A new parameterization for shallow cumulus convection and its application to marine subtropical cloud-topped boundary layers. Part I: Description and 1D results
A new parameterization of shallow cumulus convection is presented. The parameterization consists of a mass flux scheme based on a buoyancy-sorting, entrainment-detrainment plume model. The mass flux scheme is coupled to a 1.5-order turbulence closure model with an entrainment closure for convective...
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| Veröffentlicht in: | Monthly weather review 2004-04, Vol.132 (4), p.864-882 |
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| creator | BRETHERTON, Christopher S MCCAA, James R GRENIER, Hervé |
| description | A new parameterization of shallow cumulus convection is presented. The parameterization consists of a mass flux scheme based on a buoyancy-sorting, entrainment-detrainment plume model. The mass flux scheme is coupled to a 1.5-order turbulence closure model with an entrainment closure for convective boundary layers. Model performance is verified using single-column-model simulations at relatively high vertical resolution of pure trade-cumulus convection and a cumulus to stratocumulus transition. Mixing rates, cloud cover, and vertical flux profiles, as deduced from previously published large-eddy simulation studies, are well reproduced by the parameterization. The model is used to demonstrate that height variations of lateral mixing rates can be successfully captured by a simple implementation of a buoyancy-sorting mechanism in the updraft cloud model. A companion paper describes the implementation of the scheme in a mesoscale model. [PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1175/1520-0493(2004)132<0864:anpfsc>2.0.co;2 |
| format | Article |
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Part I: Description and 1D results</title><source>American Meteorological Society</source><source>Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals</source><source>Alma/SFX Local Collection</source><creator>BRETHERTON, Christopher S ; MCCAA, James R ; GRENIER, Hervé</creator><creatorcontrib>BRETHERTON, Christopher S ; MCCAA, James R ; GRENIER, Hervé</creatorcontrib><description>A new parameterization of shallow cumulus convection is presented. The parameterization consists of a mass flux scheme based on a buoyancy-sorting, entrainment-detrainment plume model. The mass flux scheme is coupled to a 1.5-order turbulence closure model with an entrainment closure for convective boundary layers. Model performance is verified using single-column-model simulations at relatively high vertical resolution of pure trade-cumulus convection and a cumulus to stratocumulus transition. Mixing rates, cloud cover, and vertical flux profiles, as deduced from previously published large-eddy simulation studies, are well reproduced by the parameterization. The model is used to demonstrate that height variations of lateral mixing rates can be successfully captured by a simple implementation of a buoyancy-sorting mechanism in the updraft cloud model. A companion paper describes the implementation of the scheme in a mesoscale model. 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A companion paper describes the implementation of the scheme in a mesoscale model. 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| source | American Meteorological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Boundary layers Buoyancy Cloud cover Clouds Convection Earth, ocean, space Entrainment Exact sciences and technology External geophysics Fluctuations Marine Meteorology |
| title | A new parameterization for shallow cumulus convection and its application to marine subtropical cloud-topped boundary layers. Part I: Description and 1D results |
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