Sea surface temperatures and planktonic foraminifera d18O from the chilean margin ...

• Main Authors: Haddam, Naoufel, Siani, Giuseppe, Michel, Elisabeth, Kaiser, Jérôme, Lamy, Frank, Duchamp-Alphonse, Stéphanie, Hefter, Jens, Braconnot, Pascale, Dewilde, Fabien, Isguder, Gulay, Tisnérat-Laborde, Nadine, Thil, François, Durand, Nicolas, Kissel, Catherine
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2020
• Subjects: chilean margin; planktonic foraminifera d18O; Sea surface temperatures during the last 22 kyrs; Antarc*; Antarctic; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.918122; https://doi.pangaea.de/10.1594/PANGAEA.918122

The comparison between different climate model simulations of water hosing experiments under glacial conditions points toward diverging responses in Sea Surface Temperature changes (SST) especially in the Southeast Pacific (SEP). This suggests that reconstituting the latitudinal SST gradient in the SEP is a critical parameter for a better understanding of the mechanisms behind the abrupt climatic events since the last glacial period. Here we present, high-resolution records of SST, using planktonic foraminiferal assemblages and alkenone temperature reconstructions and stable oxygen and carbon isotopes from three deep-sea sediment cores along a latitudinal transect off the southern Chilean coast. This allowed us to reconstruct the variations of the latitudinal SST gradient and the Subtropical Front movements in the SEP. The SST results suggest a clear Antarctic timing consistent with the bipolar seesaw control, especially during the late glacial and the deglaciation. Our records do not suggest a complete ...