Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification

D. Pino, J. Vilà-Guerau de Arellano, S.W. Kim

Research output: Contribution to journalArticleAcademicpeer-review

38 Citations (Scopus)

Abstract

Dry convective boundary layers characterized by a significant wind shear on the surface and at the inversion are studied by means of the mixed-layer theory. Two different representations of the entrainment zone, each of which has a different closure of the entrainment heat flux, are considered. The simpler of the two is based on a sharp discontinuity at the inversion (zeroth-order jump), whereas the second one prescribes a finite depth of the inversion zone (first-order jump). Large-eddy simulation data are used to provide the initial conditions for the mixed-layer models, and to verify their results. Two different atmospheric boundary layers with different stratification in the free atmosphere are analyzed. It is shown that, despite the simplicity of the zeroth-order-jump model, it provides similar results to the first-order-jump model and can reproduce the evolution of the mixed-layer variables obtained by the large-eddy simulations in sheared convective boundary layers. The mixed-layer model with both closures compares better with the large-eddy simulation results in the atmospheric boundary layer characterized by a moderate wind shear and a weak temperature inversion. These results can be used to represent the flux of momentum, heat, and other scalars at the entrainment zone in general circulation or chemistry transport models.
Original languageEnglish
Pages (from-to)1224-1243
Number of pages20
JournalJournal of Applied Meteorology and Climatology
Volume45
Issue number9
DOIs
Publication statusPublished - 2006

Keywords

  • entrainment zone
  • wind shear
  • cumulus convection
  • kinetic-energy
  • part ii
  • inversion
  • growth
  • dynamics
  • parameterization
  • budget

Fingerprint Dive into the research topics of 'Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification'. Together they form a unique fingerprint.

  • Cite this