(Table 3) Abundances of total foraminifera counted from multinet plankton tows in the Drake Passage, ANT X/5, August-September, 1992 ...

Calibration studies of Neogloboquadrina pachyderma (sinistral coiling, hereinafter referred to as N. pachyderma (s.)) in the South Atlantic raise questions about the interpretation of this species' carbon isotope composition as a paleoceanographic tracer of Southern Ocean surface nutrient conte...

Full description

Bibliographic Details
Main Authors: Kohfeld, Karen E, Anderson, Robert F, Lynch-Stieglitz, Jean
Format: Dataset
Language:English
Published: PANGAEA 2000
Subjects:
Event label
Latitude of event
Longitude of event
DEPTH, water
Depth, top/min
Depth, bottom/max
Split
Foraminifera, planktic
Volume
Comment
Multiple opening/closing net
ANT-X/5
Polarstern
Drake Passage
Neogloboquadrina pachyderma
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.855511
https://doi.pangaea.de/10.1594/PANGAEA.855511
Description
Summary:Calibration studies of Neogloboquadrina pachyderma (sinistral coiling, hereinafter referred to as N. pachyderma (s.)) in the South Atlantic raise questions about the interpretation of this species' carbon isotope composition as a paleoceanographic tracer of Southern Ocean surface nutrient contents. Carbon isotope disequilibrium between d13C of total CO2 (TCO2) of seawater and d13C of N. pachyderma (s.) increases systematically between 70° and 40°S. Several effects could cause the observed carbon isotope disequilibrium, including a combination of foraminiferal diet, calcification temperature, and carbonate ion chemistry. Combining these corrections to the d13C of N. pachyderma (s.) improves the reconstruction of the d13C of seawater TCO2 between 0 and 200 m in the modern South Atlantic. With these corrections applied, the d13C for equilibrium calcite reconstructed from N. pachyderma (s.) at the Last Glacial Maximum is very similar to preindustrial values, suggesting that one cannot rule out the possibility ... : Subsamples were collected from S. Schiel, Alfred-Wegener Institute, Bremerhaven, Germany, 1995, and counted at Lamont-Doherty Earth Observatory. ...

Similar Items