A Southern Portuguese Margin Perspective of Marine Isotope Stage 47—An Interglacial in the 41 kyr World

In order to better understand interglacial climate variability within the 41 kyr world, we produced high-resolution records for Marine Isotope Stage (MIS) 47 (1424–1452 ka) at IODP Site U1387 (36°48′ N, 7°43′ W) on southern Portuguese margin. Using benthic and planktonic foraminifera stable isotope records, Uk’37 sea-surface temperature (SST), plankton assemblage data investigated Mediterranean Outflow Water (MOW) surface water conditions. The MOW-level indicate a poorly ventilated sluggish bottom current during MIS 48/MIS transition in association with insolation maximum, whereas well-ventilated MOW formed contourite layer second maximum. δ18O record shows fairly abrupt change deglaciation of 48, while waters experienced terminal stadial event that was associated initial cooling freshening followed by stepwise warming until SST reached 1450 ka. Interglacial conditions 24 °C or higher persisted 1427 ka, although warm prevailed into 46. persistent prolonged warmth is attributed northward expansion subtropical gyre as reflected dominance subtropical-tropical species presence coccolithophores taxa.