Southern Ocean marine sediment core sea-ice records for the last 150,000 years

• Main Authors: Chadwick, Matthew, Crosta, Xavier, Esper, Oliver, Kohfeld, Karen E
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: 177-1093; 177-1094; 20; AGE; ANT-IX/4; ANT-VI/3; ANT-VIII/3; ANT-X/5; ANT-XI/2; ANT-XI/4; ANT-XVIII/5a; ANT-XXII/4; ANT-XXVI/2; Atlantic Indik Ridge; Atlantic Ridge; Calculated; see reference(s); COMPCORE; Composite Core; Conrad Rise; Core; DEPTH; sediment/rock; Diatoms; Eastern Weddell Sea; Southern Ocean; ELT27; ELT27.023-PC; Eltanin; Event label; Fragilariopsis curta and Fragilariopsis cylindrus; GC; Glacial - Interglacial; Gravity corer; Gravity corer (Kiel type); Joides Resolution; KL; Leg177; marine sediments; PAGES_C-SIDE; Past Global Changes - Cycles of Sea-Ice Dynamics in the Earth system; PC; Piston corer; Piston corer (BGR type); Polarstern; PS12; PS12/553; PS16; PS16/311; Antarctic; Weddell; Weddell Sea; Antarc*; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.943275; https://doi.org/10.1594/PANGAEA.943275

Antarctic sea ice forms a critical part of the Southern Ocean and global climate system. The behaviour of Antarctic sea ice throughout the last glacial-interglacial (G-IG) cycle (12,000-130,000 years) allows us to investigate the interactions between sea ice and climate under a large range of mean climate states. Understanding both temporal and spatial variations in Antarctic sea ice across a G-IG cycle is crucial to better understanding the G-IG regulation of atmospheric CO2, ocean circulation, nutrient cycling and productivity. Published qualitative and quantitative records of G-IG sea-ice, which cover at least 30,000 of the last 150,000 years, are compiled from twenty four marine sediment cores. All records include the combined relative abundances of the two sea-ice related diatoms Fragilariopsis curta and F. cylindrus (FCC). The FCC proxy is a qualitative indicator of winter sea-ice presence (Gersonde and Zielinski, 2000). Fourteen of the core records also have quantitative reconstructions of winter sea-ice concentrations (WSIC) and/or sea-ice duration (SID). These quantitative reconstructions were produced by applying a modern analog technique transfer function (Crosta et al., 1998; Esper & Gersonde 2014) to the preserved diatom species assemblages.