10.1594/PANGAEA.965916Harbott, MarieMarieHarbott0000-0002-1355-1499Leibniz Centre for Tropical Marine Research, Bremen, GermanyRixen, TimTimRixen0000-0001-8376-891XLeibniz Centre for Tropical Marine Research, Bremen, GermanyKuhnert, HenningHenningKuhnert0000-0001-5242-4495MARUM - Center for Marine Environmental Sciences, University BremenKasemann, Simone ASimone AKasemann0000-0002-6913-7748MARUM - Center for Marine Environmental Sciences, University BremenMeixner, AnetteAnetteMeixnerMARUM - Center for Marine Environmental Sciences, University BremenJimenez, CarlosCarlosJimenezEnalia Physis Environmental Research CentreGonzález-Díaz, PatriciaPatriciaGonzález-DíazUniversidad de La HabanaWu, Henry CHenry CWu0000-0001-8975-5917Leibniz Centre for Tropical Marine Research, Bremen, GermanyPANGAEA2025B/CaBoron isotopeCarbonate chemistryCarbon isotopesAGEAgeSiderastrea siderea, δ13CSiderastrea siderea, Boron/Calcium ratioSiderastrea siderea, δ11BDiver-held corerCalculatedMass spectrometer, Finnigan, MAT 251; Mass spectrometer, Finnigan, MAT 253Inductively coupled plasma mass spectrometer (ICPMS), Analytik Jena, Plasma Quant MS EliteMulti-collector inductively coupled plasma mass spectrometer (MC-ICP-MS), ThermoFisher Scientific, NeptuneMake Our Planet Great Again-Ocean acidification crisis and global warming observations from tropical corals (MOPGA-OASIS)2005-07-01T00:00:00Dataset10.2307/229072410.1029/2023PA004717https://github.com/jesstierney/arand216 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalMassive scleractinian corals provide unique opportunities to reconstruct past climatic and chemical changes in the ocean, where there is no additional information. Regular pH measurements and carbonate chemistry observations of the ocean are still sparse but are essential to monitor the health of our oceans. Boron isotopes and B/Ca measured from coral skeletal material can be used to reconstruct the pH and the carbonate chemistry of their environment. The results from boron isotope measurements show an acidifying Gulf of Mexico over 160 years (1845-2005) and declining δ13C. A coral core was drilled in 2005 from a living Siderastrea siderea coral close to Havana, Cuba. The coral core was cut, slabbed and X-rayed at the Leibniz Center for Tropical Marine Research, Bremen. Yearly samples were drilled over two polyps with a Proxxon drill and 1 mm diamond-coated drill bit. Boron Isotopes were measured from the yearly samples for every 3rd year (if there was enough coral skeletal material) at the MARUM facilities in Bremen with a Thermo Fisher Neptune MC-ICP-MS. δ13C was measured on monthly samples on the Thermo Fisher Finnigan MAT 251 and Finnigan Mat 253plus isotope ratio mass spectrometer also at MARUM. Trace elements-Calcium ratios where measured at ZMT on a Plasma Quant MS Elite Inductively Coupled Plasma - Mass Spectrometer with monthly samples. The age model for the dataset was interpolated using the Arand software Ager and Timer (Howell et al., 2006). Outliers were identified with the detection method provided by Chen and Liu (1993).-82.423923.1277Bundesministerium für Bildung und Forschunghttps://doi.org/10.13039/50110000234757429626Make Our Planet Great Again-Ocean acidification crisis and global warming observations from tropical coralsDeutsche Forschungsgemeinschaft, Bonnhttps://doi.org/10.13039/501100001659RI 1194/2-1Deutsche Forschungsgemeinschaft, Bonnhttps://doi.org/10.13039/501100001659RI 1194/2-2