Fractionnement isotopique lors des changements d’état solide-vapeur et liquide-vapeur de l’eau à des températures inférieures à 0°C
Abstract
Measurements of the hydrogen isotopic composition of water in atmospheric precipitations make possible the study of their formation and evolution, since deuterium is a natural tracer for the water molecule.
In a hydrologic cycle, each change of state is accompanied by an isotopic fractionation expressed in terms of a factor α, which is a function of temperature. This fractionation is due to differences in the physical properties of the molecules H2O and HDO.
In the work described in this paper we have measured α between −40°C and 0°C for the phase equilibrium ice-water vapor and between −15°C and 0°C for the equilibrium liquid-water vapor.
The values obtained may be expressed in the relations
log αsolide-vapeur = −4.10 · 10−2 + 7.074/T2,
log αliquide-vapeur = −4.34 · 10−2 + 6.520/T2.
© 1967 L. Merlivat, G. Nief, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.