Stable isotope ratios of foraminifera and sea surface temperature estimation of sediment core W2804A-14 ...

• Main Authors: Jasper, John P, Hayes, John M, Mix, Alan C, Prahl, Frederick G
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1994
• Subjects: Gravity corer; W8402A; Wecoma; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.729801; https://doi.pangaea.de/10.1594/PANGAEA.729801

Carbon isotopically based estimates of CO2 levels have been generated from a record of the photosynthetic fractionation of 13C (epsilon p) in a central equatorial Pacific sediment core that spans the last ~255 ka. Contents of 13C in phytoplanktonic biomass were determined by analysis of C37 alkadienones. These compounds are exclusive products of Prymnesiophyte algae which at present grow most abundantly at depths of 70-90 m in the central equatorial Pacific. A record of the isotopic compostion of dissolved CO2 was constructed from isotopic analyses of the planktonic foraminifera Neogloboquadrina dutertrei, which calcifies at 70-90 m in the same region. Values of epsilon p, derived by comparison of the organic and inorganic delta values, were transformed to yield concentrations of dissolved CO2 (c e) based on a new, site-specific calibration of the relationship between epsilon p and c e. The calibration was based on reassessment of existing epsilon p versus c e data, which support a physiologically based ... : Supplement to: Jasper, John P; Hayes, John M; Mix, Alan C; Prahl, Frederick G (1994): Photosynthetic fractionation of 13C and concentrations of dissolved CO2 in the central equatorial Pacific during the last 255,000 years. Paleoceanography, 9(6), 781-798 ...