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  • 551  (1)
  • Aluminium; Carbon, organic, total; continental shelf; DATE/TIME; DEPTH, sediment/rock; Fe speciation; Iron; Iron, acid-soluble; Iron, dithionite-citrate-leached; Iron, dithionite extractable; Iron, total; Iron in pyrite; Iron oxalate; LATITUDE; LONGITUDE; M147; M147_23-1; Meteor (1986); MUC; MultiCorer; porewater; Potassium; Sample code/label; Sample elevation; sediment  (1)
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  • 1
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    Solid phase geochemistry (Al, Fe K, nitrate, organic carbon) of sediment core M147_23-1 (MUC04) (2022)
    PANGAEA
    Details
    Publication Date: 2024-03-28
    Description: Total element concentrations (Fe, Al, K) of the solid phase were measured after acid digestion (HF, HNO3 and HClO4) by inductively coupled plasma optical emission spectrometry (Varian ICP 720-ES). Solid phase iron speciation data were measured following single step sodium dithionite extraction (FeD) or sequential Fe extraction (FeAc, FeDith, FeOxal) by inductively coupled plasma optical emission spectrometry (Varian ICP 720-ES). Solid phase pyrite concentrations (FePy) were calculated stoichiometrically from photometrically measured S2- released via chromium(II) chloride reduction. Total organic carbon (TOC) of the sediment samples was measured in an Elemental Analyzer (Euro EA). Prior to analysis carbon bound to carbonate minerals was removed by leaching the sediment with 0.25 N HCl.
    Keywords: Aluminium; Carbon, organic, total; continental shelf; DATE/TIME; DEPTH, sediment/rock; Fe speciation; Iron; Iron, acid-soluble; Iron, dithionite-citrate-leached; Iron, dithionite extractable; Iron, total; Iron in pyrite; Iron oxalate; LATITUDE; LONGITUDE; M147; M147_23-1; Meteor (1986); MUC; MultiCorer; porewater; Potassium; Sample code/label; Sample elevation; sediment
    Type: Dataset
    Format: text/tab-separated-values, 211 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    El Niño-Driven Oxygenation Impacts Peruvian Shelf Iron Supply to the South Pacific Ocean (2021)
    Details
    Publication Date: 2021-10-15
    Description: Upwelling ocean currents associated with oxygen minimum zones (OMZs) supply nutrients fuelling intense marine productivity. Perturbations in the extent and intensity of OMZs are projected in the future, but it is currently uncertain how this will impact fluxes of redox-sensitive trace metal micronutrients to the surface ocean. Here we report seawater concentrations of Fe, Mn, Co, Cd, and Ni alongside the redox indicator iodide/iodate in the Peruvian OMZ during the 2015 El Niño event. The El Niño drove atypical upwelling of oxygen-enriched water over the Peruvian Shelf, resulting in oxidized iodine and strongly depleted Fe (II), total dissolved Fe, and reactive particulate Fe concentrations relative to non-El Niño conditions. Observations of Fe were matched by the redox-sensitive micronutrients Co and Mn, but not by non-redox-sensitive Cd and Ni. These observations demonstrate that oxygenation of OMZs significantly reduces water column inventories of redox-sensitive micronutrients, with potential impacts on ocean productivity.
    Keywords: 551 ; iron ; trace metals ; oxygen minimum zone ; El Niño ; eastern tropical south pacific ; shelf source
    Language: English
    Type: map
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
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