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Title : Downscaling climate model predictions using consistent physics between the CAM5 and WRF models
Name of the speaker : Jerome FAST
Affiliation : Pacific Northwest National Laboratory, Richland, USA
Laboratory organizer : Labex IPSL
Date and time : 22-02-2013 14h30
Location : LMD, Ecole Polytechnique, Palaiseau, salle du PMC, aile 5, 2e étage
Summary :

In the frame of Labex IPSL, Jerome Fast is a visiting scientist now working at LATMOS. He will give a seminar on the analysis of downscaled climate simulations using the WRF model.

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.

Contact :

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