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| Titel |
Radium-226 and barium as tracers of water masses in the North Atlantic (GA01-GEOTRACES) |
| VerfasserIn |
Emilie Le Roy, Virginie Sanial, Matthew Charette, Paul Henderson, Stéphanie Jacquet, Maribel García-Ibáñez, Fiz Pérez, Pascale Lherminer, Marc Souhaut, Catherine Jeandel, François Lacan, Pieter van Beek |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144268
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| Publikation (Nr.) |
 EGU/EGU2017-8075.pdf |
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| Zusammenfassung |
| In this study, we report concentrations of radium-226 (226Ra, t1∕2=1602 y) and barium
determined along the GEOVIDE section conducted in the North Atlantic (May-July 2014;
Portugal-Greenland-Canda) in the framework of the international GEOTRACES program. A
high vertical resolution (up to 22 depths per station) was achieved by analyzing small
volumes (∼10 L) of seawater for 226Ra using a radon emanation technique. We will present
the distribution of 226Ra activities and barium concentrations in contrasting biogeochemical
regions of the North Atlantic (Iberian margin, West European Basin, Reykjanes Ridge,
Irminger Sea, Greenland margin and Labrador Sea). These regions strongly differ in terms of
boundary inputs, biogeochemistry and deep water formation. We observe a linear correlation
between 226Ra and barium along the GEOVIDE section, which results from the
dominantly conservative behavior of the two tracers. However, deviations from the linear
correlation between 226Ra and Ba are found in several places. The potential causes for
such deviations are investigated. Optimum multi-parameter (OMP) analysis was
thus used to distinguish the relative importance of physical transport (i.e., water
mass mixing) from non-conservative processes (sedimentary, river or hydrothermal
inputs; uptake by particles) on the 226Ra and Ba distribution in the North Atlantic. |
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