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Fahl, Kirsten; Stein, Ruediger (1997): Organic geochemistry on surface sediments from the Laptev Sea. PANGAEA,, Supplement to: Fahl, K; Stein, R (1997): Modern organic carbon deposition in the Laptev Sea and the adjacent continental slope: surface water productivity vs. terrigenous input. Organic Geochemistry, 26(5-6), 379-390,

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Sediment samples from the Laptev Sea, taken during the 1993 RV Polarstern expedition ARK IX/4 and the RV Ivan Kireyev expedition TRANSDRIFT I, were investigated for the amount and composition of their organic carbon fractions. Of major interest was the identification of different processes controlling organic carbon deposition (i.e. terrigenous supply vs. surface water productivity). Long-chain unsaturated alkenones derived from prymnesiophytes, and fatty acids derived from diatoms and dinoflagellates, were analysed by means of gas chromatography and mass spectrometry. First results on the distribution of these biomarkers in surface sediments indicate that the surface water productivity signal is well preserved in the sediment data. This is shown by the distribution of the 16:1(n-7) and 20:5(n-3) fatty acids indicative for diatoms, and the excellent correlation with the chlorophyll a concentrations in the surface water masses and the biogenic-opal content and increased hydrogen indices of the sediments. The high concentration of these unsaturated fatty acids in shallow water sediments shows the recent deposition of the organic material. In deep-sea sediments, on the other hand, the concentrations are low. This decreased content is typical for phytoplankton material which has been degraded by microorganisms or autoxidation. In general, the alkenone concentrations are very low, suggesting low production rates by prymnesiophytes. Only at one station from the lower continental margin influenced by the inflow of Atlantic water masses, were some higher amounts of alkenones determined. Long-chain n-alkanes as well as high C/N ratios and low hydrogen indices indicate the importance of (fluvial) supply of terrigenous organic matter.
Fourth Framework Programme (FP4), grant/award no. MAS3980185: Quaternary Environment of the Eurasian North
Median Latitude: 75.808359 * Median Longitude: 125.490462 * South-bound Latitude: 71.690000 * West-bound Longitude: 101.591667 * North-bound Latitude: 79.651667 * East-bound Longitude: 139.670000
Date/Time Start: 1993-08-11T00:00:00 * Date/Time End: 1993-09-23T00:00:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
IK93Z2-5 * Latitude: 73.666667 * Longitude: 113.996667 * Date/Time: 1993-08-11T00:00:00 * Elevation: -9.0 m * Recovery: 0.17 m * Location: Laptev Sea * Campaign: Transdrift-I * Basis: Ivan Kireyev * Method/Device: Box corer (Reineck) (BCR)
IK93Z3-4 * Latitude: 73.291667 * Longitude: 119.831667 * Date/Time: 1993-08-13T00:00:00 * Elevation: -11.0 m * Recovery: 0.33 m * Location: Laptev Sea * Campaign: Transdrift-I * Basis: Ivan Kireyev * Method/Device: Box corer (Reineck) (BCR)
IK93Z4-3 * Latitude: 72.033333 * Longitude: 130.126667 * Date/Time: 1993-08-24T00:00:00 * Elevation: -14.0 m * Recovery: 0.33 m * Location: Laptev Sea * Campaign: Transdrift-I * Basis: Ivan Kireyev * Method/Device: Box corer (Reineck) (BCR)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepth sedmGeocode
6Carbon, organic, totalTOC%Fahl, KirstenElement analyser CHN, LECO CNS 2000
7Hydrogen index, mass HC, per unit mass total organic carbonHI, HC/TOCmg/gFahl, KirstenRock eval pyrolysis (Behar et al., 2001)
8Long-chain n-alkanes, C27H56+C29H60+C31H64 per unit sediment massC27+C29+C31/sedµg/gFahl, KirstenGas chromatography
9Short-chain n-alkanes, C15H32+C17H36+C19H40 per unit sediment massC15+C17+C19/sedµg/gFahl, KirstenGas chromatography
260 data points

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