[Source: NASA/GISS, http://data.giss.nasa.gov/o18data/
Global Seawater Oxygen-18 Database
This database is a collection of over 22,000 seawater O-18 values made since about 1950. We hope that other researchers can benefit from the not-inconsiderable pain it took to collect, verify and put together all these different sources.
This is a amalgamation of ... independent efforts by Gavin Schmidt, Grant Bigg and Eelco Rohling which combines our separately evolved interests. Partial versions of this databases appeared in Schmidt (1999) and Bigg and Rohling (2000). These publications can (should!) be referenced, but references to the whole database (currently version 1.18) should include the web address as follows:
Schmidt, G.A., G. R. Bigg and E. J. Rohling. 1999. "Global Seawater Oxygen-18 Database". http://data.giss.nasa.gov/o18data/
Since this data comes from different laboratories, different standards have been used and it is not always possible to make everything consistent. If you find that strange phenomena occur across different data sets, please don't blame us! Make sure to read the notes that go along with each reference, and try and go back to the original articles (where possible) for clarification. If there are still unresolved issues, please let us know and we will try to investigate. If you know of more pertinent data that could usefully be included here, please let us know and it will happen. Nominally all delta values are with respect to V-SMOW. Published values that used an older standard (original SMOW or PDB) have been corrected (and there is a note in the data reflecting this).
Note added 27 Dec 2006: Temperature measurements can be in-situ or potential temperature (theta). If this matters for you, please check with the original reference.