VERTICAL STRUCTURE OF SECOND-MOMENT TURBULENT VARIABLES

Two kinds of observational data,fluctuation and mean profile measurements,from a 325 mmeteorological tower in Beijing,China,are used to evaluate local scales of velocity andtemperature for higher heights by flux-gradient mean profiles and eddy-correlation techniques.Acomparison of these methods each other was made in terms of vertical turbulence fluxes formomentum and beat at the same heigbt.The vertical profiles of non-dimensional second moments.such as vertical turbulent fluxes of momentum and heat.velocity and temperature standarddeviations,were derived by local similarity theory.The local similarity relations expressed that thevertical distributions of non-dimensional second moment variables were found to be functions ofz/Λ and z/h in the stable boundary layer and the function of z/Z_i for the convective boundarylayer,where A the local Monin Obukhov(M-O)length.h the height of stable boundary layer andZ_i the height of mixed-layer.These relations are shown to agree well with the observational data.

VERTICAL STRUCTURE OF SECOND-MOMENT TURBULENT VARIABLES