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We discuss a new phenomenon of turbulent thermal diffusion associated withturbulent transport of aerosols in the atmosphere and in laboratoryexperiments. The essence of this phenomenon is the appearance of a nondiffusivemean flux of particles in the direction of the mean heat flux, which results inthe formation of large-scale inhomogeneities in the spatial distribution ofaerosols that accumulate in regions of minimum mean temperature of thesurrounding fluid. This effect of turbulent thermal diffusion was detectedexperimentally. In experiments turbulence was generated by two oscillatinggrids in two directions of the imposed vertical mean temperature gradient. Weused Particle Image Velocimetry to determine the turbulent velocity field, andan Image Processing Technique based on an analysis of the intensity of Miescattering to determine the spatial distribution of aerosols. Analysis of theintensity of laser light Mie scattering by aerosols showed that aerosolsaccumulate in the vicinity of the minimum mean temperature due to the effect ofturbulent thermal diffusion. Geophysical applications of the obtained resultsare discussed.

Turbulent thermal diffusion of aerosols in geophysics and in laboratory experiments