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Niebler, Hans-Stefan; Hubberten, Hans-Wolfgang; Gersonde, Rainer (1999): Fig. 1. Delta 18O values of planktic formaminifera in surface sediment samples from the South Atlantic Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.55882, Supplement to: Niebler, H-S et al. (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

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Abstract:
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.
Coverage:
Median Latitude: -45.249456 * Median Longitude: -3.936011 * South-bound Latitude: -55.615000 * West-bound Longitude: -59.096700 * North-bound Latitude: -20.119000 * East-bound Longitude: 17.364600
Date/Time Start: 1988-03-12T10:28:00 * Date/Time End: 1992-11-22T00:00:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
Event(s):
PS1654-1 (PS12/557) * Latitude: -50.162333 * Longitude: 5.766333 * Date/Time: 1988-03-12T10:28:00 * Elevation: -3763.0 m * Penetration: 0.45 m * Recovery: 0.45 m * Location: Atlantic Indik Ridge * Campaign: ANT-VI/3 (PS12) * Basis: Polarstern * Method/Device: Giant box corer (GKG)
PS1750-7 (PS16/262) * Latitude: -42.695000 * Longitude: 12.183333 * Date/Time: 1989-11-04T05:47:00 * Elevation: -4709.0 m * Penetration: 0.08 m * Recovery: 0.08 m * Location: Van Heesen Ridge * Campaign: ANT-VIII/3 (PS16) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
PS1751-2 (PS16/267) * Latitude: -44.498333 * Longitude: 10.481000 * Date/Time: 1989-11-04T21:28:00 * Elevation: -4802.0 m * Penetration: 0.3 m * Recovery: 0.3 m * Location: Agulhas Basin * Campaign: ANT-VIII/3 (PS16) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2LATITUDELatitudeGeocode
3LONGITUDELongitudeGeocode
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Size fractionFractionNiebler, Hans-Stefan
7Globigerina bulloides, δ18OG. bulloides δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
8Globigerinella aequilateralis, δ18OG. aequilateralis δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
9Globigerinella calida, δ18OG. calida δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
10Globigerinita glutinata, δ18OG. glutinata δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
11Globigerinoides conglobatus, δ18OG. conglobatus δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
12Globigerinoides ruber white, δ18OG. ruber w δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
13Globigerinoides sacculifer, δ18OG. sacculifer δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
14Globigerinoides sacculifer sac, δ18OG. sacculifer sac δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
15Globorotalia crassaformis, δ18OG. crassaf. δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
16Globorotalia hirsuta, δ18OG. hirsuta δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
17Globorotalia inflata, δ18OG. inflata δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
18Globorotalia menardii, δ18OG. menardii δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
19Globorotalia scitula, δ18OG. scitula δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
20Globorotalia truncatulinoides dextral, δ18OG. truncatulinoides d δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
21Globorotalia truncatulinoides sinistral, δ18OG. truncatulinoides s δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
22Globorotalia tumida, δ18OG. tumida δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
23Neogloboquadrina dutertrei, δ18ON. dutertrei δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
24Neogloboquadrina pachyderma dextral, δ18ON. pachyderma d δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
25Neogloboquadrina pachyderma sinistral, δ18ON. pachyderma s δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
26Orbulina bilobata, δ18OO. bilobata δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
27Orbulina universa, δ18OO. universa δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
28Pulleniatina obliquiloculata, δ18OP. obliqu. δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
29Sphaeroidinella dehiscens, δ18OS. dehiscens δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
30Turborotalita quinqueloba, δ18OT. quinqueloba δ18O‰ PDBNiebler, Hans-StefanMass spectrometer Finnigan MAT 251
Size:
541 data points

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