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) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.263617, 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, https://doi.org/10.1007/s003670050052
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Abstract:
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
Project(s):
Coverage:
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: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
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.
Comment:
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)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Distance | Distance | km | Holmes, M Elizabeth | ||
| 7 | δ15N, bulk sediment | δ15N bulk | ‰ air | Holmes, M Elizabeth | Mass spectrometer Finnigan MAT 252 | |
| 8 | Nitrate, unutilized | NO3 un | % | Holmes, M Elizabeth | Calculated | f = Nitrate unutilized |
| 9 | Nitrate, unutilized | NO3 un | % | Holmes, M Elizabeth | Calculated | f = Nitrate unutilized, hind casted |
| 10 | Carbon, organic, total | TOC | % | Holmes, M Elizabeth | ||
| 11 | δ13C, organic carbon | δ13C Corg | ‰ PDB | Holmes, M Elizabeth | Mass spectrometer Finnigan MAT 252 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
156 data points
Data
| 1 Event | 2 Latitude | 3 Longitude | 4 Elevation [m] | 5 Depth sed [m] | 6 Distance [km] | 7 δ15N bulk [‰ air] (Mass spectrometer Finnigan MA...) | 8 NO3 un [%] (f = Nitrate unutilized, Calcu...) | 9 NO3 un [%] (f = Nitrate unutilized, hind ...) | 10 TOC [%] | 11 δ13C Corg [‰ PDB] (Mass spectrometer Finnigan MA...) |
|---|---|---|---|---|---|---|---|---|---|---|
| GeoB1028-4 | -20.0993 | 9.1777 | -2215 | 0 | 360 | 7.06 | 0.26 | 0.28 | 0.46 | -19.71 |
| GeoB1031-1 | -21.8892 | 7.1017 | -3103 | 0 | 630 | 11.25 | 0.14 | 0.13 | 0.15 | -19.24 |
| GeoB1032-2 | -22.9133 | 6.0267 | -2490 | 0 | 780 | 11.81 | 0.10 | 0.11 | 0.15 | -19.21 |
| GeoB1035-3 | -21.6017 | 5.0317 | -4450 | 0 | 810 | 11.78 | 0.09 | 0.12 | 0.14 | -20.00 |
| GeoB1704-1 | -19.4067 | 11.6117 | -399 | 0 | 100 | 4.84 | 0.39 | 0.42 | 5.81 | -19.68 |
| GeoB1705-2 | -19.5000 | 11.3817 | -647 | 0 | 130 | 4.72 | 0.39 | 0.42 | 4.19 | -19.93 |
| GeoB1706-1 | -19.5617 | 11.1750 | -980 | 0 | 150 | 4.81 | 0.39 | 0.42 | 4.27 | -20.16 |
| GeoB1707-2 | -19.6950 | 10.6550 | -1234 | 0 | 200 | 4.73 | 0.34 | 0.42 | 3.65 | -20.00 |
| GeoB1709-3 | -23.5883 | 10.7583 | -3837 | 0 | 370 | 9.35 | 0.21 | 0.18 | 0.24 | -19.16 |
| GeoB1710-2 | -23.4300 | 11.7033 | -2987 | 0 | 280 | 8.13 | 0.27 | 0.23 | 0.49 | -19.47 |
| GeoB1711-5 | -23.3167 | 12.3783 | -1964 | 0 | 200 | 5.81 | 0.28 | 0.35 | 1.74 | -20.18 |
| GeoB1712-2 | -23.2550 | 12.8033 | -1007 | 0 | 170 | 5.43 | 0.28 | 0.37 | 3.71 | -20.05 |
| GeoB1713-6 | -23.2200 | 13.0150 | -597 | 0 | 150 | 5.45 | 0.31 | 0.37 | 3.60 | -20.07 |
| GeoB1714-1 | -23.1367 | 13.5417 | -200 | 0 | 100 | 5.88 | 0.31 | 0.34 | 5.69 | -20.04 |
| GeoB1715-1 | -26.4767 | 11.6367 | -4097 | 0 | 360 | 9.79 | 0.13 | 0.04 | 0.34 | -18.97 |
| GeoB1716-2 | -27.9550 | 14.0050 | -1481 | 0 | 160 | 7.82 | 0.14 | 0.12 | 1.25 | -20.19 |
| GeoB1717-2 | -28.2083 | 14.4233 | -603 | 0 | 140 | 6.54 | 0.11 | 0.22 | 1.26 | -19.72 |
| GeoB1718-1 | -28.7083 | 15.2100 | -167 | 0 | 100 | 5.90 | 0.11 | 0.30 | 2.23 | -20.39 |
| GeoB1719-5 | -28.9250 | 14.1733 | -1024 | 0 | 200 | 6.22 | 0.11 | 0.26 | 2.41 | -19.59 |
| GeoB1720-4 | -29.0000 | 13.8283 | -2011 | 0 | 260 | 7.98 | 0.10 | 0.11 | 0.81 | -19.50 |
| GeoB1721-4 | -29.1750 | 13.0883 | -3079 | 0 | 340 | 9.37 | 0.09 | 0.05 | 0.38 | -18.97 |
| GeoB1722-3 | -29.4483 | 11.7500 | -3971 | 0 | 490 | 8.23 | 0.06 | 0.09 | 0.28 | -19.20 |
| GeoB1724-4 | -29.9717 | 8.0417 | -5102 | 0 | 840 | 9.26 | 0.04 | 0.06 | 0.51 | -19.52 |
| GeoB1726-2 | -30.2700 | 3.2617 | -1006 | 0 | 1250 | 10.46 | 0.02 | 0.03 | 0.10 | -20.06 |
| GeoB1728-3 | -29.8383 | 2.4067 | -2887 | 0 | 1340 | 10.81 | 0.01 | 0.03 | 0.19 | -19.45 |
| GeoB1729-1 | -28.8917 | 1.0017 | -4401 | 0 | 1450 | 11.64 | 0.01 | 0.02 | 0.16 | -19.29 |