Skip to Main content Skip to Navigation
New interface
Theses

Etude de l'activité électrique des systèmes orageux à l'aide du modèle Méso-NH

Christelle Barthe 1 
1 Équipe Cyclones
LAERO - Laboratoire d'aérologie
Abstract : The electrical scheme of Méso-NH consists of three parts: the electric charge evolution, the electric field computation and the lightning flashes. The non-inductive process is the main mechanism to electrify the cloud. The inductive mechanism becomes efficient when there is an intense electric field in the cloud. When the electric field in the cloud is higher than a threshold value, a lightning flash is triggered and propagates following a bidirectional leader. Branches are generated with a stochastic algorithm and they obey a fractal law deduced from dielectric breakdown models.
Relationships between dynamics, microphysics and electricity are underlined with different cases. Budgets are realized with a tropical squall line in 2D. Simulations of the supercellular and of the multicellular storms are done in 3D with sensitivity tests on the electrification and on the lightning flashes schemes. Then, NOx production by lightning flashes is illustrated on the 10 July STERAO storm.
Document type :
Theses
Complete list of metadata

https://theses.hal.science/tel-00011490
Contributor : Williams Exbrayat Connect in order to contact the contributor
Submitted on : Monday, January 30, 2006 - 10:29:27 AM
Last modification on : Wednesday, November 16, 2022 - 11:46:09 AM
Long-term archiving on: : Saturday, April 3, 2010 - 8:06:15 PM

Identifiers

  • HAL Id : tel-00011490, version 1

Citation

Christelle Barthe. Etude de l'activité électrique des systèmes orageux à l'aide du modèle Méso-NH. Physique [physics]. Université Paul Sabatier - Toulouse III, 2005. Français. ⟨NNT : ⟩. ⟨tel-00011490⟩

Share

Metrics

Record views

272

Files downloads

1282