Fig. 1. Delta 18O values of planktic formaminifera in surface sediment samples from the South Atlantic Ocean, supplement to: Niebler, Hans-Stefan; Hubberten, Hans-Wolfgang; Gersonde, Rainer (1999): Oxygen Isotope Values of Planktic Foraminifera: A Tool for the Reconstruction of Surface Water Stratification. In: Fischer, G & Wefer, G (eds.), Use of Proxies in Paleoceanography - Examples from the South Atlantic, Springer, Berlin, Heidelberg, 165-189

• Main Authors: Niebler, Hans-Stefan, Hubberten, Hans-Wolfgang, Gersonde, Rainer
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 1999
• Subjects: Event label; LATITUDE; LONGITUDE; Elevation of event; DEPTH, sediment/rock; Size fraction; Globigerina bulloides, δ18O; Globigerinella aequilateralis, δ18O; Globigerinella calida, δ18O; Globigerinita glutinata, δ18O; Globigerinoides conglobatus, δ18O; Globigerinoides ruber white, δ18O; Globigerinoides sacculifer, δ18O; Globigerinoides sacculifer sac, δ18O; Globorotalia crassaformis, δ18O; Globorotalia hirsuta, δ18O; Globorotalia inflata, δ18O; Globorotalia menardii, δ18O; Globorotalia scitula, δ18O; Globorotalia truncatulinoides dextral, δ18O; Globorotalia truncatulinoides sinistral, δ18O; Globorotalia tumida, δ18O; Neogloboquadrina dutertrei, δ18O; Neogloboquadrina pachyderma dextral, δ18O; Neogloboquadrina pachyderma sinistral, δ18O; Orbulina bilobata, δ18O; Orbulina universa, δ18O; Pulleniatina obliquiloculata, δ18O; Sphaeroidinella dehiscens, δ18O; Turborotalita quinqueloba, δ18O; Giant box corer; MultiCorer; MiniCorer; CTD/Rosette; Mass spectrometer Finnigan MAT 251; ANT-VI/3; ANT-VIII/3; ANT-IX/4; ANT-X/4; ANT-X/5; ANT-X/6; Polarstern; South Atlantic in Late Quaternary Reconstruction of Budget and Currents SFB261; Antarctic; The Antarctic; Antarc*; Neogloboquadrina pachyderma; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.55882; https://doi.pangaea.de/10.1594/PANGAEA.55882

The d18Ocalcite composition of planktic foraminiferal shells in 59 samples collected from surface sediments between 34°S (south-eastern Subtropical Gyre) and 56°S (Antarctic Zone of the Antarctic Circumpolar Current) and additionally from 20°S (Walvis Ridge) in the South Atlantic Ocean documents the apparent calcification depth of 24 planktic foraminiferal taxa. Based on the d18Ocalcite signal of their shells, four depth related groups of foraminifera are distinguished, calcifying in a depth between 0 and 50 m (Sphaeroidinella dehiscens, Pulleniatina obliquiloculata, Orbulina bilobata, Globigerinoides sacculifer (with and without sac), Globigerinella aequilateralis, Globigerinoides ruber (white), Globigerina bulloides); 0 and 200 m (Globigerinoides conglobatus, Orbulina universa, Neogloboquadrina dutertrei, Turborotalita quinqueloba, Neogloboquadrina pachyderma (dextral and sinistral)); 100 and 250 m (Globorotalia tumida, Globorotalia menardii, Globigerinella calida, Globorotalia inflata); and deeper than 250 m (Globorotalia hirsuta, Globorotalia scitula, Globorotalia crassaformis, Globorotalia truncatulinoides (dextral and sinistral)). We propose a method to reconstruct temperature gradients between various depths in the water column, but most specifically between 30 m and 250 m, using the d18Ocalcite composition of foraminiferal calcite. Changes in past sea-surface water stratification in the temperate southern South Atlantic Ocean and in the Antarctic Circumpolar Current can be reconstructed in particular with G. bulloides, G. truncatulinoides and G. inflata. Modern temperature gradients between 30 m and 250 m water depth are reconstructed accurately within a range between 1.7 and 9.4 °C with a correlation coefficient of 0.77 and a standard deviation of ±1.3 °C.