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  • Aluminium; Carbon, organic, total; Ceara Rise; continental shelf; DATE/TIME; DEPTH, sediment/rock; Fe speciation; GeoB4417-5; Iron; Iron, acid-soluble; Iron, dithionite-citrate-leached; Iron, dithionite extractable; Iron, total; Iron in pyrite; Iron oxalate; LATITUDE; LONGITUDE; M38/2; Meteor (1986); MUC; MultiCorer; porewater; Potassium; Sample code/label; Sample elevation; sediment  (1)
  • Binary Object; Binary Object (File Size); Description; Development of a consistent thermodynamic model of trace element - organic matter interactions in the Ocean; diatoms; dissolved organic carbon (DOC); GL807/2-1; nutrients; pH; speciation  (1)
  • PANGAEA  (2)
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  • PANGAEA  (2)
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  • 1
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    Unknown
    Present day and end of century (2100) iron speciation in the surface ocean (2024)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: The main component of this data set comprises calculated inorganic iron concentrations (Fe' = sum of iron hydroxide species). Inorganic iron is the most bioavailable chemical form of Fe in the ocean. Concentrations of Fe' were calculated according to two models, which we refer to as the discrete ligand model and the continuous binding site model. The discrete ligand model, which is currently applied to calculate Fe speciation in global biogeochemical models, combines dissolved Fe concentrations, conditional stability constants and ligand concentrations to obtain inorganic iron, whilst the continuous distribution model uses the NICA-Donnan model to obtain Fe'. The data supports the manuscript "Climate change decreases biologically available iron pool in the surface ocean." In this manuscript we use the continuous binding site model to show that surface ocean Fe' is sufficient for Fe-replete phytoplankton. We apply new estimates of Fe' to a simple phytoplankton growth model to show that both Fe' and relative growth rates will decrease under the high-end future climate scenario (SSP5-8.5) in all Fe-limited ocean regions, and will mitigate current projections of increased primary productivity in Fe-limited high latitudes regions such as the Southern Ocean. Overall, we demonstrate that Fe-binding site heterogeneity is critical for iron speciation, and must be considered when predicting the response of marine primary producers to ongoing changes in ocean chemistry.
    Keywords: Binary Object; Binary Object (File Size); Description; Development of a consistent thermodynamic model of trace element - organic matter interactions in the Ocean; diatoms; dissolved organic carbon (DOC); GL807/2-1; nutrients; pH; speciation
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Solid phase geochemistry (Al, Fe K, nitrate, organic carbon) of sediment core GeoB4417-5 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    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; Ceara Rise; continental shelf; DATE/TIME; DEPTH, sediment/rock; Fe speciation; GeoB4417-5; Iron; Iron, acid-soluble; Iron, dithionite-citrate-leached; Iron, dithionite extractable; Iron, total; Iron in pyrite; Iron oxalate; LATITUDE; LONGITUDE; M38/2; Meteor (1986); MUC; MultiCorer; porewater; Potassium; Sample code/label; Sample elevation; sediment
    Type: Dataset
    Format: text/tab-separated-values, 238 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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