Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382

Scotia Sea and the Drake Passage is key towards understanding development of modern oceanic circulation patterns their implications for ice sheet growth decay. The sedimentary record southern basins documents regional tectonic, oceanographic climatic evolution since Eocene. However, a lack accurate age estimations has prevented calibration reconstructed history. upper was scientifically drilled first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering sediments down to ?643 676 m below sea floor Dove Pirie respectively. Here, we report newly acquired high resolution physical properties data constraints seismic sequences late Miocene. contains four basin-wide reflectors – Reflector-c, -b, -a -a' previously estimated be ?12.6 Ma, ?6.4 ?3.8 Ma ?2.6 By extrapolating our new model previous morpho-structural seismic-stratigraphic analyses wider region found, however, that discontinuities are much younger than thought. Reflector-c actually formed before 8.4 Reflector-b at ?4.5/3.7 Reflector-a ?1.7 Reflector-a' ?0.4 Ma. Our updated these major correlation with cryospheric events. According results, outflow Antarctic Bottom Water northern latitudes controlled Circumpolar Current flow from Subsequent variability sheets influenced pattern linked global changes early Pliocene, Mid-Pleistocene Marine Isotope Stage 11.