Here's a global gridded data set: https://cds.climate.copernicus.eu/cdsapp#!/dataset/insitu-gridded-observations-global-and-regional?tab=overview https://cds.cl

Here's a global gridded data set: https://cds.climate.copernicus.eu/cdsapp#!/dataset/insitu-gridded-observations-global-and-regional?tab=overview https://cds.climate.copernicus.eu/cdsapp#!/dataset/insitu-gr... from which you can easily extract ocean temperature data from 1750 onwards, including links to documentation of input data sets: https://datastore.copernicus-climate.eu/documents/insitu-gridded-observations-global-and-regional/C3S_D62.3.5.1.v1_202110_Documentation_observation_data_v1.pdf https://datastore.copernicus-climate.eu/documents/insitu-gri..., in case you were asking in good faith.