Rare earth elements and Nd isotopes tracing water mass mixing and particle-seawater interactions in the SE Atlantic

García-Solsona, Ester; Jeandel, Catherine; Labatut, Marie; Lacan, F.; Vance, Derek; Chavagnac, Valérie; Pradoux, Catherine

doi:10.1016/j.gca.2013.10.009

Cited by 92 publications

(91 citation statements)

References 111 publications

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“…Change of seawater signature occurs at such depths that it prevents invoking any other source but the sediment one. This was further observed by many authors, all confirming the first intuition of Lacan & Jeandel [45,[47][48][49][50][51][52][53][54][55]. Based on iron isotopic signatures measured in the water column, Radic et al [56] and Labatut et al [57] suggest that the process releasing dissolved iron into the seawater off the Papua New Guinea margin is a non-reductive dissolution (NRD) of sediments rather than dissimilatory iron reduction (DIR) which would imprint a more negative δ 56 Fe signature than what is observed ( figure 1a).…”

Section: (B) Submarine Weatheringsupporting

confidence: 81%

Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

Jeandel¹

2016

Phil. Trans. R. Soc. A.

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Section: (B) Submarine Weatheringsupporting

confidence: 81%

Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

Jeandel¹

2016

Phil. Trans. R. Soc. A.

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“…This could contribute to the negative DFe isotopic signature found at station S5. The impact of matter inputs from the margins of South Africa and the Antarctic Peninsula is supported by several other geochemical studies, based on rare earth element concentrations and Nd isotopic compositions (29,36), Pb, Cu, Ag, and Co concentrations (23,37), and Fe physical speciation (38).…”

Section: Discussionmentioning

confidence: 61%

“…S1) at stations S1 and S5, compared with S2-S3-S4. These differences cannot be quantitatively addressed in the present case because (i) we lack iron isotope data in the Indian Ocean and Weddell Sea that would be required for mixing calculations, (ii) S1 and to a lesser extent S5 are under the clear influence of lithogenic inputs (29), and (iii) S5 is under the influence of surface processes, air/sea fluxes, and biology.…”

Section: Discussionmentioning

confidence: 91%

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Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean

Abadie

Lacan

Radic

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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As an essential micronutrient, iron plays a key role in oceanic biogeochemistry. It is therefore linked to the global carbon cycle and climate. Here, we report a dissolved iron (DFe) isotope section in the South Atlantic and Southern Ocean. Throughout the section, a striking DFe isotope minimum (light iron) is observed at intermediate depths (200–1,300 m), contrasting with heavier isotopic composition in deep waters. This unambiguously demonstrates distinct DFe sources and processes dominating the iron cycle in the intermediate and deep layers, a feature impossible to see with only iron concentration data largely used thus far in chemical oceanography. At intermediate depths, the data suggest that the dominant DFe sources are linked to organic matter remineralization, either in the water column or at continental margins. In deeper layers, however, abiotic non-reductive release of Fe (desorption, dissolution) from particulate iron—notably lithogenic—likely dominates. These results go against the common but oversimplified view that remineralization of organic matter is the major pathway releasing DFe throughout the water column in the open ocean. They suggest that the oceanic iron cycle, and therefore oceanic primary production and climate, could be more sensitive than previously thought to continental erosion (providing lithogenic particles to the ocean), particle transport within the ocean, dissolved/particle interactions, and deep water upwelling. These processes could also impact the cycles of other elements, including nutrients.

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“…Slightly modified from (A) Arsouze et al (2007) and (B), (C) Lacan et al (2012). Additional data from Rutberg et al (2000), Singh et al (2012), Stichel et al (2012), Jang et al (2013), Rickli et al (2014) and Garcia-Solsona et al (2014).…”

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confidence: 99%

Authigenic Neodymium Isotope Record of Past Ocean Circulation

허영숙¹,

장광철²

2014

The Journal of the Petrological Society of Korea

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Proxies for paleo-circulation are drawing much interest with the recognition that ocean circulation plays an important part in the redistribution of heat and climate change on orbital and millennial timescales. In this review, we will introduce how neodymium isotope ratios of the authigenic fraction of marine sediments can be used as a proxy for ocean circulation along with analytical methods and two case studies. The first case study shows how the North Atlantic Deep Water (NADW) has varied over the glacial-interglacial and stadial-interstadial periods. The second case study shows how the freshwater budget and water circulation within the Arctic Ocean can be reconstructed for the last glacial period.

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Rare earth elements and Nd isotopes tracing water mass mixing and particle-seawater interactions in the SE Atlantic

Cited by 92 publications

References 111 publications

Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

Overview of the mechanisms that could explain the ‘Boundary Exchange’ at the land–ocean contact

Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean

Authigenic Neodymium Isotope Record of Past Ocean Circulation

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