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A Density Current Parameterization Coupled with Emanuel’s Convection Scheme. Part II: 1D Simulations

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  • 1 Laboratoire de Météorologie Dynamique, Paris, France
  • 2 CNRM-GAME, Météo-France, and CNRS, Toulouse, France
  • 3 Laboratoire de Météorologie Dynamique, Paris, France
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Abstract

The density current parameterization coupled with Emanuel’s convection scheme, described in of this series of papers, is tested in a single-column framework for continental and maritime convective systems. The case definitions and reference simulations are provided by cloud-resolving models (CRMs). For both cases, the wake scheme yields cold pools with temperature and humidity differences relative to the environment in reasonable agreement with observations (with wake depth on the order of 2 km over land and 1 km over ocean). The coupling with the convection scheme yields convective heating, drying, and precipitation similar to those simulated by the CRM. Thus, the representation of the action of the wakes on convection in terms of available lifting energy (ALE) and available lifting power (ALP) appears satisfactory. The sensitivity of the wake–convection system to the basic parameters of the parameterization is widely explored. A range of values for each parameter is recommended to help with implementing the scheme in a full-fledged general circulation model.

Corresponding author address: J.-Y. Grandpeix, Laboratoire de Météorologie Dynamique, Boite 99, 4, Place Jussieu, F-75252, Paris CEDEX 05, France. Email: jyg@lmd.jussieu.fr

Abstract

The density current parameterization coupled with Emanuel’s convection scheme, described in of this series of papers, is tested in a single-column framework for continental and maritime convective systems. The case definitions and reference simulations are provided by cloud-resolving models (CRMs). For both cases, the wake scheme yields cold pools with temperature and humidity differences relative to the environment in reasonable agreement with observations (with wake depth on the order of 2 km over land and 1 km over ocean). The coupling with the convection scheme yields convective heating, drying, and precipitation similar to those simulated by the CRM. Thus, the representation of the action of the wakes on convection in terms of available lifting energy (ALE) and available lifting power (ALP) appears satisfactory. The sensitivity of the wake–convection system to the basic parameters of the parameterization is widely explored. A range of values for each parameter is recommended to help with implementing the scheme in a full-fledged general circulation model.

Corresponding author address: J.-Y. Grandpeix, Laboratoire de Météorologie Dynamique, Boite 99, 4, Place Jussieu, F-75252, Paris CEDEX 05, France. Email: jyg@lmd.jussieu.fr

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