High resolution isotope and Mg/Ca record of sediment core GeoB12615-4

• Main Authors: Romahn, Sarah, Mackensen, Andreas, Groeneveld, Jeroen, Pätzold, Jürgen
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: AWI_Paleo; GeoB12615-4; Gravity corer (Kiel type); M75/2; M75/2_103-4; Meteor (1986); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Rufiji River - Latham Island; SL; Antarctic; Southern Ocean; Indian; Latham Island; Antarc*
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.829473; https://doi.org/10.1594/PANGAEA.829473

The importance of intermediate water masses in climate change and ocean circulation has been emphasized recently. In particular, Southern Ocean Intermediate Waters (SOIW), such as Antarctic Intermediate Water and Subantarctic Mode Water, are thought to have acted as active interhemispheric transmitter of climate anomalies. Here we reconstruct changes in SOIW signature and spatial and temporal evolution based on a 40 kyr time series of oxygen and carbon isotopes as well as planktic Mg/Ca based thermometry from Site GeoB12615-4 in the western Indian Ocean. Our data suggest that SOIW transmitted Antarctic temperature trends to the equatorial Indian Ocean via the "oceanic tunnel" mechanism. Moreover, our results reveal that deglacial SOIW carried a signature of aged Southern Ocean deep water. We find no evidence of increased formation of intermediate waters during the deglaciation.