An Analytical Method to Evaluate Mixing Length Scales for the Planetary Boundary Layer

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  • a Universidade Federal de Santa Maria, Departamento Fisica da Santa Maria, Brazil
  • | b Departamento de Ciências Atmosféricas, IAG-USP, Sao Pau1o, Brazil
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Abstract

An analytical method to evaluate the Lagrangian length scales for a turbulent planetary boundary layer (PBL) under stable and convective conditions is described in this paper. The method is based on the Taylor's diffusion theory. Agreement with the mixing lengths found in the literature indicates that the hypothesis of using Lagrangian length scale as a surrogate for mixing length scale in the turbulent PBL is valid.

Abstract

An analytical method to evaluate the Lagrangian length scales for a turbulent planetary boundary layer (PBL) under stable and convective conditions is described in this paper. The method is based on the Taylor's diffusion theory. Agreement with the mixing lengths found in the literature indicates that the hypothesis of using Lagrangian length scale as a surrogate for mixing length scale in the turbulent PBL is valid.

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