Description: 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.
Global identifier:
Doi(
"10.1594/PANGAEA.933613",
)
Measurements {
domain: Unspecified,
station: None,
measured_variables: [
"Event label",
"Station label",
"DEPTH, sediment/rock",
"LATITUDE",
"LONGITUDE",
"UTM Zone, Universal Transverse Mercator",
"UTM Easting, Universal Transverse Mercator",
"UTM Northing, Universal Transverse Mercator",
"Distance",
"ELEVATION",
"pH",
"Salinity",
"Nitrate",
"Sulfate",
"Hydrogen sulfide",
"Manganese",
"Iron",
"Molybdenum",
"Rhenium",
"Uranium",
"Vanadium",
"δ34S, sulfate",
"δ18O, sulfate",
"δ18O, water",
],
methods: [
"Conductivity probe",
"Calculated",
"Ion chromatography",
"Photometric",
"ICP-OES/ICP-MS",
"ICP-OES/ICP-MS",
"ICP-MS",
"ICP-MS",
"ICP-MS",
"ICP-MS",
],
}
Dataset
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.
Origins: /Wissenschaft/PANGAEA
Tags: Ästuar ? Molybdän ? Sulfid ? Vanadium ? Sulfat ? Nitrat ? Sand ? Meerwasser ? Rhenium ? Gezeitenzone ? Uran ? Geografische Koordinaten ? Kind ? Metall ? Insel ? Salzgehalt ? Ozeanzirkulation ? Niedrigwasser ? Strand ? Wasserprobe ? Sediment ? Wasser ? Wasserstand ? Nordsee ? Oxygen isotopes ? Sulfur isotopes ?
Bounding boxes: 7.70009° .. 7.711924° x 53.779946° .. 53.782821°
License: cc-by/4.0
Language: Englisch/English
Issued: 2021-07-13
Modified: 2021-09-17
Time ranges: 2014-05-14 - 2014-05-22
Accessed 1 times.