Citation:

PANGAEA.997072 (dataset in review)

Name: Experimental data on enhanced benthic weathering in seasonally hypoxic Baltic Sea sediments in 2025
License: https://creativecommons.org/licenses/by/4.0/
Keywords: cable bacteria; Candidatus Electrothrix; carbon dioxide removal; CDR; enhanced weathering; Ocean Alkalinity Enhancement (OAE); seasonal hypoxia; Transcriptomics

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Abstract:

This data collection comprises sedimentary porewater, solid-phase, microprofile measurements, cell counts and microbial sulfate reduction rates, from sediment cores collected in Kiel Bight in February 2025 (cruise L25-02b) and incubated under specific conditions over time. Furthermore, water sample data from within the core liner were taken. Cores were incubated at in-situ temperature under controlled oxygen depletion and subsequent reoxidation with calcite amended and unamended treatments. Data includes organic carbon (C org), Calcium carbonate (CaCO3), sulfur (S, %) and data from sequential iron (Fe) extraction from solid-phase, calcium ions, Fe total, manganese (Mn) total (ICP-OES), sulfate (ion chromatography, IC), alkalinity, hydrogen sulfide and nutrients from porewaters as well as sulfate reduction rates. Bottom water chemistry on top of the sediment core was monitored via optical oxygen sensors, alkalinity was titrated, calcium ion concentrations determined over time and dinitrogen was measured at the end of the experiments. High resolution electrochemical microprofiles resolved vertical gradients of sulfide, oxygen, pH and redox across the sediment-water interface. These datasets enable assessments of calcite dissolution, alkalinity generation and microbial responses to enhanced benthic weathering in seasonally hypoxic Baltic Sea sediments.

Keyword(s):

cable bacteria; Candidatus Electrothrix; carbon dioxide removal; CDR; enhanced weathering; Ocean Alkalinity Enhancement (OAE); seasonal hypoxia; Transcriptomics

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

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

Thiele, M; Surathu, A; Adam-Beyer, N et al. (in review): Kiel Bight microprofiling data from sediment core incubation experiment in 2025. https://doi.pangaea.de/10.1594/PANGAEA.997074
Thiele, M; Surathu, A; Adam-Beyer, N et al. (in review): Kiel Bight sedimentary data from sediment core incubation experiment in 2025. https://doi.pangaea.de/10.1594/PANGAEA.997075
Thiele, M; Surathu, A; Adam-Beyer, N et al. (in review): Kiel Bight sediment core liner water-column data from sediment core incubation experiment in 2025. https://doi.pangaea.de/10.1594/PANGAEA.997076