Dear Alexandra and Peter, what concerns the 18O of Red Sea water we published some data a few years ago: Ganssen, G., and Kroon, D., 1991: Evidence for Red Sea surface circulation from oxygen isotopes of modern surface waters and planktonic foraminiferal tests. Paleoceanography, 6,1, 73-82. Unfortunately the quality of our salinity data did not allow for a regression. A new data set from a 1992 expedition, however does. The relationship is: 18O (V-SMOW) = 0.3056 salinity - 10.774 (r2=0.97, n=23). More details available on request. Kind regards Gerald Ganssen Dr.Gerald Ganssen Institute of Earth Sciences Free University De Boelelaan 1085 1081 HV Amsterdam The Netherlands tel.: 31 20 4447369 (office) 31 20 4447308 (mass-spectrometer lab.) 31 653845009 (private) fax: 31 20 6462457