J. C. Wyngaard

Structure of the PBL

Even the most casual observer notices the changes in the wind. Though it has a certain persistence in time, the details of its swirls and eddies seem infinitely variable. Its st...

Top-Down and Bottom-Up Diffusion of a Scalar in the Convective Boundary Layer

The vertical diffusion of a passive conservative scalar through the convective PBL is actually the superposition of what we call “top-down” and “bottom up” processes. These comp...

An evaluation of neutral and convective planetary boundary-layer parameterizations relative to large eddy simulations

Flux-Profile Relationships in the Atmospheric Surface Layer

Wind and temperature profiles for a wide range of stability conditions have been analyzed in the context of Monin-Obukhov similarity theory. Direct measurements of heat and mome...

The turbulence kinetic energy budget in convective conditions

Abstract Data from the 1973 Minnesota atmospheric boundary layer experiment are used to investigate details of the turbulence kinetic energy budget in convective conditions. Sur...