Planktonic foraminiferal Mg/Ca ratios from top of different sediment cores from the Atlantic

Recent calibrations based on compiled sediment trap and laboratory culture data suggest moderate influences from salinity and pH. Core-tops are the best analogues to downcore samples used for paleoceanographic reconstruction with well-constrained environmental parameters and thus can be used to validate sediment trap and laboratory culture calibrations.

Here, we calibrate new core-top Mg/Ca data in Globigerinoides* ruber* (white) and *Trilobatus sacculifer *(without final sac-like chamber) with sea surface temperature, salinity, and pH. Part of these core-tops were previously used to argue for a large salinity effect on G. ruber (w) Mg/Ca [Arbuszewski et al., 2010]. Our new G. ruber (w) Mg/Ca data are on average 12% lower than the previous results.