Entrainment Parameterization in Convective Boundary Layers

vanZanten, Margreet C.; Duynkerke, Peter G.; Cuijpers, J. W. M.

doi:10.1175/1520-0469(1999)056<0813:epicbl>2.0.co;2

Cited by 108 publications

(71 citation statements)

References 21 publications

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“…With the zero-order MXL model we repeat the experiments as in the LES and derive expressions for boundary-layer height and inversion-layer strength equilibrium based on Lilly (1968) and Garratt (1992). By using the first-order mixed-layer equations (Betts 1974;Duynkerke et al 1995;Sullivan et al 1998;Van Zanten et al 1999;Pino and Vilà-Guerau de Arellano 2008) we can investigate how the entrainment zone responds to the presence of absorbing aerosols.…”

Section: Model Descriptionmentioning

confidence: 99%

Impacts of Aerosol Shortwave Radiation Absorption on the Dynamics of an Idealized Convective Atmospheric Boundary Layer

Barbaro

Arellano

Krol

et al. 2013

Boundary-Layer Meteorol

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We investigated the impact of aerosol heat absorption on convective atmospheric boundary-layer (CBL) dynamics. Numerical experiments using a large-eddy simulation model enabled us to study the changes in the structure of a dry and shearless CBL in depthequilibrium for different vertical profiles of aerosol heating rates. Our results indicated that aerosol heat absorption decreased the depth of the CBL due to a combination of factors: (i) surface shadowing, reducing the sensible heat flux at the surface and, (ii) the development of a deeper inversion layer, stabilizing the upper CBL depending on the vertical aerosol distribution. Steady-state analytical solutions for CBL depth and potential temperature jump, derived using zero-order mixed-layer theory, agreed well with the large-eddy simulations. An analysis of the entrainment zone heat budget showed that, although the entrainment flux was controlled by the reduction in surface flux, the entrainment zone became deeper and less stably stratified. Therefore, the vertical profile of the aerosol heating rate promoted changes in both the structure and evolution of the CBL. More specifically, when absorbing aerosols were present only at the top of the CBL, we found that stratification at lower levels was the mechanism responsible for a reduction in the vertical velocity and a steeper decay of the turbulent kinetic energy throughout the CBL. The increase in the depth of the inversion layer also modified the potential temperature variance. When aerosols were present we observed that the potential temperature variance became significant already around 0.7z i (where z i is the CBL height) but less intense at the entrainment zone due to the smoother potential temperature vertical gradient.

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Section: Model Descriptionmentioning

confidence: 99%

Impacts of Aerosol Shortwave Radiation Absorption on the Dynamics of an Idealized Convective Atmospheric Boundary Layer

Barbaro

Arellano

Krol

et al. 2013

Boundary-Layer Meteorol

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show abstract

“…Van Zanten et al, 1999) and for sheared CBLs (Pino et al, 2006b;Kim et al, 2006;Conzemius and Fedorovich, 2007). These FOMs feature an explicit representation of the upper EZ-layer.…”

Section: The Equilibrium Entrainment Regime and The Constant Zom-entrmentioning

confidence: 95%

“…Van Zanten et al, 1999), the redistribution term (second term on the rhs in Eq. 2.41) is neglected and ZOM quantities c are approximated by c m .…”

Section: The 0 Th -Order Model (Zom) Approachmentioning

confidence: 99%

“…Deardorff et al, 1969;Fedorovich et al, 2001a,b;Jonker and Jiménez, 2014), LES (e.g. Deardorff, 1974a;Van Zanten et al, 1999;Fedorovich et al, 2004b) and DNS (Garcia and Mellado, 2014)). In typical experimental setups 42 the quasi-stationary equilibrium entrainment regime is reached after a rather short initial period and as a characteristic feature of mature, developed CBLs, it has attracted much attention.…”

Section: The Equilibrium Entrainment Regime and The Constant Zom-entrmentioning

confidence: 99%

“…52 To our knowledge, this holds for all newer and more detailed CBL studies since Van Zanten et al (1999), including all LES studies about sheared CBLs (since Moeng and Sullivan (1994); Kim et al (2003)). In fact the choice of z i as the singular convective length scale is related to a specific interpretation of entrainment, the so-called 'process partitioning' (PP).…”

Section: The Equilibrium Entrainment Regime and The Constant Zom-entrmentioning

confidence: 99%

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Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics

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4. The recent discovery of epigenetic mechanisms has surprised professional biologists more than scientific amateurs.5. The potential impacts on the climate of large scale use of wind-energy gets too little attention.6. To think out of the box is also very useful to get to know the boundaries of the box.7. Various reasons that are supposed to explain the 'Brexit' can ultimately be traced back to the UK's unique geographical situation.8. One does not have to believe in 'Free Will' to have ethical values, to experience a moral impetus or to feel a desire for the Good.Propositions belonging to the thesis, entitled ´Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics'Joel Schröter

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Analysis Study on Convective Boundy Layer Eddy Structure in Water Tank by Orthonormal Wavelet

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Sun

Yuan

et al. 2004

Chinese J of Geophysics

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Using orthonormal wavelet transform, We made analysis of experimental data of convective boundary layer turbulence in water tank, including multi-scale decomposition and high frequency noise removing. Spectrum analyses show that turbulence in mixed layer is very different from that in entrainment zone. This difference may be caused by various characteristics of large scale element in turbulence. While the small scale turbulence in both mixed layer and entrainment zone are similar, which are homogeneous and their spectra are satisfied with Kolmogorov's scaling law with -5/3 exponent.

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Entrainment Parameterization in Convective Boundary Layers

Cited by 108 publications

References 21 publications

Impacts of Aerosol Shortwave Radiation Absorption on the Dynamics of an Idealized Convective Atmospheric Boundary Layer

Impacts of Aerosol Shortwave Radiation Absorption on the Dynamics of an Idealized Convective Atmospheric Boundary Layer

Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics

Analysis Study on Convective Boundy Layer Eddy Structure in Water Tank by Orthonormal Wavelet

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