Redox-sensitive metal concentrations and isotopic composition of dissolved sulfate in a sandy subterranean estuary of the southern North Sea (Spiekeroog Island, May 2014)

DOI

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.

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.

Identifier
DOI https://doi.org/10.1594/PANGAEA.933613
Related Identifier References https://doi.org/10.1016/j.marchem.2016.11.003
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.933613
Provenance
Creator Reckhardt, Anja ORCID logo; Beck, Melanie ORCID logo; Greskowiak, Janek ORCID logo; Schnetger, Bernhard ORCID logo; Böttcher, Michael Ernst ORCID logo; Gehre, Matthias; Brumsack, Hans-Jürgen ORCID logo
Publisher PANGAEA
Publication Year 2021
Funding Reference Deutsche Forschungsgemeinschaft, Bonn https://doi.org/10.13039/501100001659 Crossref Funder ID 288572447 https://gepris.dfg.de/gepris/projekt/288572447 Biogeochemical processes in sandy beach sediments of Spiekeroog Island and Majorca
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 618 data points
Discipline Earth System Research
Spatial Coverage (7.700W, 53.780S, 7.712E, 53.783N)
Temporal Coverage Begin 2014-05-14T00:00:00Z
Temporal Coverage End 2014-05-22T00:00:00Z