Global meteoric water line
- Global meteoric water line
The Global Meteoric Water Line is an equation defined by the geochemist Harmon Craig [cite journal|journal=Scripps News|url=http://scrippsnews.ucsd.edu/Releases/?releaseID=550|date=18 March 2003|title="Obituary notice: pioneer of geochemistry: Harmon Craig"] [cite journal|journal=Biographical Memoirs of the National Academy of Sciences|location=Washington, DC|title=Harmon Craig 1926-2003|date=2006|author=Karl Turekian|url=http://books.nap.edu/html/biomems/hcraig.pdf|pages=pp. 1–14] that states the average relationship between hydrogen and oxygen isotope ratios in natural terrestrial waters, expressed as a worldwide average. 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 percentages to vary between localities within that area [cite web|title=SAHRA Glossary of Terms|url=http://www.sahra.arizona.edu/programs/isotopes/glossary/index.html] . 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"' [cite journal|journal=Science|title=Isotopic variations in meteoric waters|volume=133|issue=3465|pages=pp. 1702–1703|date=26 May 1961|author=Harmon Craig|url=http://www.sciencemag.org/cgi/content/abstract/133/3465/1702|doi=10.1126/science.133.3465.1702] .
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