Rippert, Nadine; Baumann, Karl-Heinz; Pätzold, Jürgen (2015): Stable isotope and Mg/Ca ratio of sediment core GeoB12610-2. PANGAEA, https://doi.org/10.1594/PANGAEA.841927, Supplement to: Rippert, N et al. (2015): Thermocline fluctuations in the western tropical Indian Ocean during the past 35 ka. Journal of Quaternary Science, 30(3), 201-210, https://doi.org/10.1002/jqs.2767
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To reconstruct the still poorly understood thermocline fluctuations in the western tropical Indian Ocean, a sediment core located off Tanzania (GeoB12610-2; 04°49.00'S, 39°25.42'E, 399 m water depth) covering the last 35 ka was analysed. Mg/Ca-derived temperatures from the planktonic foraminifera Globigerinoides ruber (white) and Neogloboquadrina dutertrei indicate that the last glacial was ~2.5 °C colder in the surface waters and ~3.5 °C colder in the thermocline compared with the present day. The depth of the thermocline and thus the stratification of the water column were shallower during glacial periods and deepened during the deglaciation and Holocene. The increased inflow of Southern Ocean Intermediate Waters via 'ocean tunnels' appears to cool the thermocline from below, leading to a similarity between the thermocline record of GeoB12610-2 with the Antarctic EDML temperature curve during the glacial. With rising sea level and the corresponding greater inflow of Red Sea Waters and Indonesian Intermediate Waters, the proportion of Southern Ocean Intermediate Water within the South Equatorial Current is reduced and, by Holocene time, the correlation to Antarctica is barely traceable. Comparison with the eastern Indian Ocean reveals that the thermocline depth reverses from the last glacial to present.
Latitude: -4.816667 * Longitude: 39.423667
Date/Time Start: 2008-02-11T16:42:00 * Date/Time End: 2008-02-11T16:42:00
Minimum DEPTH, sediment/rock: 0.02 m * Maximum DEPTH, sediment/rock: 3.30 m
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|3||Globigerinoides ruber sensu stricto, δ18O||G. ruber ss δ18O||‰ PDB||Baumann, Karl-Heinz||Mass spectrometer Finnigan MAT 251|
|4||Globigerinoides ruber sensu stricto, Magnesium/Calcium ratio||G. ruber ss Mg/Ca||mmol/mol||Baumann, Karl-Heinz||ICP-OES, Inductively coupled plasma - optical emission spectrometry|
|5||Sea surface temperature, annual mean||SST (1-12)||°C||Baumann, Karl-Heinz||Calculated from Mg/Ca ratios (Dekens et al. 2002)|
|6||Sea surface temperature, annual mean, standard deviation||SST (1-12) std dev||±||Baumann, Karl-Heinz||Calculated from Mg/Ca ratios (Dekens et al. 2002)|
|7||Neogloboquadrina dutertrei, δ18O||N. dutertrei δ18O||‰ PDB||Baumann, Karl-Heinz||Mass spectrometer Finnigan MAT 251|
|8||Neogloboquadrina dutertrei, Magnesium/Calcium ratio||N. dutertrei Mg/Ca||mmol/mol||Baumann, Karl-Heinz||ICP-OES, Inductively coupled plasma - optical emission spectrometry|
|9||Thermocline temperature||TT||°C||Baumann, Karl-Heinz||Calculated from Mg/Ca ratios (Anand et al., 2003)|
|10||Thermocline temperature, standard deviation||TT std dev||±||Baumann, Karl-Heinz||Calculated from Mg/Ca ratios (Anand et al., 2003)|
1258 data points