Competitividad (España)
Format: Article in Journal/Newspaper
Language:English
Published: European Geosciences Union 2018
Subjects:
Online Access:http://hdl.handle.net/10261/165687
https://doi.org/10.5194/bg-15-3027-2018
https://doi.org/10.13039/501100003329
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spelling ftcsic:oai:digital.csic.es:10261/165687 2024-02-11T10:04:27+01:00 The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01 Le Roy, Emilie García-Ibáñez, Maribel I. Pérez, Fiz F. Sarthou, G. Ministerio de Economía y Competitividad (España) 2018 http://hdl.handle.net/10261/165687 https://doi.org/10.5194/bg-15-3027-2018 https://doi.org/10.13039/501100003329 en eng European Geosciences Union #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2013-41048-P Publisher's version https://doi.org/10.5194/bg-15-3027-2018 Sí Biogeosciences 15: 3027-3048 (2018) 1726-4170 http://hdl.handle.net/10261/165687 doi:10.5194/bg-15-3027-2018 1726-4189 http://dx.doi.org/10.13039/501100003329 open artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.5194/bg-15-3027-201810.13039/501100003329 2024-01-16T10:30:52Z 22 pages, 10 figures.-- Emilie Le Roy . et al.-- This work is distributed under the Creative Commons Attribution 4.0 License We report detailed sections of radium-226 (226Ra, T1∕2 = 1602 years) activities and barium (Ba) concentrations determined in the North Atlantic (Portugal–Greenland–Canada) in the framework of the international GEOTRACES program (GA01 section – GEOVIDE project, May–July 2014). Dissolved 226Ra and Ba are strongly correlated along the section, a pattern that may reflect their similar chemical behavior. Because 226Ra and Ba have been widely used as tracers of water masses and ocean mixing, we investigated their behavior more thoroughly in this crucial region for thermohaline circulation, taking advantage of the contrasting biogeochemical patterns existing along the GA01 section. We used an optimum multiparameter (OMP) analysis to distinguish the relative importance of physical transport (water mass mixing) from nonconservative processes (sedimentary, river or hydrothermal inputs, uptake by particles and dissolved–particulate dynamics) on the 226Ra and Ba distributions in the North Atlantic. Results show that the measured 226Ra and Ba concentrations can be explained by conservative mixing for 58 and 65 % of the samples, respectively, notably at intermediate depth, away from the ocean interfaces. 226Ra and Ba can thus be considered conservative tracers of water mass transport in the ocean interior on the space scales considered here, namely, on the order of a few thousand kilometers. However, regions in which 226Ra and Ba displayed nonconservative behavior and in some cases decoupled behaviors were also identified, mostly at the ocean boundaries (seafloor, continental margins and surface waters). Elevated 226Ra and Ba concentrations found in deepwater in the West European Basin suggest that lower Northeast Atlantic Deep Water (NEADWl) accumulates 226Ra and Ba from sediment diffusion and/or particle dissolution during transport. In the upper 1500 m of the West European Basin, deficiencies in ... Article in Journal/Newspaper Greenland North Atlantic Northeast Atlantic Digital.CSIC (Spanish National Research Council) Canada Greenland West European Basin ENVELOPE(-28.000,-28.000,52.750,52.750)
institution Open Polar
collection Digital.CSIC (Spanish National Research Council)
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language English
description 22 pages, 10 figures.-- Emilie Le Roy . et al.-- This work is distributed under the Creative Commons Attribution 4.0 License We report detailed sections of radium-226 (226Ra, T1∕2 = 1602 years) activities and barium (Ba) concentrations determined in the North Atlantic (Portugal–Greenland–Canada) in the framework of the international GEOTRACES program (GA01 section – GEOVIDE project, May–July 2014). Dissolved 226Ra and Ba are strongly correlated along the section, a pattern that may reflect their similar chemical behavior. Because 226Ra and Ba have been widely used as tracers of water masses and ocean mixing, we investigated their behavior more thoroughly in this crucial region for thermohaline circulation, taking advantage of the contrasting biogeochemical patterns existing along the GA01 section. We used an optimum multiparameter (OMP) analysis to distinguish the relative importance of physical transport (water mass mixing) from nonconservative processes (sedimentary, river or hydrothermal inputs, uptake by particles and dissolved–particulate dynamics) on the 226Ra and Ba distributions in the North Atlantic. Results show that the measured 226Ra and Ba concentrations can be explained by conservative mixing for 58 and 65 % of the samples, respectively, notably at intermediate depth, away from the ocean interfaces. 226Ra and Ba can thus be considered conservative tracers of water mass transport in the ocean interior on the space scales considered here, namely, on the order of a few thousand kilometers. However, regions in which 226Ra and Ba displayed nonconservative behavior and in some cases decoupled behaviors were also identified, mostly at the ocean boundaries (seafloor, continental margins and surface waters). Elevated 226Ra and Ba concentrations found in deepwater in the West European Basin suggest that lower Northeast Atlantic Deep Water (NEADWl) accumulates 226Ra and Ba from sediment diffusion and/or particle dissolution during transport. In the upper 1500 m of the West European Basin, deficiencies in ...
author2 Ministerio de Economía y Competitividad (España)
format Article in Journal/Newspaper
author Le Roy, Emilie
García-Ibáñez, Maribel I.
Pérez, Fiz F.
Sarthou, G.
spellingShingle Le Roy, Emilie
García-Ibáñez, Maribel I.
Pérez, Fiz F.
Sarthou, G.
The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01
author_facet Le Roy, Emilie
García-Ibáñez, Maribel I.
Pérez, Fiz F.
Sarthou, G.
author_sort Le Roy, Emilie
title The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01
title_short The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01
title_full The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01
title_fullStr The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01
title_full_unstemmed The 226Ra–Ba relationship in the North Atlantic during GEOTRACES-GA01
title_sort 226ra–ba relationship in the north atlantic during geotraces-ga01
publisher European Geosciences Union
publishDate 2018
url http://hdl.handle.net/10261/165687
https://doi.org/10.5194/bg-15-3027-2018
https://doi.org/10.13039/501100003329
long_lat ENVELOPE(-28.000,-28.000,52.750,52.750)
geographic Canada
Greenland
West European Basin
geographic_facet Canada
Greenland
West European Basin
genre Greenland
North Atlantic
Northeast Atlantic
genre_facet Greenland
North Atlantic
Northeast Atlantic
op_relation #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2013-41048-P
Publisher's version
https://doi.org/10.5194/bg-15-3027-2018

Biogeosciences 15: 3027-3048 (2018)
1726-4170
http://hdl.handle.net/10261/165687
doi:10.5194/bg-15-3027-2018
1726-4189
http://dx.doi.org/10.13039/501100003329
op_rights open
op_doi https://doi.org/10.5194/bg-15-3027-201810.13039/501100003329
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