Knoke, Melina; Dittmar, Thorsten; Niggemann, Jutta; Wagner, Sasha; Förster, Oliver; Leclerc, Ahlyia J.; Ulber, Ina Ida; Günther, Jana; Simon, Heike; Seidel, Michael (2026): BPCA-derived dissolved black carbon concentrations in porewater and hot-water Soxhlet extracts of Guaymas Basin deep subsurface sediments [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997437 (DOI registration in progress)
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Published: 2026-09-29
Abstract:
Dissolved black carbon (DBC) is a condensed aromatic fraction of dissolved organic matter (DOM) and an important component of the marine carbon cycle. Hydrothermal systems have been suggested as a potential source of DBC to the deep ocean, but the mobilization and origin of DBC in organic-rich hydrothermal sediments remain poorly constrained.
This dataset contains benzene polycarboxylic acid (BPCA)-derived dissolved black carbon (DBC) concentrations from porewater and water-extractable hot-water Soxhlet extracts of deep subsurface sediments collected during IODP Expedition 385 in the Guaymas Basin (Gulf of California). Sample handling and the preparation and characterization of porewater and hot-water Soxhlet extracts have been described previously (Teske et al., 2021; Knoke et al., 2025). DBC was quantified using the benzene polycarboxylic acid method. Methanolic SPE-DOM extracts were oxidized with nitric acid, and the resulting BPCAs were quantified by ultra-performance liquid chromatography (UPLC). Benzene pentacarboxylic acid (B5CA) and benzene hexacarboxylic acid (B6CA) were considered for DBC quantification, and DBC concentrations were calculated according to Stubbins et al. (2015). The dataset includes B5CA and B6CA concentrations, B6CA/B5CA ratios, calculated DBC concentrations, and operationally defined hot-water-extractable DBC normalized to sediment total organic carbon content.
Keyword(s):
Related to:
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
Knoke, Melina; Dittmar, Thorsten; Niggemann, Jutta; Wagner, Sasha; Förster, Oliver; Leclerc, Ahlyia J.; Ulber, Ina Ida; Günther, Jana; Simon, Heike; Seidel, Michael (2026): Stable carbon isotope composition (δ¹³C) of dissolved black carbon in hot-water Soxhlet extracts [MS1.1] of Guaymas Basin deep subsurface sediments [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997438
Knoke, Melina; Dittmar, Thorsten; Niggemann, Jutta; Wagner, Sasha; Förster, Oliver; Leclerc, Ahlyia J.; Ulber, Ina Ida; Günther, Jana; Simon, Heike; Seidel, Michael (2026): Temperature-dependent changes in dissolved black carbon during heating of marine and terrestrial dissolved organic matter reference materials [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997430
References:
Dittmar, Thorsten (2008): The molecular level determination of black carbon in marine dissolved organic matter. Organic Geochemistry, 39(4), 396-407, https://doi.org/10.1016/j.orggeochem.2008.01.015
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
Stubbins, Aron; Spencer, Robert G M; Mann, Paul James; Holmes, R Max; McClelland, James W; Niggemann, Jutta; Dittmar, Thorsten (2015): Utilizing colored dissolved organic matter to derive dissolved black carbon export by arctic rivers. Frontiers in Earth Science, 3, https://doi.org/10.3389/feart.2015.00063
Teske, Andreas P; Lizarralde, Daniel; Höfig, Tobias Walter (2021): Guaymas Basin Tectonics and Biosphere. Proceedings of the International Ocean Discovery Program, International Ocean Discovery Program, 385, https://doi.org/10.14379/iodp.proc.385.2021
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: 27.503109 * Median Longitude: -111.718980 * South-bound Latitude: 27.206387 * West-bound Longitude: -111.889010 * North-bound Latitude: 27.637208 * East-bound Longitude: -111.219735
Date/Time Start: 2016-12-15T15:46:29 * Date/Time End: 2019-11-04T05:30:00
Minimum DEPTH, sediment/rock: -2.00 m * Maximum DEPTH, sediment/rock: 485.94 m
Event(s):
385-U1545A * Latitude: 27.637200 * Longitude: -111.889000 * Date/Time Start: 2019-09-26T20:45:00 * Date/Time End: 2019-10-01T09:25:00 * Elevation: -1593.5 m * Number of cores: 74 (APC = 17, HLAP = 31, XCB = 26) * Penetration: 503.3 m * Recovery: 77.3 % * Location: Guaymas Basin * Campaign: Exp385 * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL)
385-U1545B * Latitude: 27.637200 * Longitude: -111.888800 * Date/Time Start: 2019-10-01T09:25:00 * Date/Time End: 2019-10-04T16:45:00 * Elevation: -1594.2 m * Number of cores: 67 (APC = 17, HLAP = 40, XCB = 10) * Penetration: 387.3 m * Recovery: 87.8 % * Location: Guaymas Basin * Campaign: Exp385 * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL)
385-U1547B * Latitude: 27.506900 * Longitude: -111.678900 * Date/Time Start: 2019-10-16T21:25:00 * Date/Time End: 2019-10-20T05:00:00 * Elevation: -1732.2 m * Number of cores: 50 (APC = 10, HLAP = 14, XCB = 26) * Penetration: 209.8 m * Recovery: 76.9 % * Location: Guaymas Basin * Campaign: Exp385 * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Teske, Andreas P | |||
| 2 | LATITUDE | Latitude | Teske, Andreas P | Geocode | ||
| 3 | LONGITUDE | Longitude | Teske, Andreas P | Geocode | ||
| 4 | Date/time start | Date/time start | Teske, Andreas P | |||
| 5 | Date/time end | Date/time end | Teske, Andreas P | |||
| 6 | Sample code/label | Sample label | Teske, Andreas P | DSDP/ODP/IODP sample designation | ||
| 7 | Replicate | Repl | Knoke, Melina | |||
| 8 | Sample type | Samp type | Knoke, Melina | porewater or Soxhlet extract with ultrapure water after Knoke et al. (2025) | ||
| 9 | DEPTH, sediment/rock | Depth sed | m | Teske, Andreas P | Geocode | |
| 10 | Temperature, in rock/sediment | t | °C | Teske, Andreas P | ||
| 11 | Benzenepentacarboxylic acid | B5CA | µmol/l | Knoke, Melina | Benzene polycarboxylic acid method (BPCA); measured with Ultra Performance Liquid Chromatograph (UPLC), Waters Corporation, ACQUITY | quantified after nitric acid oxidation according to Dittmar (2008) |
| 12 | Benzenehexacarboxylic acid | B6CA | µmol/l | Knoke, Melina | Benzene polycarboxylic acid method (BPCA); measured with Ultra Performance Liquid Chromatograph (UPLC), Waters Corporation, ACQUITY | quantified after nitric acid oxidation according to Dittmar (2008) |
| 13 | Benzenepentacarboxylic acid/Benzenehexacarboxylic acid ratio | B6CA/B5CA | Knoke, Melina | Calculated | Molar ratio of B6CA to B5CA | |
| 14 | Black carbon, dissolved | DBC | µmol/l | Knoke, Melina | Benzene polycarboxylic acid method (BPCA); measured with Ultra Performance Liquid Chromatograph (UPLC), Waters Corporation, ACQUITY | Dissolved black carbon concentration calculated from B5CA and B6CA concentrations according to Stubbins et al. (2015) |
| 15 | Black carbon, dissolved/carbon, organic, dissolved ratio | DBC/DOC | % | Knoke, Melina | Benzene polycarboxylic acid method (BPCA); measured with Ultra Performance Liquid Chromatograph (UPLC), Waters Corporation, ACQUITY | Dissolved black carbon as percentage of dissolved organic carbon. DOC concentrations are published in Knoke et al. (2025) |
| 16 | Black carbon, dissolved per unit mass total organic carbon | DBC/TOC | g/kg | Knoke, Melina | Benzene polycarboxylic acid method (BPCA); measured with Ultra Performance Liquid Chromatograph (UPLC), Waters Corporation, ACQUITY | DBC concentration of water-extractable DOM normalized to the original sediment TOC content. See Knoke et al. (2025, 2026) |
| 17 | Black carbon, dissolved per unit mass total organic carbon | DBC/TOC | g/kg | Knoke, Melina | Benzene polycarboxylic acid method (BPCA); measured with Ultra Performance Liquid Chromatograph (UPLC), Waters Corporation, ACQUITY | DBC concentration of porewater DOM normalized to the original sediment TOC content. See Knoke et al. (2025, 2026) |
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:
1519 data points