Global meteoric water line (GMWL)
Definition
The linear relationship δ2H = 8 × δ18O + 10 that describes the global co-variation of O and H isotopes in precipitation. Used as a reference to identify evaporative enrichment in samples that fall below the line.
Related terms
- δ18O (delta-18-O)
- The ratio of oxygen-18 to oxygen-16 in a sample expressed in per-mil deviation from the Vienna Standard Mean Ocean Water (VSMOW) standard....
- δ2H (delta deuterium)
- The ratio of deuterium to hydrogen in a sample expressed in per-mil deviation from VSMOW. Covaries with δ18O along the global meteoric...
- Isoscape
- A map of isotope ratio variation across a geographic area, derived from systematic sampling of soil, water, plant, or mineral material; used...
- OIPC (Online Isotopes in Precipitation Calculator)
- A web-based tool and database compiling the IAEA GNIP station network data and providing interpolated δ18O and δ2H predictions for any geographic...
- Tissue-specific incorporation
- The principle that different tissues record isotope signals over different time windows: enamel permanently records childhood; hair records month-by-month recent history; bone...
Explained in
- Oxygen and Hydrogen IsoscapesThe linear relationship δ2H = 8 × δ18O + 10 that describes the global co-variation of O and H isotopes in precipitation. Used as a reference to identify evapor...