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They aren't guesses. Those charts are reflecting oxygen isotope ratios (which are measured directly), among countless others (which are covered in Hasen et al)
by monkburger 2y ago
They aren't guesses. Those charts are reflecting oxygen isotope ratios (which are measured directly), among countless others (which are covered in Hasen et al)
Oxygen isotope ratios are more or less ^16O and ^18O. These isotopes are distributed differently based on temperature and precipitation patterns, which can be recorded in ice cores, ocean sediments, lake sediments, and even in the shells of marine organisms. ^16O is more often seen in 'warmer' events, vs ^18O
- pcdoodle 2y agowe're talking about a 1C variance, I'd like to know what calibrated instrument and organization has the data for review going back a bit further than 1979.
- monkburger 2y agoThere's a few: NOAA's GHCN: Global Historical Climatology Network, Its coverage includes data going back several centuries, with the earliest records starting around 1750. HadCRUIT (Hadley Centre/Climatic Research Unit Temperature). Has marine (ship-borne and buoy) and terrestrial (land-based stations) sources. NASA's GISS Surface Temperature Analysis has records from the 1880s. As for calibration, I believe some places routinely calibrated their mercury tstats. But since that was a potential issue, we started using indirect measurements (eg: what I mentioned) to confirm certain climate trends.
- pcdoodle 2y agoNOAA's GHCN web portal has "Add to Cart" next to the records. Are there any free climate data regarding ocean temps with a paper trail of the measurements and any "updates" that might have been done over the years?
- abenga 2y agoHere'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.
- pcdoodle 2y agoThank you. "In god we trust but everyone else has to produce the data."