d18O_evap_isotope_frac: Equilibrium Isotope Fractionation Factor

In cvoter/isoH2Obudget: Lake Water Budget Using Stable Isotopes

Description

Calculates the equilibrium isotope fractionation factor at the temperature of the air-water interface based on Eq. 16a in Gibson et al. (2016) or Eq. 1.6 in Mook (2000). Returns this value as the ratio in liquid vs. the ratio in vapor (i.e., LV form, alpha > 1). Gibson et al. refer to this formulation as alpha+ and to the VL form (i.e., alpha < 1) as alpha*. Krabbenhoft et al. (1990) use alpha* (i.e, VL form, alpha < 1) in their equations.

Usage

d18O_evap_isotope_frac(ltmp, method = "Gibson")

Arguments

ltmp	lake surface temperature (K)
method	equation to use, defaults to "Gibson" but can also be "Mook".

Value

alpha (-), the equilibrium isotope fractionation factor in LV form (i.e., alpha > 1)

References

Gibson, J.J., S.J. Birks, and Y. Yi. 2016. Stable isotope mass balance of lakes: a contemporary perspective. Quaternary Science Reviews, 131:316-328. https://doi.org/10.1016/j.quascirev.2015.04.013

Mook, W.G. (ed.) 2000. Environmental Isotopes in the Hydrologic Cycle: Volume III: Surface Water. UNESCO. Paris, France.

Krabbenhoft, D. P., C. J. Bowser, M. P. Anderson, and J. W. Valley. (1990). Estimating Groundwater Exchange with Lakes: 1. The Stable Isotope Mass Balance Method. Water Resources Research, 26(10):2445-2453. https://doi.org/10.1029/WR026i010p02445

cvoter/isoH2Obudget documentation built on March 29, 2020, 11:07 a.m.