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Modèle couplé global de climat de l’IPSL

Modèle couplé global de climat de l’IPSL. Jean-Louis Dufresne Institut Pierre Simon Laplace Laboratoire de Météorologie Dynamique. Journée BASC modélisation couplé, 3 octobre, Paris. The IPSL-CM5 Earth System Model. Strong coupling between processes

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Modèle couplé global de climat de l’IPSL

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  1. Modèle couplé global de climat de l’IPSL Jean-Louis Dufresne Institut Pierre Simon Laplace Laboratoire de Météorologie Dynamique Journée BASC modélisation couplé, 3 octobre, Paris

  2. The IPSL-CM5 Earth System Model Strong coupling between processes Full integration of the physical and biogeochemical models

  3. Processes: change of scales • Atmospheric parameterisations • LES/CRM simulations, case study LMDZ in single column mode clouds same forcings x= y= 1km LMDZ in zoomed/nudged mode and/or with analysis restarts • Large domain CRM simulations • Diurnal cycle, coupling with surface • Intermittent precipitation (stochastic triggering of convection) • Organised convection • Micro et macro-physique of clouds • ….

  4. DYNAMICO: new dynamical core, icosahedral Bench for a low resolution model (96x96 L39) 256 DYNAMICO Number of simulated year/day 32 LMDZ 4 256 4096 16 Number of cores Bench with different resolutions • Present: • New transport schema • Quasi-uniform mesh • Energy conserving • Regular increase of the horizontal resolution: • from hundreds to tenths of kilometres • Plans: • Stretched grid • Non hydrostatic • In the IPSL-CM model • Deep atmospheres (planets)

  5. Atmosphere: grid refinement • Example of domains: • Mediterranean • Europe • West Africa • India • China – South Est Asia • South America • Antarctica • Greenland • Planed work: • Automation of tools • ESM (chemistry, aerosols…) • Coupling with the ocean (West-Africa – Gulf of Guinea, Arctic basin…)

  6. Spécificités, forces et faiblesses: • S’affranchir des difficultés liées aux conditions aux frontières des modèles à aire limitée • Aborder la questions des « échelles intermédiaires » entre les échelle locales et globales • Modèle intégré (ESM) existant et évoluant • Paramétrisation indépendante des régions étudiées • Échelle horizontales sup. à la dizaines de km, « régionale » et globale

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