Dispersion in the planetary boundary layer (PBL) is controlled by the mean and turbulent structure of that layer. In the past decade, significant progress has occurred in our understanding of PBL structure and diffusion, especially for the daytime convective boundary layer (CBL). As discussed in Ch. 1, this has resulted from the collective efforts of numerical modeling, laboratory simulations, and field observations. In this chapter I discuss how this better understanding has improved the theoretical basis and performance of dispersion models for routine applications. I shall focus on point sources of nonbuoyant (i.e., passive) or buoyant material at arbitrary height in the CBL. The CBL is especially important in the case of tall stacks because they generally contribute their maximum ground-level concentrations (GLC) during convection (see Venkatram, 1980; Weil and Brower, 1984).
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- Dispersion in the Convective Boundary Layer
Jeffrey C. Weil
- American Meteorological Society
- Chapter 4
Systemische Notwendigkeit zur Weiterentwicklung von Hybridnetzen