Abstract from Levy et al., 2023 - Temperature calibration of elevated Mg/Ca in planktic Foraminifera shells from the hypersaline Gulf of Aqaba (G-Cubed): The Mg/Ca of marine calcareous Planktic Foraminifera (PF) shells is commonly used for sea surface temperature reconstructions. However, compared to open marine environments, hypersaline (>40) oligotrophic seas have been shown to accommodate PF with higher Mg/Ca and divergent temperature to Mg/Ca relationships. To investigate influencing factors of PF Mg uptake in hypersaline regions, we measured the Mg/Ca of two flux dominating PF species, Globigerinoides ruber albus and Turborotalita clarkei, derived from a monthly resolved time series of sediment traps in the Gulf of Aqaba (GOA), northern Red Sea, as well as corresponding temperature, salinity, and pH values. The PF exhibit elevated Mg/Ca which cannot be explained by post-deposition or interstitial sediment diagenetic processes. Globigerinoides ruber albus displays Mg/Ca trends that strongly follow seasonal mixed layer temperature changes. Conversely, T. clarkei Mg/Ca trends do not follow temperature, but rather show significant Mg/Ca enrichment following mixing of the surface water column. We present a framework for incorporating elevated Mg/Ca into global Mg/Ca-T calibrations for G. ruber albus and present a new Mg/Ca-T calibration suitable for hypersaline marine environments. Here the supplementary code to produce the calibration models for Levy et al., 2023 can be accessed. It can be compiled using Wolfram Mathematica.