Publication | Open Access
A One-Dimensional Entraining/Detraining Plume Model and Its Application in Convective Parameterization
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1990
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AeroacousticsEngineeringFluid MechanicsClimate ModelingAtmospheric ModelGeophysical FlowBoundary LayerEarth ScienceNumerical Weather PredictionAtmospheric ScienceMicrometeorologyEnvironmental EntrainmentNumerical SimulationAtmospheric ModelingHydrodynamic StabilityClimate ChangeHydrometeorologyMeteorologyCloud DynamicUpdraft Moisture DetrainmentRadiation MeasurementCloud ModelCloud PhysicMultiphase FlowClimate DynamicsClimatologyAerospace EngineeringTurbulence ModelingMeteorological ForcingAerodynamicsConvective Parameterization
The model uniquely represents environmental entrainment and updraft detrainment rates. The study introduces a new one‑dimensional cloud model designed for mesoscale convective parameterization schemes. The model modulates two‑way mass exchange between clouds and the environment at each vertical level via a buoyancy‑sorting interface, and its sensitivities to environmental CAPE, vertical moisture, and key control parameters are demonstrated. The scheme produces physically realistic, environment‑responsive vertical profiles of updraft moisture detrainment, mass flux, heating, and drying, and its performance in the Fritsch–Chappell CPS demonstrates improved responsiveness to environmental conditions compared to traditional plume models.
A new one-dimensional cloud model, specifically designed for application in mesoscale convective parameterization schemes (CPSs), is introduced. The model is unique in its representation of environmental entrainment and updraft detrainment rates. In particular, the two-way exchange of mass between clouds and their environment is modulated at each vertical level by a buoyancy sorting mechanism at the interface of clear and cloudy air. The new entrainment/detrainment scheme allows vertical profiles of both updraft moisture detrainment and updraft vertical mass flux to vary in a physically realistic way as a function of the cloud-scale environment. These performance characteristics allow the parameterized vertical distribution of convective heating and drying to be much more responsive to environmental conditions than is possible with a traditional one-dimensional entraining plume model. The sensitivities of the new model to variations in environmental convective available potential energy and vertical moisture distribution in idealized convective environments are demonstrated and its sensitivities to several key control parameters are examined. Finally, the performance of the new model in the Fritsch–Chappell CPS is evaluated. Parameterized heating and drying profiles are elucidated as they relate to the convective environment and to the type of cloud model used in the CPS.