Equilibrium oxygen- and hydrogen-isotope fractionation between ice and water
- Resource Type
- Authors
- M. Lehmann; U. Siegenthaler
- Source
- Journal of Glaciology. 37:23-26
- Subject
- geography
Water mass
geography.geographical_feature_category
Hydrogen
010504 meteorology & atmospheric sciences
530 Physics
Analytical chemistry
chemistry.chemical_element
Mineralogy
Fractionation
010502 geochemistry & geophysics
01 natural sciences
Equilibrium fractionation
chemistry
Deuterium
Sea ice
Seawater
Precipitation
Geology
0105 earth and related environmental sciences
Earth-Surface Processes
- Language
- ISSN
- 1727-5652
0022-1430
We have performed high-precision measurements of the isotope-fractionation factors between ice and water. Ice was grown from a stirred water mass on a cooling plate. The freezing velocity was varied, keeping the stirring rate of the water constant, so that the equilibrium fractionation factors could be determined by extrapolating to zero freezing velocity. The resulting values are∝ (18O/16O) = 1.00291 ± 0.00003 and∝ (D/H) = 1.0212 ± 0.0004.Non-equilibrium freezing of lake and sea ice is briefly discussed as well as the significance of our results for the deuterium excess in polar precipitation.