Shallow cumulus rain drop evaporation and isotope model notebooks

Julia functions model the thermodynamics,
raindrop microphysics, and stable water isotope physics to
predict the size and isotope concentration of raindrops as
they fall from cloud base.
The model implements a version of the Stewart (1975)
and Craig and Gordon (1965) equations for flux of
the isotope ratio from evaporating rain drops.
Simulations are performed for rain drop size
distributions and water vapor observed
below shallow cumulus clouds (Sarkar et al. 2023), and
for idealized experiments illustrating the roles of
environmental exchange and distillation by
equilibrium and diffusive fractionation.
Improved numerics allow for finely resolving the effect
of differential diffusion of isotopes especially as
drops near complete evaporation.