Sea ice diatoms from Late Quaternary sediments in the Scotia Sea ...

• Main Authors: Allen, Claire Susannah, Pike, Jennifer, Pudsey, Carol J
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2011
• Subjects: Kasten corer; Piston corer; Trigger corer; Composite Core; Antarc*; Antarctica; Scotia Sea; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.762140; https://doi.pangaea.de/10.1594/PANGAEA.762140

Sea-ice growth and decay in Antarctica is one of the biggest seasonal changes on Earth, expanding ice cover from 4x10**6 km**2 to a maximum of 19x10**6 km**2 during the austral winter. Analyses of six marine sediment cores from the Scotia Sea, SW Atlantic, yield records of sea-ice migration across the basin since the Lateglacial. The cores span nearly ten degrees of latitude from the modern seasonal sea-ice zone to the modern Polar Front. Surface sediments in the cores comprise predominantly diatomaceous oozes and muddy diatom oozes that reflect Holocene conditions. The cores exhibit similar down-core stratigraphies with decreasing diatom concentrations and increasing magnetic susceptibility from modern through to the Last Glacial Maximum (LGM). Sediments in all cores contain sea-ice diatoms that preserve a signal of changing sea-ice cover and permit reconstruction of past sea-ice dynamics. The sea-ice records presented here are the first to document the position of both the summer and winter sea-ice cover ... : Supplement to: Allen, Claire Susannah; Pike, Jennifer; Pudsey, Carol J (2011): Last glacial-interglacial sea-ice cover in the SW Atlantic and its potential role in global deglaciation. Quaternary Science Reviews, 30(19-20), 2446-2458 ...