Global meteoric water line

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The Global Meteoric Water Line is an equation defined by the geochemist Harmon Craig [1] [2] that states the average relationship between hydrogen and oxygen isotope ratios in natural terrestrial waters, expressed as a worldwide average.

\delta\mathrm D = 8.0\cdot\delta^{18}\mathrm O + 10{}^{0\!}\!/\!_{00}

A meteoric water line can also be calculated for a given area, and used as a baseline within that area. Kinetic fractionation will cause the isotope ratios to vary between localities within that area.[3] This relationship is used within the field of isotope hydrology. Craig's original assertion is that the isotopic enrichments, relative to ocean water, display a linear correlation over the entire range for waters which have not undergone excessive evaporation'.[4]

References

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