The &amp;lt;sup&amp;gt;226&amp;lt;/sup&amp;gt;Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

Roy, Emilie Le; Sanial, Virginie; Charette, Matthew A.; Beek, Pieter van; Lacan, F.; Jacquet, Stéphanie; Henderson, Paul B.; Souhaut, Marc; García-Ibáñez, Maribel I.; Jeandel, Catherine; Pérez, Fíz F.; Sarthou, Géraldine

doi:10.5194/bg-2017-478

Cited by 4 publications

(3 citation statements)

References 70 publications

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“…However, we approximate the Atlantic seawater endmember as the average Eurasian Basin samples between 200 and 500 m (40.1 ± 0.6 nmol kg −1 , n = 30); these waters are Atlantic‐origin waters that have spent the least amount of time in the Arctic Ocean and can be identified by their warm temperature. This estimate is insignificantly different than a dBa Atl endmember of 42 ± 3 nmol kg −1 as determined from and used in previous literature (Guay et al., 2009; Le Roy et al., 2018; Roeske, Bauch, Rutgers van der Loeff, & Rabe, 2012). We apply the literature estimate throughout our analyses and consider it to be more conservative.…”

Section: Methodscontrasting

confidence: 61%

Strong Margin Influence on the Arctic Ocean Barium Cycle Revealed by Pan‐Arctic Synthesis

et al. 2022

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Early studies revealed relationships between barium (Ba), particulate organic carbon and silicate, suggesting applications for Ba as a paleoproductivity tracer and as a tracer of modern ocean circulation. But, what controls the distribution of barium (Ba) in the oceans? Here, we investigated the Arctic Ocean Ba cycle through a one‐of‐a‐kind data set containing dissolved (dBa), particulate (pBa), and stable isotope Ba ratio (δ138Ba) data from four Arctic GEOTRACES expeditions conducted in 2015. We hypothesized that margins would be a substantial source of Ba to the Arctic Ocean water column. The dBa, pBa, and δ138Ba distributions all suggest significant modification of inflowing Pacific seawater over the shelves, and the dBa mass balance implies that ∼50% of the dBa inventory (upper 500 m of the Arctic water column) was supplied by nonconservative inputs. Calculated areal dBa fluxes are up to 10 μmol m−2 day−1 on the margin, which is comparable to fluxes described in other regions. Applying this approach to dBa data from the 1994 Arctic Ocean Survey yields similar results. The Canadian Arctic Archipelago did not appear to have a similar margin source; rather, the dBa distribution in this section is consistent with mixing of Arctic Ocean‐derived waters and Baffin Bay‐derived waters. Although we lack enough information to identify the specifics of the shelf sediment Ba source, we suspect that a sedimentary remineralization and terrigenous sources (e.g., submarine groundwater discharge or fluvial particles) are contributors.

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Section: Methodscontrasting

confidence: 61%

Strong Margin Influence on the Arctic Ocean Barium Cycle Revealed by Pan‐Arctic Synthesis

et al. 2022

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“…This is notably the case for some dissolved TEIs, such as Fe (Tonnard et al, 2018), Al (Menzel Barraqueta et al, 2018b), and radium-226 ( 226 Ra) or barium (Ba) (Le Roy et al, 2017), as well as for particulate trace elements (Gourain et al, 2018). Overall, enhanced concentrations of TEIs close to the bottom suggest that continental shelves and margins acted as a source to adjacent waters.…”

Section: Links Between Water Masses and Teismentioning

confidence: 88%

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Sarthou¹,

Lherminier²,

Achterberg³

et al. 2018

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<p><strong>Abstract.</strong> The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this Special Issue, results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among seventeen articles. Here, the scientific context, project objectives and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.</p>

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“…Differently from 228 Ra,226 Ra in the oceans originates from the decay of its parent 230 Th and diffusion from deep-sea sediments, as less than 10% of 226 Ra inventory is supplied to the oceans by river inputs (Xu et al, 2022). Reports for the Atlantic Ocean (Broecker et al, 1976;Le Roy et al, 2018) showed the enrichment of this isotope in deep water sediments.…”

Section: Discussionmentioning

confidence: 99%

Spatial trends in the distribution of natural radioisotopes in the bottom sediments of Santos Basin (Brazil)

et al. 2023

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Ocean and Coastal ResearchActivities related to the marine exploration of oil and gas reservoirs tend to cause a concentration of natural radionuclides in related materials. As such, knowledge regarding the distribution of radionuclides in sedimentary basins with current oil operations is essential for modeling radiological hazards and possible risks of site contamination. This study investigated the distribution of 226Ra and 228Ra, radioisotopes from the 232U and 232Th decay chains in bottom sediment of the Santos basin. Sediment samples were collected from sites in a sampling grid based on depth contours and were analyzed through high-resolution gamma spectrometry. A distribution model of the spatial variation of these isotopes, the first of its kind for the Basin, supported the interpretation of similar tendencies in their distribution. From studying the spatial trends of the mean levels of the isotopes with descriptive statistics and variance analysis, latitudinal and bathymetric differences in the content of radionuclides emerged. These differences are probably derived from the distinct sources of these elements, as 226 Ra originates in the deep ocean from the decay of parent 230 Th and from the patterns of sedimentation driven by open ocean circulation, while 228Ra is supplied by terrigenous materials transported by the northward-flowing Brazilian Coastal Current.

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The <sup>226</sup>Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01

Cited by 4 publications

References 70 publications

Strong Margin Influence on the Arctic Ocean Barium Cycle Revealed by Pan‐Arctic Synthesis

Strong Margin Influence on the Arctic Ocean Barium Cycle Revealed by Pan‐Arctic Synthesis

Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Spatial trends in the distribution of natural radioisotopes in the bottom sediments of Santos Basin (Brazil)

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