Reckhardt, Anja; Beck, Melanie; Greskowiak, Janek; Schnetger, Bernhard; Böttcher, Michael Ernst; Gehre, Matthias; Brumsack, Hans-Jürgen (2021): Redox-sensitive metal concentrations and isotopic composition of dissolved sulfate in a sandy subterranean estuary of the southern North Sea (Spiekeroog Island, May 2014) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.933613
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Published: 2021-07-13 • DOI registered: 2021-08-12
Abstract:
The redox-sensitive metals Mn, Fe, U, Re, Mo, and V and sulfur cycling were studied within the subterranean estuary of a sand beach on Spiekeroog Island, Northern Germany. Pore water samples were obtained along a cross-shore transect down to 5 m below the sediment surface. Redox conditions range from oxic, close to the base of the dune, to sub- to anoxic towards the low water line. We could show that biogeochemical processes alter not only the pore water concentrations of the trace metals, but are also reflected by the O isotope- and to a minor degree the S isotope composition of dissolved sulfate. Seawater circulation through sediments of the upper beach (duneward part of the intertidal zone) removes U and V from solution, but serves as a source for Mn, Fe, Re, and Mo to the ocean. Pore water discharging from a berm close to the low water line exhibits lower U, V, and Re concentrations than adjacent seawater. This part of the beach thus serves as a sink for U, V, and Re, but as a source for Mn, Fe, and Mo. No significant Mo depletion is found in the pore water, due to the lack of dissolved sulfide.
Related to:
Reckhardt, Anja; Beck, Melanie; Greskowiak, Janek; Schnetger, Bernhard; Böttcher, Michael Ernst; Gehre, Matthias; Brumsack, Hans-Jürgen (2017): Cycling of redox-sensitive elements in a sandy subterranean estuary of the southern North Sea. Marine Chemistry, 188, 6-17, https://doi.org/10.1016/j.marchem.2016.11.003
Funding:
Deutsche Forschungsgemeinschaft, Bonn (DFG), grant/award no. 288572447: Biogeochemical processes in sandy beach sediments of Spiekeroog Island and Majorca
Coverage:
Median Latitude: 53.781140 * Median Longitude: 7.710815 * South-bound Latitude: 53.779946 * West-bound Longitude: 7.700090 * North-bound Latitude: 53.782821 * East-bound Longitude: 7.711924
Date/Time Start: 2014-05-14T00:00:00 * Date/Time End: 2014-05-22T00:00:00
Event(s):
Comment:
The seawater sample (event "Spiekeroog_CloseToBeach_May_2014") was taken on 2014-05-14 during low tide at 0.5 m water depth by submerging a precleaned polyethylene beaker.
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
618 data points