10.1594/PANGAEA.967561Deußen, KatharinaKatharinaDeußenUniversity of CologneVoigt, ClaudiaClaudiaVoigtUniversity of AlmeríaStaubwasser, MichaelMichaelStaubwasser0000-0002-5892-1115University of CologneMünker, CarstenCarstenMünker0000-0001-6406-559XUniversity of CologneEl-Shenawy, MohammedMohammedEl-ShenawyBeni-Suef UniversityKlipsch, SweaSweaKlipschUniversity of CologneHerwartz, DanielDanielHerwartz0000-0003-3604-8295Ruhr University BochumPANGAEA2024Messinian Salinity CrisisPaleoceanographypaleohumiditySeawater δ18OSr isotopestriple oxygen isotopesEvent labelOutcrop IDSample code/labelSample IDDate of determinationTime point, descriptiveδ18O, waterδ18O, water, standard deviationδ17O, waterδ17O, water, standard deviationOxygen-17 excessOxygen-17 excess, standard deviationδ Deuteriumδ Deuterium, standard deviationDeuterium excessDeuterium excess, standard deviationOutcrop sampleIsotope ratio mass spectrometer (IRMS), Thermo Fisher, MAT253Dataset10.1016/j.gca.2024.05.007672 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalGypsum samples collected in two outcrops located in the Polemi basin, Cyprus, have been analyzed for their triple oxygen and hydrogen isotopic composition. Respective methods are described in the original publication. The oxygen and hydrogen data provided here is derived from the crystal bound H2O within the Gypsum (CaSO4*2H2O), which allows calculating paleo-water isotopic compositions of the mother brine from which this gypsum precipitated during the Messinian Salinity Crisis. Because the isotopic composition of the mother brine is affected by the local hydroclimate at that time, such analyses allow reconstructing paleo-hydroclimate. One aim of the study was to reconstruct paleo-relative humidity of the Messinian Salinity Crisis. For this purpose, the triple oxygen and hydrogen isotope data was fitted to an appropriate isotope model that is based on the Craig and Gordon formula, which provides absolute paleo-relative humidity estimates. Model input and output data are summarized in Table S2.Isotope values are given in ‰ relative to standard mean ocean water (SMOW). For convenience, 17O-excess is given in ppm, which is ‰/1000.32.57532.57581834.81256734.813798CyprusGerman Research Foundationhttps://doi.org/10.13039/501100001659HE6357/4-1Heisenberg grant