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Thiele, Matthias; Surathu, Anil; Adam-Beyer, Nicole; Alawi, Malik; Müller, Christian; Voss, Maren; Melzner, Frank; Wallmann, Klaus; Böhnke-Brandt, Stefanie: Kiel Bight sedimentary data from sediment core incubation experiment in 2025 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997075 (dataset in review), In: Thiele, M et al.: Experimental data on enhanced benthic weathering in seasonally hypoxic Baltic Sea sediments in 2025 [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997072 (dataset in review)

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Abstract:
This dataset presents porewater and solid-phase geochemistry as well as microbial cell counts and microbial induced sulfate reduction rates from calcite-amended and unamended sediment cores collected in Kiel Bight in February 2025 during cruise L25-02b. Sediment cores were incubated at 8° C under controlled oxygen cycles in the laboratory of the home institute. Porewater was extracted by centrifugation and anoxic filtration. Solid phase analyses included COrg, CaCO3, total sulfur (%) and data from sequential Fe extraction (Cline Assay), calcium ions, Fe total, Mn total (ICP-OES), sulfate (IC), alkalinity, hydrogen sulfide. Sulfate reduction rates were quantified using 35S-radiotracer incubation and cold chromium distillation (Kallmeyer et al., 2004, Roy et al., 2014). Furthermore, cell counts were determined. The dataset supports evaluation of enhanced benthic weathering effects on sulfur cycling, iron speciation and microbial activity in dynamic and seasonally hypoxic coastal sediments.
Keyword(s):
cable bacteria; Candidatus Electrothrix; carbon dioxide removal; CDR; enhanced weathering; Ocean Alkalinity Enhancement (OAE); seasonal hypoxia; Transcriptomics
References:
Kallmeyer, Jens; Ferdelman, Timothy G; Weber, Andreas; Fossing, Henrik; Jørgensen, Bo Barker (2004): A cold chromium distillation procedure for radiolabeled sulfide applied to sulfate reduction measurements. Limnology and Oceanography-Methods, 2(6), 171-180, https://doi.org/10.4319/lom.2004.2.171
Røy, Hans; Weber, Hannah S; Tarpgaard, Irene H; Ferdelman, Timothy G; Jørgensen, Bo Barker (2014): Determination of dissimilatory sulfate reduction rates in marine sediment via radioactive 35 S tracer. Limnology and Oceanography-Methods, 12(4), 196-211, https://doi.org/10.4319/lom.2014.12.196
Project(s):
DAM CDRmare - RETAKE: CO2 removal by alkalinity enhancement: potential, benefits and risks (RETAKE)
Funding:
Federal Ministry of Research, Technology and Space (BMFTR), grant/award no. 03F0965A: DAM CDRmare - RETAKE-2, GEOMAR
Coverage:
Latitude: 54.572167 * Longitude: 10.177833
Date/Time Start: 2025-02-18T00:00:00 * Date/Time End: 2025-03-19T00:00:00
Minimum DEPTH, sediment, experiment: 0.0025 m * Maximum DEPTH, sediment, experiment: 0.1300 m
Event(s):
L25_02b_core * Latitude: 54.572167 * Longitude: 10.177833 * Date/Time: 2025-02-18T00:00:00 * Location: Eckernförder Bucht * Campaign: L25-02b * Basis: Littorina * Method/Device: MiniCorer (MIC) * Comment: sampling location of the sediments for the experiment
L25_02b_Experiment * Date/Time Start: 2025-02-24T00:00:00 * Date/Time End: 2025-03-19T00:00:00 * Method/Device: Laboratory experiment
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Type of studyStudy typeThiele, Matthias
2TreatmentTreatThiele, Matthias
3Sample code/labelSample labelThiele, Matthias
4DEPTH, sediment, experimentDepth sed expmThiele, MatthiasGeocode – mean
5Depth, sediment, experiment, bottom/maximumDepth sed botmThiele, Matthias
6Depth, sediment, experiment, top/minimumDepth sed topmThiele, Matthias
7Depth commentDepth commThiele, Matthiassediment depth [cm]
8Sampling date/time, experimentDate/time sampling expThiele, Matthiasdate
9Time in hoursTime hhThiele, Matthiastracer incubation time
10Sulfur, totalTS%Thiele, MatthiasElemental analyzer, EuroVector, EuroEA 3000
11Carbon, organicC org%Thiele, MatthiasElemental analyzer, EuroVector, EuroEA 3000
12Calcium carbonateCaCO3%Thiele, MatthiasElemental analyzer, EuroVector, EuroEA 3000
13Carbon/Nitrogen ratioC/NThiele, MatthiasElemental analyzer, EuroVector, EuroEA 3000
14Hydrogen sulfideH2Sµmol/lThiele, MatthiasSpectrophotometer, Hitachi, U-2800-A
15Sulfate[SO4]2-mmol/lThiele, MatthiasIon chromatograph, Metrohm, Eco IC
16Ammonium[NH4]+µmol/lThiele, MatthiasQuAAtro AutoAnalyzer
17Alkalinity, totalATmmol(Eq)/lThiele, MatthiasTitration, Metrohm, 876 Dosimat Plus
18ManganeseMnµmol/lThiele, MatthiasInductively coupled plasma optical emission spectrometry (ICP-OES)
19CalciumCammol/lThiele, MatthiasInductively coupled plasma optical emission spectrometry (ICP-OES)
20IronFeµmol/lThiele, MatthiasInductively coupled plasma optical emission spectrometry (ICP-OES)
21Nitrate[NO3]-µmol/lThiele, MatthiasQuAAtro AutoAnalyzer
22Nitrite[NO2]-µmol/lThiele, MatthiasQuAAtro AutoAnalyzer
23Iron II, ferrous iron, poorly crystalline, per unit sediment dry massp crys Fe(II)/sed dmµmol/gThiele, Matthiassequential endpoint extractions with 0.5M HCL, ferrozine assay
24Iron III, ferric iron, poorly crystalline, per unit sediment dry massp crys Fe(III)/sed dmµmol/gThiele, Matthiassequential endpoint extractions with 0.5M HCL, ferrozine assay
25Iron II, ferrous iron, crystalline, per unit sediment dry masscrys Fe(II)/sed dmµmol/gThiele, Matthiassequential endpoint extractions with 6M HCL, ferrozine assay
26Iron III, ferric iron, crystalline, per unit sediment dry masscrys Fe(III)/sed dmµmol/gThiele, Matthiassequential endpoint extractions with 6M HCL, ferrozine assay
27Iron II, ferrous iron, per unit sediment dry massFe(II)/sed dmµmol/gThiele, Matthiascitrate-ascorbate extraction, ferrozine assay
28Sulfate reduction rateSRRnmol/cm3/dayThiele, Matthiascold chromium destilation
29Microbial abundance, cellsMicrobial abund#/mlThiele, Matthiascell counts [cells/mL], DAPI stained FISH filter samples
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
767 data points

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