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Couplage aérosols-microphysique pour la simulation des cyclones tropicaux : Cas du cyclone Dumile (2013)

Abstract : Intensity forecast of tropical cyclones is a major scientific issue. Among many factors, the impact of cloud microphysics and aerosols on intensity variations has been recently underlined. This issue motivated the evaluation of the 2-moment microphysical scheme LIMA in a tropical context and the development of a coupling with the aerosol scheme ORILAM into the atmospheric model Meso-NH. The interest of this numerical development is to represent the emission of sea salt aerosols depending on cyclonic winds and oceanic parameters. The application of this aerosols-microphysics coupling to the simulation of tropical cyclone Dumile (2013) shows that the coupled model tends to improve the representation of the intensity, the track, the microphysical structure of the tropical cyclone and the associated precipitation, when comparing with observations. The secondary production of ice crystals is also an active research topic in cloud microphysics. A parameterization of the collisional ice break-up process is thus implemented into the microphysical scheme LIMA. The impact of this process has been analyzed on a mid-latitude storm and on tropical cyclone Dumile. Both case studies display similar results regarding this process: an increase of ice crystals concentration and mass, and a decrease of precipitation. The continuation of this work could allow to determine if this process of secondary formation could improve the cirrus modelling in tropical cyclones.
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Submitted on : Monday, September 24, 2018 - 10:43:57 AM
Last modification on : Monday, April 6, 2020 - 2:49:37 PM
Long-term archiving on: : Tuesday, December 25, 2018 - 12:51:12 PM


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  • HAL Id : tel-01879641, version 1


Thomas Hoarau. Couplage aérosols-microphysique pour la simulation des cyclones tropicaux : Cas du cyclone Dumile (2013). Physique [physics]. Université de la Réunion, 2018. Français. ⟨NNT : 2018LARE0012⟩. ⟨tel-01879641⟩



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