Uvigerina spp. δ¹⁸O and Mg/Ca measurements from sediment cores JR244-GC528 and MD07-3076 ...

• Main Authors: Roberts, Jenny, Gottschalk, Julia, Skinner, Luke C, Peck, Victoria L, Kender, Sev, Elderfield, Henry, Waelbroeck, Claire, Vázquez Riveiros, Natalia, Hodell, David A
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Antarctic; Jenny; Luke; Antarc*
• Online Access: https://dx.doi.org/10.1594/pangaea.856702; https://doi.pangaea.de/10.1594/PANGAEA.856702

Explanations of the glacial-interglacial variations in atmospheric pCO2 invoke a significant role for the deep ocean in the storage of CO2. Deep-ocean density stratification has been proposed as a mechanism to promote the storage of CO2 in the deep ocean during glacial times. A wealth of proxy data supports the presence of a "chemical divide" between intermediate and deep water in the glacial Atlantic Ocean, which indirectly points to an increase in deep-ocean density stratification. However, direct observational evidence of changes in the primary controls of ocean density stratification, i.e., temperature and salinity, remain scarce. Here, we use Mg/Ca-derived seawater temperature and salinity estimates determined from temperature-corrected d18O measurements on the benthic foraminifer Uvigerina spp. from deep and intermediate water-depth marine sediment cores to reconstruct the changes in density of sub-Antarctic South Atlantic water masses over the last deglaciation (i.e., 22-2 ka before present). We find ... : Supplement to: Roberts, Jenny; Gottschalk, Julia; Skinner, Luke C; Peck, Victoria L; Kender, Sev; Elderfield, Henry; Waelbroeck, Claire; Vázquez Riveiros, Natalia; Hodell, David A (2016): Evolution of South Atlantic density and chemical stratification across the last deglaciation. Proceedings of the National Academy of Sciences, 113(3), 514-519 ...