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Séminaire

Titre : Downscaling climate model predictions using consistent physics between the CAM5 and WRF models
Nom du conférencier : Jerome FAST
Son affiliation : Pacific Northwest National Laboratory, Richland, USA
Laboratoire organisateur : Labex IPSL
Date et heure : 22-02-2013 14h30
Lieu : LMD, Ecole Polytechnique, Palaiseau, salle du PMC, aile 5, 2e étage
Résumé :


Jerome Fast, en visite à Paris pour 2 mois dans le cadre du Labex IPSL, donnera un séminaire sur l'analyse de simulations réalisées avec le modèle WRF dans lequel la physique de CAM5 a été intégrée afin d'étudier les performances de cette physique à des échelles plus fines et comparables à des données de campagne d'observations.


Downscaling climate model predictions using consistent physics between the CAM5 and WRF models


Jerome Fast, Po-Lun Ma, Balwinder Singh, William Gustafson Jr., Phil Rasch, and Richard Easter


Rapid development and evaluation of the next generation physics suite for global climate models requires the ability to easily isolate processes and test parameterizations across a range of scales. While global models will be run at higher and higher spatial resolution in the future, the performance of the current physics suite in representing regional-scale atmospheric variability has not been tested. To address this issue, we have ported the physics suite from the Advanced Physics Community Atmosphere Model v.5 (CAM5) to the regional Weather Research and Forecasting (WRF) model. In this way, we can 1) perform regional downscaling of climate model predictions using consistent physics and 2) test the physics schemes over a range of spatial scales more compatible with field campaign measurements. The modular nature of WRF also enables individual CAM5 physics parameterizations to be directly compared to other parameterizations used for research applications in regional models. Some of the performance, behavior, and scale dependence of some of the CAM5 physics parameterizations are compared to field campaign data as well as with other parameterizations. Results from two field campaign periods are presented: the ISDAC, ARCTAS, and ARCPAC campaigns conducted in the vicinity of Alaska during April 2008, and the MILAGRO campaign conducted over Mexico during March 2006. Differences between the global CAM5 simulations and the regional WRF simulations for these regions are quantified as well.


Ce séminaire sera suivi d'une discussion avec Jérôme, sans doute très instructive pour nous pour l'intégration de la physique de LMDZ dans WRF. Venez nombreux!

Contact :

sophie.bastin@latmos.ipsl.fr, kathy.law@latmos.ipsl.fr