Not logged in
Data Publisher for Earth & Environmental Science

Benthien, Albert; Andersen, Nils; Schulte, Sonja; Müller, Peter J; Schneider, Ralph R; Wefer, Gerold (2002): Delta 13C measured on alkenones of surface sediment samples GeoB1008-6 to GeoB3603-1 from the South Atlantic. PANGAEA,, Supplement to: Benthien, A et al. (2002): Carbon isotopic composition of the C37:2 alkenone in core-top sediments of the South Atlantic Ocean: Effects of CO2 and nutrient concentrations. Global Biogeochemical Cycles, 16(1), 1012,

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

We have analyzed the stable carbon isotopic composition of the diunsaturated C37 alkenone in 29 surface sediments from the equatorial and South Atlantic Ocean. Our study area covers different oceanographic settings, including sediments from the major upwelling regions off South Africa, the equatorial upwelling, and the oligotrophic western South Atlantic. In order to examine the environmental influences on the sedimentary record the alkenone-based carbon isotopic fractionation (Ep) values were correlated with the overlying surface water concentrations of aqueous CO2 ([CO2(aq)]), phosphate, and nitrate. We found Ep positively correlated with 1/[CO2(aq)] and negatively correlated with [PO43-] and [NO3-]. However, the relationship between Ep and 1/[CO2(aq)] is opposite of what is expected from a [CO2(aq)] controlled, diffusive uptake model. Instead, our findings support the theory of Bidigare et al. (1997, doi:10.1029/96GB03939) that the isotopic fractionation in haptophytes is related to nutrient-limited growth rates. The relatively high variability of the Ep-[PO4] relationship in regions with low surface water nutrient concentrations indicates that here other environmental factors also affect the isotopic signal. These factors might be variations in other growth-limiting resources such as light intensity or micronutrient concentrations.
Median Latitude: -13.404206 * Median Longitude: -10.443734 * South-bound Latitude: -35.121667 * West-bound Longitude: -45.870000 * North-bound Latitude: 5.333333 * East-bound Longitude: 17.533333
Date/Time Start: 1988-02-21T00:00:00 * Date/Time End: 1996-01-04T00:00:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
GeoB1008-6 * Latitude: -6.593983 * Longitude: 10.318800 * Date/Time: 1988-02-21T00:00:00 * Elevation: -3100.0 m * Penetration: 0.45 m * Recovery: 0.43 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Tonschlamm, braungrau
GeoB1016-3 * Latitude: -11.770500 * Longitude: 11.681900 * Date/Time: 1988-02-25T00:00:00 * Elevation: -3411.0 m * Penetration: 18 m * Recovery: 12.41 m * Location: Angola Basin * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: cc: Ton, grüngrau
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.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Alkenone, unsaturation index UK37UK37Benthien, AlbertCalculatedcalculated after Müller et al, (1998, doi:10.1016/S0016-7037(98)00097-0), Bentien and Müller (2000, doi:10.1016/S0967-0637(00)00030-3)
7Sea surface temperature, annual meanSST (1-12)°CBenthien, Albert
8Alkenone C37:2, δ13CC37:2 δ13C‰ PDBBenthien, AlbertMass spectrometer Finnigan MAT 252
9Alkenone, EpEp‰ PDBBenthien, AlbertGas chromatography
10Carbon dioxide, totalTCO2µmol/lBenthien, AlbertCalculated
11Carbon dioxide, totalTCO2µmol/lBenthien, AlbertCalculatedAngola Coastal Current and Benguela Coastal Current provinces at 70 ppmv correction values
12--Benthien, AlbertCalculatedb-value in per mil µmol/L
13--Benthien, AlbertCalculatedb-value in per mil µmol/L, Angola Coastal Current and Benguela Coastal Current provinces at 70 ppmv correction values
14Phosphate[PO4]3-µmol/lBenthien, Albertfrom World Ocean Atlas 1994
15Nitrate[NO3]-µmol/lBenthien, Albertfrom World Ocean Atlas 1994
249 data points

Download Data

Download dataset as tab-delimited text — use the following character encoding:

View dataset as HTML