These data are in association with a study conducted in the Santa Barbara Basin, California, USA that were used to develop a 20th century record of ocean acidification in the California Current Ecosystem. These data are based on the planktonic foraminifera species G. bulloides' shell characteristics, specifically area-normalized shell weight (ANSW) and include both core sample population average values and the individual data used to calculate sample averages. Additional information on collection of ANSW data can be obtained in Osborne et al., (2016) publication in Paleoceanography (doi:10.1002/2016PA002933). Carbonate system calculations for the downcore record determined based on the proxy CO32- values using the CO2SYS program are also included in this archive. Stable isotope geochemistry data measured by IRMS for individuals used in the ANSW and two additional study species (N. dutertrei) and N. incompta) are also included. Core radioisotope geochemistry data used to develop an age core for the multi-core record are included in this archive.

Supplement to: Osborne, Emily B; Thunell, Robert C; Gruber, Nicolas; Feely, Richard A; Benitez-Nelson, Claudia R (2020): Decadal variability in twentieth-century ocean acidification in the California Current Ecosystem. Nature Geoscience, 13(1), 43-49