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Article Dans Une Revue Quarterly Journal of the Royal Meteorological Society Année : 2005

A generalization of CAPE into potential energy convertibility

Résumé

The concept of the potential-energy convertibility (PEC) is proposed as a generalization of convective available potential energy (CAPE). It is defined as a vertical integral of buoyancy weighted by a non-dimensional normalized vertical momentum. This is a measure of convertibility of potential energy into kinetic energy in the sense that the actual conversion rate is recovered when PEC evaluated by the convective-scale local buoyancy and vertical momentum, as available from cloud-resolving model (CRM) simulations, is multiplied by the normalization factor for the vertical momentum. It reduces to CAPE, when the standard parcel-lifted buoyancy and a unit value for the normalized vertical momentum are used. It is equivalent to Arakawas–Schubert's cloud work function, when the buoyancy and the vertical momentum profile for an entraining plume are used. PEC evaluated from locally defined buoyancy and vertical momentum in CRM simulations correlates better with the convective precipitation than CAPE. The evaluation of PEC within a convective parametrization may be possible with an appropriate definition of the effective entrainment rate, for example, which is expected to improve CAPE-based convective parametrizations.
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hal-00068827 , version 1 (12-08-2021)

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Jun-Ichi Yano, Jean-Pierre Chaboureau, Françoise Guichard. A generalization of CAPE into potential energy convertibility. Quarterly Journal of the Royal Meteorological Society, 2005, 131 (607), pp.861-876. ⟨10.1256/qj.03.188⟩. ⟨hal-00068827⟩
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