[Aspects microphysiques et électriques d'un modèle explicite de nuage : description et étude d'un orage académique]
Un schéma d'électrisation, cohérent avec la paramétrisation microphysique en phase mixte, a été développé pour le modèle numérique de nuage MésoNH. Il y a quatre étapes successives : (i) la séparation de charges est supposée résulter uniquement des processus non-inductifs ; (ii) les charges électriques emportées par les différents types d'hydrométéores sont transportées par le flux atmosphérique et redistribuées par les processus microphysiques ; (iii) le champ électrique est déduit de l'intégration d'une équation de Poisson modifiée ; (iv) une paramétrisation des éclairs simule le déclenchement, la propagation et les branchements pseudo-fractals des décharges et les neutralisations de charge associées. Deux expériences numériques sont conduites, d'abord pour évaluer les performances du schéma d'éclairs, ensuite pour tester l'évolution simulés des caractéristiques électriques d'un orage supercellulaire idéalisé.
An electrification scheme, consistent with the mixed-phase microphysical parameterization, has been developed for the French cloud resolving model MésoNH. There are four successive steps: (i) charge separation is assumed to result only from non-inductive processes; (ii) electrical charges carried by the different hydrometeor species are transported along the air flow and redistributed according to the microphysical processes; (iii) the electric field is deduced from the integration of a modified Poisson equation; (iv) a lightning parameterization simulates triggering, propagation and pseudo-fractal branching of the flashes and associated charge neutralization. Two numerical experiments are conducted firstly to evaluate the performances of the lightning scheme, secondly to test the simulated evolution of the electrical characteristics of a idealized supercellular storm.
Mot clés : modélisation numérique, nuages convectifs, électrisation des nuages, paramétrisation des éclairs
Gilles Molinié 1 ; Jean-Pierre Pinty 1 ; Frank Roux 1
@article{CRPHYS_2002__3_10_1305_0,
author = {Gilles Molini\'e and Jean-Pierre Pinty and Frank Roux},
title = {Some microphysical and electrical aspects of a {Cloud} {Resolving} {Model:} description and thunderstorm case study},
journal = {Comptes Rendus. Physique},
pages = {1305--1324},
publisher = {Elsevier},
volume = {3},
number = {10},
year = {2002},
doi = {10.1016/S1631-0705(02)01409-3},
language = {en},
}
TY - JOUR AU - Gilles Molinié AU - Jean-Pierre Pinty AU - Frank Roux TI - Some microphysical and electrical aspects of a Cloud Resolving Model: description and thunderstorm case study JO - Comptes Rendus. Physique PY - 2002 SP - 1305 EP - 1324 VL - 3 IS - 10 PB - Elsevier DO - 10.1016/S1631-0705(02)01409-3 LA - en ID - CRPHYS_2002__3_10_1305_0 ER -
%0 Journal Article %A Gilles Molinié %A Jean-Pierre Pinty %A Frank Roux %T Some microphysical and electrical aspects of a Cloud Resolving Model: description and thunderstorm case study %J Comptes Rendus. Physique %D 2002 %P 1305-1324 %V 3 %N 10 %I Elsevier %R 10.1016/S1631-0705(02)01409-3 %G en %F CRPHYS_2002__3_10_1305_0
Gilles Molinié; Jean-Pierre Pinty; Frank Roux. Some microphysical and electrical aspects of a Cloud Resolving Model: description and thunderstorm case study. Comptes Rendus. Physique, Volume 3 (2002) no. 10, pp. 1305-1324. doi : 10.1016/S1631-0705(02)01409-3. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/S1631-0705(02)01409-3/
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