Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification
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.
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Format: | Article/Letter to editor biblioteca |
Language: | English |
Subjects: | budget, cumulus convection, dynamics, entrainment zone, growth, inversion, kinetic-energy, parameterization, part ii, wind shear, |
Online Access: | https://research.wur.nl/en/publications/representing-sheared-convective-boundary-layer-by-zeroth-and-firs |
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dig-wur-nl-wurpubs-3489472024-06-25 Pino, D. Vilà-Guerau de Arellano, J. Kim, S.W. Article/Letter to editor Journal of Applied Meteorology and Climatology 45 (2006) 9 ISSN: 1558-8424 Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification 2006 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. en application/pdf https://research.wur.nl/en/publications/representing-sheared-convective-boundary-layer-by-zeroth-and-firs 10.1175/JAM2396.1 https://edepot.wur.nl/18327 budget cumulus convection dynamics entrainment zone growth inversion kinetic-energy parameterization part ii wind shear Wageningen University & Research |
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budget cumulus convection dynamics entrainment zone growth inversion kinetic-energy parameterization part ii wind shear budget cumulus convection dynamics entrainment zone growth inversion kinetic-energy parameterization part ii wind shear |
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budget cumulus convection dynamics entrainment zone growth inversion kinetic-energy parameterization part ii wind shear budget cumulus convection dynamics entrainment zone growth inversion kinetic-energy parameterization part ii wind shear Pino, D. Vilà-Guerau de Arellano, J. Kim, S.W. Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification |
description |
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. |
format |
Article/Letter to editor |
topic_facet |
budget cumulus convection dynamics entrainment zone growth inversion kinetic-energy parameterization part ii wind shear |
author |
Pino, D. Vilà-Guerau de Arellano, J. Kim, S.W. |
author_facet |
Pino, D. Vilà-Guerau de Arellano, J. Kim, S.W. |
author_sort |
Pino, D. |
title |
Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification |
title_short |
Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification |
title_full |
Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification |
title_fullStr |
Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification |
title_full_unstemmed |
Representing Sheared Convective Boundary Layer by Zeroth- and First-Order-Jump Mixed-Layer Models: Large-Eddy Simulation Verification |
title_sort |
representing sheared convective boundary layer by zeroth- and first-order-jump mixed-layer models: large-eddy simulation verification |
url |
https://research.wur.nl/en/publications/representing-sheared-convective-boundary-layer-by-zeroth-and-firs |
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