  We present models for single-particle dispersion in vertical and horizontal
directions of stably stratified flows. The model in the vertical direction is
based on the observed Lagrangian spectrum of the vertical velocity, while the
model in the horizontal direction is a combination of a continuous-time
eddy-constrained random walk process with a contribution to transport from
horizontal winds. Transport at times larger than the Lagrangian turnover time
is not universal and dependent on these winds. The models yield results in good
agreement with direct numerical simulations of stratified turbulence, for which
single-particle dispersion differs from the well studied case of homogeneous
and isotropic turbulence.
