WIT Press

Non-local Turbulent Transport: Pollution Dispersion Aspects Of Coherent Structure Of Connective Flows

Price

Free (open access)

Volume

9

Pages

8

Published

1995

Size

693 kb

Paper DOI

10.2495/AIR950071

Copyright

WIT Press

Author(s)

S. Zilitinkevich

Abstract

During the last forty years vertical exchange in the atmospheric surface layer has been parameterized with the aid of the Monin-Obukhov similarity theory. Currently it is understood that the concept of local flux-gradient correspondence underlying that theory and most traditional turbulence closures breaks down in convective conditions. Physical essence of the problem is as follows. In strong convection large-scale semi-organised coherent structures embrace the entire convective boundary layer (~1 km in height). They generate pronounced large- scale (2-3 km in the horizontal) flow patterns close to the surface, which play an important role in the horizontal dispersion of atmospheric pollutants. The large- scal

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