LOCAL SIMILARITY THEORY AND UNIVERSAL PROFILES OF TURBULENT CHARACTERISTICS IN THE CONVECTIVE BOUNDARY LAYER

A. N. Vul'fson, I. A. Volodin, and O. O. Borodin

The description of an unstable layer of turbulent atmospheric convection over a horizontally uniform heat source under weak wind conditions is considered. In the framework of dimension theory, it is shown that the mean characteristics of the boundary layer can be expressed through the height and local convective heat flux at a given level. The convective heat flux profile is assumed to vary linearly with height. It is shown that, up to the third moments, the calculations based on the proposed theory of turbulent characteristics agree well with observational data in the lower part of the unstable convective layer, whose thickness is roughly four times the Monin—Oboukhov surface layer depth. Theoretical profiles of the moments of a passive admixture coming to the atmosphere from the underlying surface are constructed.

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