Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) ...

• Main Authors: Crosta, Xavier, Civel-Mazens, Matthieu, Cortese, Giuseppe, Michel, Elisabeth, Mazaud, Alain, Ther, Olivier, Ikehara, Minoru, Itaki, Takuya
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Diatom; Kerguelen; MD11-3353; SST; transfer function; DEPTH, sediment/rock; AGE; Sea surface temperature; Calypso Corer II; SST, calculated from diatoms; MD185; Marion Dufresne 1995; Antarctic; Southern Ocean; The Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.1594/pangaea.945937; https://doi.pangaea.de/10.1594/PANGAEA.945937

In the Southern Ocean (SO), climate-driven latitudinal migrations of the Antarctic Circumpolar Current (ACC) frontal system impact large-scale ocean circulation and primary productivity. Latitudinal migrations may not have been identical in all SO basins due to the presence or absence of regional bathymetric obstacles. The Antarctic Polar Front (APF), defined by the 3–5 °C surface temperature range and the 2 °C subsurface temperature minimum at 200 m, is particularly important for nutrient redistribution and biodiversity, influencing the soft tissue carbon pump in the modern SO. However, previous assessments of its migrations in the past, mostly based on a single metric or indirect observations, were not always robust. Here, we combine a new proxy for subsurface temperature (sub-ST) reconstructions based on radiolarian assemblages (sub-STrad), with relative abundance variations of key radiolarian species, and sea-surface temperatures (SST) reconstructions, based on diatom assemblages (SSTdiat), to refine ...