de Haas, Henk (2022): Dry bulk density, organic carbon and organic nitrogen in surface sediments of the North Sea sampled in 1994/1995 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.942428
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Abstract:
Dry bulk densities, organic carbon content, organic nitrogen content and the C:N-ratio of surface sediments were determined on 27 box cores from the shallow North Sea . The box corer used was supplied with a lid which closes the box during retrieval of the core. In this way disturbance of the surface layer of the core as a result of movements of the overlying water column is minimised. If a core showed cracks or disturbance structures at its surface it was discarded and a new core was taken. Of the undisturbed box cores (max length: 55 cm, diameter: 50 cm), the overlying bottom water was siphoned off and subsequently subsamples were made by slowly inserting wet PVC liners (diameter: 9 cm). After the subsampling the liners were stored upright at 4° C. Dry bulk densities were determined by taking subsamples of 5 cm3 wet sediment which were weighed, dried for 72 hours and reweighed. Dry bulk densities were calculated from the dry weight and the initial volume of the samples. Dry bulk densities were corrected for compaction during subsampling and storage by measuring the compaction of the sediments in the liners (if any) and assuming linear compaction over the whole sediment column. Total organic carbon and nitrogen contents of the same set of subsamples were determined using a Carlo Erba NAl500 series 2 Nitrogen Carbon Sulphur analyzer with sample preparation according to the method of Verardo et al. (1990). Depending on the grain size of the sediment, and the expected organic carbon contents, 20-40 mg of dry sediment was weighed into tin sample containers. Calcium carbonate was removed using sulphurous acid. Since sandy sediments have a low specific surface area; the amount of organic matter per weight unit of sediment is much lower in sands than in clayey sediments. As a result it proved to be impossible to determine reliable organic nitrogen values for the sandy sediments of the North Sea. The published data are supplementary to de Haas et al. (1997).
Supplement to:
de Haas, Henk; Boer, Wim; van Weering, Tjeerd C E (1997): Recent sedimentation and organic carbon burial in a shelf sea: the North Sea. Marine Geology, 144(1-3), 131-146, https://doi.org/10.1016/S0025-3227(97)00082-0
Related to:
Verardo, David J; Froelich, Philip N; McIntyre, Andrew (1990): Determination of organic carbon and nitrogen in marine sediments using the Carlo Erba NA-1500 analyzer. Deep Sea Research Part A. Oceanographic Research Papers, 37(1), 157-165, https://doi.org/10.1016/0198-0149(90)90034-S
Funding:
Coverage:
Median Latitude: 56.354383 * Median Longitude: 4.144828 * South-bound Latitude: 52.446333 * West-bound Longitude: -1.383000 * North-bound Latitude: 60.499500 * East-bound Longitude: 10.496500
Date/Time Start: 1994-05-25T00:00:00 * Date/Time End: 1995-06-30T00:00:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.345 m
Event(s):
VVA94-1 * Latitude: 54.103667 * Longitude: 8.171000 * Date/Time: 1994-05-25T00:00:00 * Elevation: -20.9 m * Location: North Sea * Campaign: 64PE94_VVA * Basis: Pelagia * Method/Device: Box corer (BC)
VVA94-2 * Latitude: 55.997500 * Longitude: 7.668667 * Date/Time: 1994-05-26T00:00:00 * Elevation: -27.7 m * Location: North Sea * Campaign: 64PE94_VVA * Basis: Pelagia * Method/Device: Box corer (BC)
VVA94-4 * Latitude: 58.216333 * Longitude: 10.247833 * Date/Time: 1994-05-28T00:00:00 * Elevation: -293.2 m * Location: North Sea * Campaign: 64PE94_VVA * Basis: Pelagia * Method/Device: Box corer (BC)
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | de Haas, Henk | |||
2 | Latitude of event | Latitude | de Haas, Henk | |||
3 | Longitude of event | Longitude | de Haas, Henk | |||
4 | Elevation of event | Elevation | m | de Haas, Henk | ||
5 | Date/Time of event | Date/Time | de Haas, Henk | |||
6 | DEPTH, sediment/rock | Depth sed | m | de Haas, Henk | Geocode | |
7 | Depth, top/min | Depth top | m | de Haas, Henk | ||
8 | Depth, bottom/max | Depth bot | m | de Haas, Henk | ||
9 | Mass | Mass | g | de Haas, Henk | Mass balance (Mass balance) | Weight (mass) of the measuring pot |
10 | Wet mass | Wet m | g | de Haas, Henk | Mass balance (Mass balance) | Weight (mass) of the wet sample incl. the mass of the pot |
11 | Dry mass | Dry m | g | de Haas, Henk | Mass balance (Mass balance) | Weight (mass) of the drysample incl. the mass of the pot |
12 | Density, dry bulk | DBD | g/cm3 | de Haas, Henk | Weight loss after drying | |
13 | Density, dry bulk | DBD | g/cm3 | de Haas, Henk | Calculated | Dry bulk density corrected for compaction |
14 | Nitrogen, organic, total | TON | % | de Haas, Henk | Element analyser CNS, Carlo Erba NA1500 series 2 | |
15 | Carbon, organic, total | TOC | % | de Haas, Henk | Element analyser CNS, Carlo Erba NA1500 series 2 | |
16 | Carbon/Nitrogen ratio | C/N | de Haas, Henk | Calculated | ||
17 | Comment | Comment | de Haas, Henk |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1392 data points