Ca, Fe measurements, Zr/Rb ratios and Sortable silt records of sediment core PS97/093-2 ...

• Main Authors: Toyos, Maria H, Lamy, Frank, Lange, Carina Beatriz, Lembke-Jene, Lester, Saavedra-Pellitero, Mariem, Esper, Oliver, Arz, Helge Wolfgang
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2019
• Subjects: Antarctic Circumpolar Current; Drake Passage; sortable silt; XRF-Ca counts; XRF-Fe counts; Zr/Rb; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.905998; https://doi.pangaea.de/10.1594/PANGAEA.905998

The Antarctic Circumpolar Current (ACC) is the world's largest current system connecting all three major basins of the global ocean. Our knowledge of glacial‐interglacial changes in ACC dynamics in the southeast Pacific is not well constrained and presently only based on reconstructions covering the last glacial cycle. Here we use a combination of mean sortable silt grain size of the terrigenous sediment fraction (10–63 μm, ) and X‐ray fluorescence scanner‐derived Zr/Rb ratios as flow strength proxies to examine ACC variations at the Pacific entrance to the Drake Passage (DP) in the vicinity of the Subantarctic Front. Our results indicate that at the DP entrance, ACC strength varied by ~6–16% on glacial‐interglacial time scales, yielding higher current speeds during interglacial times and reduced current speeds during glacials. We provide evidence that previous observations of a reduction in DP throughflow during the last glacial period are part of a consistent pattern extending for at least the last 1.3 Ma. ... : Supplement to: Toyos, Maria H; Lamy, Frank; Lange, Carina B; Lembke-Jene, Lester; Saavedra-Pellitero, Mariem; Esper, Oliver; Arz, Helge Wolfgang (accepted): Antarctic Circumpolar Current dynamics at the Pacific entrance to the Drake Passage over the past 1.3 million years. Paleoceanography and Paleoclimatology ...