Drake passage cold-water coral Ba/Ca and boron isotopes during NBP cruises NBP11-03 and NBP08-05 ...

• 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: Benthic foraminifera; circulation; cold-water corals; Drake Passage; pH; productivity; Event label; Latitude of event; Longitude of event; Elevation of event; Sample ID; Genus; Site; Depth, bathymetric; AGE; Age, uncertainty; Reference/source; Barium/Calcium ratio; δ11B, carbonate; Comment; Dredge; NBP0805; NBP1103; Nathaniel B. Palmer; Antarc*; Antarctic; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.924088; https://doi.pangaea.de/10.1594/PANGAEA.924088

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 ...