Boundary-Layer Meteorology

, Volume 104, Issue 3, pp 359–369

Evaluating Models Of The Neutral, Barotropic Planetary Boundary Layer Using Integral Measures: Part Ii. Modelling Observed Conditions

  • G. D. Hess
  • J. R. Garratt
Article

Abstract

The steady-state, horizontally homogeneous, neutral, barotropiccase forms the foundation of our theoretical understanding of the planetary boundary layer (PBL).While simple analytical models and first-order closure models simulate atmospheric observationsof this case well, more sophisticated models, in general, do not. In this paperwe examine how well three higher-order closure models, E - ∈ - l, E - l, and LRR - l,which have been especially modified for PBL applications, perform in predicting the behaviour of thecross-isobaric angle α0, the geostrophic drag coefficient Cg, and the integral of the dissipationrate over the boundary layer, as a function of the surface Rossby number Ro. For comparison we alsoexamine the performance of three first-order closure mixing-length models, two proposed byA. K. Blackadar and one by H. H. Lettau, and the performance of the standard model forsecond-order closure and a modification of it designed to reduce the overprediction of turbulence inthe upper part of the boundary layer.

First-order turbulent closure Higher-order turbulent closure Mixing-length models Neutral barotropic planetary boundary layer Rossby number similarity theory 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • G. D. Hess
    • 1
  • J. R. Garratt
    • 2
  1. 1.Bureau of Meteorology Research CentreMelbourneAustralia
  2. 2.CSIRO Atmospheric ResearchAspendaleAustralia

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