Ebner, Berenice; Henkel, Susann; Kraal, Peter; Müller, Daniel; Köster, Male; Staubwasser, Michael; Laufer-Meiser, Katja; Kattein, Laura; Geibert, Walter; Kasten, Sabine (2025): Oxygen profiles, pore-water- and solid phase data of surface sediments retrieved from two fjords in South Georgia, sub-Antarctica [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.986658
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Published: 2025-10-30 • DOI registered: 2025-10-30
Abstract:
During the PS133/2 research cruise with the German research vessel RV Polarstern in the austral summer of November and December 2022 into the Southern Ocean, sediment samples were collected using a multicorer at five stations and a handheld gravity corer (UWITEC) from a zodiac at two additional stations across two fjords in South Georgia: King Haakon Bay and Cumberland Bay. The main objective was to determine and quantify the different sources and transport pathways of iron from two fjords of South Georgia into the open ocean. A high resolution O2 profile was measured in five MUC cores using a fibre-optic oxygen microsensor (Pyroscience) to determine the oxygen penetration depths. The MUC cores were sliced into 1-2 cm segments down to a maximum depth of 30 cm. Adjacent sediment cores were cut at the same depth resolution. Pore-water analyses were conducted for nitrite (NO2-), nitrate (NO3-), silicate (SiO2), phosphate (PO4³-), ammonium (NH4+), dissolved inorganic carbon (DIC), chloride (Cl-), sulfate (SO42-), hydrogen sulfide (H2S), alkalinity, dissolved Fe (dFe) and dissolved manganese (dMn). Surface sediment pore-water samples were analyzed for their iron isotopic composition (δ56Fe) at 6 stations. For the determination of an age model and the porosity, at five stations excess 210Pb (210PbXS) was measured using freeze-dried sediment samples. At six stations 0.5 M HCl extractions were performed to determine the 0.5 M HCl-extractable Fe(III)s (bound in poorly crystalline Fe-oxides) and Fe(II)s (bound in acid volatile sulfide). Samples of the same stations were used to obtain sulfate reduction rates (SRR).
Keyword(s):
Related to:
Ebner, Berenice; et al. (submitted): Drivers of benthic iron fluxes and the pore-water iron isotopic signature in sub-Antarctic surface fjord sediments.
Coverage:
Median Latitude: -54.236037 * Median Longitude: -36.839550 * South-bound Latitude: -54.401117 * West-bound Longitude: -37.567900 * North-bound Latitude: -54.065333 * East-bound Longitude: -36.142567
Date/Time Start: 2022-11-28T22:16:15 * Date/Time End: 2022-12-07T23:33:35
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Size:
3 datasets
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Datasets listed in this bundled publication
- Ebner, B; Henkel, S; Kraal, P et al. (2025): Oxygen profiles data of surface sediments retrieved from two fjords in South Georgia, sub-Antarctica. https://doi.org/10.1594/PANGAEA.986659
- Ebner, B; Henkel, S; Kraal, P et al. (2025): Pore-water data of surface sediments retrieved from two fjords in South Georgia, sub-Antarctica. https://doi.org/10.1594/PANGAEA.986660
- Ebner, B; Henkel, S; Kraal, P et al. (2025): Solid phase data of surface sediments retrieved from two fjords in South Georgia, sub-Antarctica. https://doi.org/10.1594/PANGAEA.986661