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I looked up some of the original publications by Harmon Craig. There are a ton of them, and they are very highly cited. For example, in Isotopic exchange effects in the evaporation of water: 1. Low-temperature experimental results (Journal of Geophysical Research, 1963 - DOI 10.1029/JZ068i017p05079) the abstract states: The deuterium and oxygen 18 ...


1

The water in the Oceans is partly 1) the original water from their formation and this will have come into equilibrium with the underlying strata of earth. These strongly depend on location for the chemicals composing them and this will apply to the isotopes in these chemicals 2) Rain water which brings down whatever dust exists in the atmosphere, and ...


4

I guess the isotopic composition of seawater depends on temperature, among other things, as water comprising lighter isotopes evaporates more easily.



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