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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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) |
op_collection_id |
ftcsic |
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 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 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/bg-15-3027-201810.13039/501100003329 |
_version_ |
1790601044947894272 |