Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution ...

• Main Authors: Chandler, David M, Langebroek, Petra M
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Alkenone; Diatom assemblage; Eemian; foraminiferal assemblages; Interglacial; Last Interglacial; marine isotope stage 5; marine isotope stage 6; Marine Sediment Core; Mg/Ca; Penultimate Glacial Maximum; proxy; Sea surface temperature; Southern Ocean; AGE; Number of observations; Sea surface temperature, anomaly; Sea surface temperature, anomaly, standard deviation; Confidence interval; Multiple investigations; Tipping Points in Antarctic Climate Components TIPACCs; Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.1594/pangaea.938621; https://doi.pangaea.de/10.1594/PANGAEA.938621

Southern Ocean marine sediments provide an important archive of Quaternary glacial-interglacial climate changes. Sea surface temperature (SST) reconstructions in the Southern Ocean depend exclusively on the fossils or geochemical signatures of planktic organisms, but the strengths of these SST proxies remain poorly quantified in this region. To improve confidence in Southern Ocean paleoclimate reconstructions, we first evaluated the reliability of SST proxies employed at Quaternary glacial-interglacial time scales, focusing on three key potential problems: advection/dispersion, seasonality, and non-thermal influences. On that basis, we selected foraminifera assemblages, long-chain alkenones (UK'37 index), diatom assemblages, and the Globigerina bulloides Mg/Ca ratio as the most reliable SST proxies in the Southern Ocean. We also revised calibrations where appropriate, using core-top sediment databases. Overall, Southern Ocean SST reconstructions using these recommended proxies and calibrations should be ...