Estimation of sea surface temperature from sediment core PS1768-8

• Main Authors: Zielinski, Ulrich, Gersonde, Rainer, Sieger, Rainer, Fütterer, Dieter K
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 1998
• Subjects: Adelaide Island; Agulhas Basin; Agulhas Ridge; Antarctic Peninsula; ANT-II/3; ANT-II/4; ANT-III/3; ANT-IV/3; ANT-IV/4; ANT-IX/2; ANT-IX/4; ANT-V/4; ANT-VI/2; ANT-VI/3; ANT-VIII/3; ANT-VIII/5; ANT-X/4; ANT-X/5; ANT-XI/2; ANT-XI/4; Argentine Islands; Atka Bay; Atlantic Indik Ridge; Atlantic Ridge; AWI_Paleo; Barents Sea; Bransfield Strait; Camp Norway; Cape Basin; Cape Fiske; Conrad Rise; Cosmonauts Sea; CTD/Rosette; CTD-RO; Drake Passage; Elephant Island; Filchner Shelf; Filchner Trough; Giant box corer; GKG; Gould Bay; Gravity corer (Kiel type); Halley Bay; Indian-Antarctic Ridge; Islas Orcadas; Joinville Island; Kapp Norvegia; King George Island; Lyddan Island; Antarc*; Antarctic; Antarctica; Cosmonauts sea; Southern Ocean
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.759803; https://doi.org/10.1594/PANGAEA.759803

The quantitative diatom analysis of 218 surface sediment samples recovered in the Atlantic and western Indian sector of the Southern Ocean is used to define a base of reference data for paleotemperature estimations from diatom assemblages using the Imbrie and Kipp transfer function method. The criteria which justify the exclusion of samples and species out of the raw data set in order to define a reference database are outlined and discussed. Sensitivity tests with eight data sets were achieved evaluating the effects of overall dominance of single species, different methods of species abundance ranking, and no-analog conditions (e.g., Eucampia Antarctica) on the estimated paleotemperatures. The defined transfer functions were applied on a sediment core from the northern Antarctic zone. Overall dominance of Fragilariopsis kerguelensis in the diatom assemblages resulted in a close affinity between paleotemperature curve and relative abundance pattern of this species downcore. Logarithmic conversion of counting data applied with other ranking methods in order to compensate the dominance of F. kerguelensis revealed the best statistical results. A reliable diatom transfer function for future paleotemperature estimations is presented.