Drake passage benthic foraminiferal abundance during the last deglaciation ...

• Main Authors: Stewart, Joseph A, Li, Tao, Spooner, Peter T, Burke, Andrea, Chen, Tianyu, Roberts, Jenny, Rae, James W B, Peck, Victoria L, Kender, Sev, Liu, Qian, Robinson, Laura F
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Core; DEPTH, sediment/rock; Calendar age; Wet mass; Total counts; Uvigerina bifurcata; Angulogerina earlandi; Uvigerina spp.; Fursenkoina fusiformis; Bulimina aculeata; Bulimina sp.; Nuttallides umbonifera; Cassidulina crassa; Cassidulina carinata; Melonis barleeanus; Melonis spp.; Oridorsalis umbonatus; Nonionella pulchella; Nonionella auris; Nonionella spp.; Pullenia quinqueloba; Pullenia bulloides; Alabaminella weddellensis; Epistominella exigua; Cibicidoides spp.; Hoeglundina elegans; Hoeglundina sp.; Bolivina spp.; Oridorsalis sp.; Pyrgo spp.; Fissurina spp.; Lagena spp.; Triloculina spp.; Globobulimina sp.; Foraminifera; Foraminifera, benthic agglutinated; Sphaeroidina bulloides; Number of taxa; Gravity corer; JR20110128; James Clark Ross; Antarc*; Antarctic; Drake Passage; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.924097; https://doi.pangaea.de/10.1594/PANGAEA.924097

The Antarctic Cold Reversal (ACR; 14.7 to 13 ka) phase of the last deglaciation saw a pause in the rise of atmospheric pCO2 and Antarctic temperature, contrasted with warming in the North. Mechanisms associated with interhemispheric heat transfer have been proposed to explain features of this event, but the response of marine biota and the carbon cycle are debated. The Southern Ocean is a key site of deep-water exchange with the atmosphere, hence deglacial changes in nutrient cycling, circulation, and productivity in this region may have global impact. Here we present a new perspective on the sequence of events in the deglacial Southern Ocean, that includes multi-faunal benthic assemblage (foraminifera and cold-water corals) and geochemical data (Ba/Ca, 14C, δ11B) from the Drake Passage. Our records feature anomalies during peak ACR conditions indicative of circulation, biogeochemistry, and regional ecosystem perturbations. Within this cold episode, peak abundances of thick-walled benthic foraminifera and ...