Knoke, Melina; Böning, Philipp; Dittmar, Thorsten; Friebe, Matthias; Gründken, Eleonore; Günther, Jana; Klaproth, Katrin; Ulber, Ina; Simon, Heike; Seidel, Michael (2025): Molecular composition of dissolved organic matter and biogeochemical parameters in porewater of Guaymas Basin (Gulf of California) deep subsurface sediments [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.974052
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Published: 2025-05-22 • DOI registered: 2025-06-20
Abstract:
Dissolved organic matter is an important constituent of the marine carbon cycle. Hydrothermal sediments in the Guaymas Basin (Gulf of California) release DOM into the ocean, impacting deep-sea ecosystems and the marine carbon cycle. This dataset includes molecular data of dissolved organic matter (DOM) from porewater and Soxhlet-extracted sediment samples collected during IODP Expedition 385 to the Guaymas Basin in 2019 from Sites 385-U1545, 385-U1547, 385-U1550, and 385-U1551. Additionally, two seawater samples from Atlantis expedition AT37-06 (dives 4864 and 4865) were analyzed. Hot-water Soxhlet extractions were performed on sediment samples to simulate DOM mobilization via hydrothermal circulation from the particulate phase. The DOM molecular composition was analyzed on solid-phase extracted (SPE) DOM using Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS). DOM molecular indices were calculated from the relative intensities derived from FT-ICR-MS. Furthermore, concentrations of dissolved organic carbon (DOC), total dissolved nitrogen (TDN), as well as dissolved organic nitrogen, sulfur, and phosphorus of SPE-DOM (DONSPE, DOSSPE, DOPSPE) and SPE-DOM stable carbon isotope data were determined. The DOC mobilization potentials were calculated to compare the porewater DOC concentrations with the water-extractable hot-water Soxhlet extraction DOC concentrations. Therefore, we expressed DOC concentrations in DOCPW* and DOCWE* in relation to the original TOC contents. Detailed methods are provided in Knoke et al. (in review, GCA).
Supplement to:
Knoke, Melina; Dittmar, Thorsten; Günther, Jana; Böning, Philipp; Teske, Andreas P; Seidel, Michael (2025): Hydrothermal mobilization and molecular transformations of dissolved organic matter from deep subsurface sediments. Geochimica et Cosmochimica Acta, S0016703725003084, https://doi.org/10.1016/j.gca.2025.06.005
Funding:
Deutsche Forschungsgemeinschaft, Bonn (DFG), grant/award no. 447583997: IODP GUAYMAS BASIN - The biogeochemistry of dissolved organic matter in hydrothermal Guaymas Basin sediments
Coverage:
Median Latitude: 27.426482 * Median Longitude: -111.567830 * South-bound Latitude: 27.200000 * West-bound Longitude: -111.889000 * North-bound Latitude: 27.637200 * East-bound Longitude: -111.210000
Date/Time Start: 2016-12-15T15:46:29 * Date/Time End: 2019-11-04T05:30:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
3 datasets
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Datasets listed in this bundled publication
- Knoke, M; Böning, P; Dittmar, T et al. (2025): Molecular dissolved organic matter composition of porewater and water-extractable hot-water Soxhlet extracts. https://doi.org/10.1594/PANGAEA.974049
- Knoke, M; Böning, P; Dittmar, T et al. (2025): Environmental parameter and mobilization potential of dissolved organic carbon in Guaymas Basin (Gulf of California) deep subsurface sediments. https://doi.org/10.1594/PANGAEA.974050
- Knoke, M; Böning, P; Dittmar, T et al. (2025): Stable carbon isotope composition for solid-phase extracted dissolved organic matter. https://doi.org/10.1594/PANGAEA.974051