A Model for Describing the Evolution of the Energy Density Spectrum in the Convective Boundary Layer Growth
The literature regarding the Convective Boundary Layer (CBL) at early morning transition is scarce. Most papers are focused on the growth after convection is fully established. Tennekes (1973) proposes a conceptual model for the time required to erode the nocturnal inversion, while Kaimal et al. (1976) show a ‘typical’ diurnal cycle of surface heat flux and Convective Boundary Layer depth, but this begins after the surface heat flux is already positive. Wyngaard (1983) discusses the morning (‘neutral-convective’) transition briefly, and makes the point that only a relatively small buoyancy flux is needed to cause the transition. In this work, starting from the spectral form of the turbulent energy equation, a model for the CBL growing is described.
KeywordsTurbulent Kinetic Energy Diurnal Cycle Surface Heat Flux Convective Boundary Layer Spectral Form
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