Delta 13C measured on alkenones of surface sediment samples GeoB1008-6 to GeoB3603-1 from the South Atlantic ...

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 equatoria...

Full description

Bibliographic Details
Main Authors: Benthien, Albert, Andersen, Nils, Schulte, Sonja, Müller, Peter J, Schneider, Ralph R, Wefer, Gerold
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
Event label
Latitude of event
Longitude of event
Elevation of event
DEPTH, sediment/rock
Alkenone, unsaturation index UK37
Sea surface temperature, annual mean
Alkenone C372, δ13C
Alkenone, Ep
Carbon dioxide, total
-
Phosphate
Nitrate
Giant box corer
Gravity corer Kiel type
MultiCorer
Calculated
Mass spectrometer Finnigan MAT 252
Gas chromatography
M6/6
M9/4
M12/1
M16/1
M16/2
M20/2
SO84
M23/2
M23/3
JOPSII-6
M34/1
Meteor 1986
Sonne
Victor Hensen
Geosciences, University of Bremen GeoB
South Atlantic Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.63632
https://doi.pangaea.de/10.1594/PANGAEA.63632
Description
Summary: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 ... : Supplement to: Benthien, Albert; Andersen, Nils; Schulte, Sonja; Müller, Peter J; Schneider, Ralph R; Wefer, Gerold (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 ...

Similar Items