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An improved Mellor-Yamada level-3 model with condensation physics: Its design and verification

NAKANISHI, Mikio ; NIINO, Hiroshi

Boundary-layer meteorology, 2004-07, Vol.112 (1), p.1-31 [Periódico revisado por pares]

Dordrecht: Springer

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  • Título:
    An improved Mellor-Yamada level-3 model with condensation physics: Its design and verification
  • Autor: NAKANISHI, Mikio ; NIINO, Hiroshi
  • Assuntos: Boundaries ; Computation ; Computational fluid dynamics ; Condensing ; Constants ; Convection, turbulence, diffusion. Boundary layer structure and dynamics ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Fog ; Kinetic energy ; Mathematical models ; Meteorology ; Turbulence
  • É parte de: Boundary-layer meteorology, 2004-07, Vol.112 (1), p.1-31
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: A computational scheme for an improved Mellor-Yamada(M-Y) Level-3 model with condensation physics is proposedand its performance is examined against large-eddy-simulationdata on radiation fog. The improved M-Y model greatlycorrects several shortcomings of the original M-Y model:the underestimations of the mixed-layer depth and themagnitude of turbulent kinetic energy, and the discrepanciesin the formation and dissipation times of the fog. Inaddition the improved M-Y model can reproduce theoccurrence of Kelvin-Helmholtz instability and periodicoscillations due to its energy cycle. It is shown that theoptimization of both the closure constants and the masterlength scale is required for this improvement. The improved M-Y model has an improvement also in theLevel-2.5 version. Although the performance of theLevel-2.5 version is not so good as that of the Level-3version, the former has the advantage of relatively lowcomputational cost and is popularly used in operationalweather forecasts. Our computational scheme for theimproved M-Y model allows us to switch its hierarchylevels easily according to the purpose.
  • Editor: Dordrecht: Springer
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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