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Holmes, M Elizabeth (1998): Bulk 15N, and 13Corg ratios, and calculation of unutilized nitrate of surface samples off the southwest coast of Africa (Table 1). PANGAEA,, Supplement to: Holmes, M Elizabeth; Müller, Peter J; Schneider, Ralph R; Segl, Monika; Wefer, Gerold (1998): Spatial variation in euphotic zone nitrate utilization based on 15N in surface sediments. Geo-Marine Letters, 18(1), 58-65,

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Bulk delta15N values in surface sediment samples off the southwestern coast of Africa were measured to investigate the biogeochemical processes occurring in the water column. Nitrate concentrations and the degree of utilization of the nitrate pool are the predominant controls on sedimentary delta15N in the Benguela Current region. Denitrification does not appear to have had an important effect on the delta15N signal of these sediments and, based on delta15N and delta13C, there is little terrestrial input.
Related to:
Holmes, M Elizabeth (1996): Reconstruction of surface ocean nitrate utilization in the Southeast Atlantic Ocean based on stable nitrogen isotopes. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 83, 113 pp, urn:nbn:de:gbv:46-ep000102121
Median Latitude: -25.056994 * Median Longitude: 10.353372 * South-bound Latitude: -30.270000 * West-bound Longitude: 1.001667 * North-bound Latitude: -19.406667 * East-bound Longitude: 15.210000
Date/Time Start: 1988-03-02T00:00:00 * Date/Time End: 1992-01-22T00:00:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
GeoB1028-4 * Latitude: -20.099333 * Longitude: 9.177667 * Date/Time: 1988-03-02T00:00:00 * Elevation: -2215.0 m * Penetration: 0.37 m * Recovery: 0.35 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Karb.-sand, Forams.
GeoB1031-1 * Latitude: -21.889167 * Longitude: 7.101667 * Date/Time: 1988-03-03T00:00:00 * Elevation: -3103.0 m * Penetration: 0.2 m * Recovery: 0.2 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Foram.-sand, weiß
GeoB1032-2 * Latitude: -22.913333 * Longitude: 6.026667 * Date/Time: 1988-03-04T00:00:00 * Elevation: -2490.0 m * Penetration: 0.32 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Foram.-schl., weiß, Pterop.
f = Nitrate unutilized from the ratio of [NO3] in surface water (from Conkright et al., 1994) to [NO3] in upwelled water and f estimated based on sedimentary 15N using Eqs. 1 and 2 from Altabet and Francois (1994, doi:10.1029/93GB03396)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepth sedmGeocode
6DistanceDistancekmHolmes, M Elizabeth
7δ15N, bulk sedimentδ15N bulk‰ airHolmes, M ElizabethMass spectrometer Finnigan MAT 252
8Nitrate, unutilizedNO3 un%Holmes, M ElizabethCalculatedf = Nitrate unutilized
9Nitrate, unutilizedNO3 un%Holmes, M ElizabethCalculatedf = Nitrate unutilized, hind casted
10Carbon, organic, totalTOC%Holmes, M Elizabeth
11δ13C, organic carbonδ13C Corg‰ PDBHolmes, M ElizabethMass spectrometer Finnigan MAT 252
156 data points

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