(Appendix) Th, U and Pa chemistry of North Atlantic deep-sea sediments ...

• Main Authors: Guihou, Abel, Pichat, Sylvain, Govin, Aline, Nave, Silvia Osorio, Michel, Elisabeth, Duplessy, Jean-Claude, Telouk, Philippe, Labeyrie, Laurent D
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, sediment/rock; AGE; Uranium-238; Uranium-238, standard deviation; Thorium-232; Thorium-232, standard deviation; Thorium-230; Thorium-230, standard deviation; Protactinium-231; Protactinium-231, standard deviation; Protactinium-231/Thorium-230 excess, decay-corrected; Protactinium-231/Thorium-230 excess, decay-corrected, standard deviation; Opal, biogenic silica; Opal, biogenic silica, standard deviation; Calypso Corer; Piston corer; Multi-collector inductively coupled plasma mass spectrometer MC-ICP-MS; MD101; PALEOCINAT; Marion Dufresne 1995; Le Suroît; Silvia; north atlantic current; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.816053; https://doi.pangaea.de/10.1594/PANGAEA.816053

The Atlantic Meridional Overturning Circulation (AMOC) is a key feature of the climate system. However, its role during climate change is still poorly constrained particularly during an Interglacial to Glacial climate transition and the associated global cooling. We present here the first reconstruction of the evolution of the vertical structure of the rate of the AMOC from the Last Interglaciation to the subsequent glaciation (128,000-60,000 years ago) based on sedimentary (231Pa/230Th) records. We show a deep AMOC during the interglacial warmth Marine Isotope Stage (MIS) 5.5 and a shallower glacial one during glacial MIS 4. The change between these two patterns occurred mostly during the glacial inception, i.e. the transition from MIS 5.5 to MIS 5.4. Our data show that AMOC was enhanced during this latter transition as a consequence of a large increase of the overturning rate of the Intermediate Waters, above 2500 m. We suggest that this AMOC pattern required a reinforced Gulf Stream-North Atlantic Current ... : Supplement to: Guihou, Abel; Pichat, Sylvain; Govin, Aline; Nave, Silvia Osorio; Michel, Elisabeth; Duplessy, Jean-Claude; Telouk, Philippe; Labeyrie, Laurent D (2011): Enhanced Atlantic Meridional Overturning Circulation supports the Last Glacial Inception. Quaternary Science Reviews, 30(13-14), 1576-1582 ...