Small-scale random fluctuations of atmospheric variables are ubiquitous dynamical
components in the stable, free atmosphere. There, within the O (1–10 m) vertical wavelength …

This study is an experimental investigation of the probability density function (pdf) and the
fine structure of temperature fluctuations in uniformly sheared turbulence with a passively …

We quantify the temporal development of the mixing field of a starting jet by measuring the
mixture fraction and the scalar dissipation rate and their statistics in an isothermal …

Statistical diagnostics of mixing and transport are computed for a numerical model of forced
shallow-water flow on the sphere and a middle-atmosphere general circulation model. In …

The statistics of tracer variability on small scales (< 200 km) is investigated using high
resolution aircraft measurements of ozone in the northern winter middle/high latitudes …

Two conditional averages for the longitudinal velocity increment ur are considered: h (ur) is
the average of the difference of the Laplacian of the velocity field with the ur value fixed …

We study the equilibrium statistics of an idealized model of random advection. Theoretical
results for large-scale homogeneous forcing—notably the shapes of the PDFs—are …

The conditional dissipation and diffusion for a passive scalar with an imposed mean
gradient are studied here. The results are obtained for an elementary model consisting of a …

We study the effects of a large-scale mean circulating flow on passive scalar statistics in
turbulent advection using a two-dimensional lattice model. The incompressible advecting …

We use a two-dimensional lattice model to study the intermittency problem of a passive
scalar advected by a velocity field of finite correlation time. The stream function generating …