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Stief, Peter (2023): Cumulative carbon loss through leakage of dissolved organic carbon (DOC) from sinking diatom aggregates incubated in rotating pressure and control tanks [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.960465, In: Stief, Peter; Schauberger, Clemens; Becker, Kevin W; Elvert, Marcus; Balmonte, John Paul; Franco-Cisterna, Belén; Middelboe, Mathias; Glud, Ronnie N (2023): Effects of increasing hydrostatic pressure on sinking diatom aggregates [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.960357

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Published: 2023-08-11 • DOI registered: 2023-09-09

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Abstract:
The effect of increasing hydrostatic pressure on the microbial degradation, the organic matter composition, and the microbiome of 'marine snow' particles was studied in laboratory incubation experiments. Model aggregates were produced from the diatom Skeletonema marinoi and the natural microbial community of surface seawater collected in the Kattegat. The aggregates were incubated individually in rotating pressure and control tanks to keep them suspended during 20-day incubations in the dark and at 3°C. In the pressure tanks, hydrostatic pressure was increased at increments of 5 MPa per day to finally reach 100 MPa. This pressure scheme simulates the descent of diatom aggregates from the surface ocean down into a 10-km deep hadal trench. In the control tanks, pressure was always left at atmospheric level.
The cumulative carbon loss from sinking diatom aggregates through DOC leakage was calculated by summing up the difference in ambient DOC concentration between 2 consecutive sample retrievals (conducted at 4-day intervals during the 20-day incubation) and expressing the result relative to the initial carbon contents of the respective diatom aggregate.
Keyword(s):
biological carbon pump; Deep sea; Diatom; Hadal trench; hydrostatic pressure; Laboratory experiment; lipids; marine carbon cycle; marine snow; microbial community; pigments; Respiration
Funding:
Danish National Research Foundation (DG), grant/award no. DNRF145: Danish Center for Hadal Research, HADAL
Coverage:
Latitude: 55.368167 * Longitude: 10.426563
Date/Time Start: 2021-07-27T13:48:26 * Date/Time End: 2022-11-02T08:27:14
Event(s):
HADAL_aggregates * Latitude: 55.368167 * Longitude: 10.426563 * Date/Time Start: 2021-07-27T13:48:26 * Date/Time End: 2022-11-02T08:27:14 * Method/Device: Laboratory experiment
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1ExperimentExpStief, Peter
2Type of studyStudy typeStief, Peter
3Date/time start, experimentDate/time start expStief, Peter
4Date/time end, experimentDate/time end expStief, Peter
5Experimental treatmentExp treatStief, Peter
6ReplicateReplStief, Peter
7Treatment: time afterT:time afterhStief, PeterTime after starting the experimental incubation
8Treatment: pressureT:pressureMPaStief, PeterDigital manometer, Keller AG, LEO5
9Carbon loss through DOC leakage, cumulativeC loss leak%Stief, PeterTotal organic carbon analyzer, Shimadzu, TOC-Lmean; After filtration through 0.3-µm glass fiber filters
10Carbon loss through DOC leakage, cumulative, standard deviationC loss leak std dev±Stief, Peter
11LaboratoryLabStief, Peter
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
132 data points

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