Simulazioni con il modello climatico regionale COSMO-CLM

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L’esperimento CORDEX (Coordinated Regional climate Downscaling EXperiment), interno al programma WCRP (World Climate Research Program), assicura il coordinamento globale del downscaling climatico regionale (Regional Climate Downscaling, RCD) per migliorare l’adattamento ai cambiamenti climatici e la valutazione degli impatti su scala regionale.
In un articolo pubblicato di recente su Meteorology and Athmospheric Physics un gruppo di scienziati (tra questi, i ricercatori CMCC E. Bucchignani, L. Cattaneo e P. Mercogliano) ha presentato i risultati del lavoro sulle simulazioni realizzate con il modello climatico regionale COSMO-CLM, sulla base delle reanalisi di ERA-Interim, per il dominio Medio Oriente – Nord Africa (dominio CORDEX-MENA).
Obiettivo dello studio era quello di verificare le performance dei modelli per variazioni dei parametri fisici principalmente correlati alla parametrizzazione di superficie, convezione, radiazione e nuvole.

L’abstract dell’articolo:
The results of a sensitivity work based on ERA-Interim driven COSMO-CLM simulations over the Middle East-North Africa (CORDEX-MENA) domain are presented. All simulations were performed at 0.44° spatial resolution. The purpose of this study was to ascertain model performances with respect to changes in physical and tuning parameters which are mainly related to surface, convection, radiation and cloud parameterizations. Evaluation was performed for the whole CORDEX-MENA region and six sub-regions, comparing a set of 26 COSMO-CLM runs against a combination of available ground observations, satellite products and reanalysis data to assess temperature, precipitation, cloud cover and mean sea level pressure. The model proved to be very sensitive to changes in physical parameters. The optimized configuration allows COSMO-CLM to improve the simulated main climate features of this area. Its main characteristics consist in the new parameterization of albedo, based on Moderate Resolution Imaging Spectroradiometer data, and the new parameterization of aerosol, based on NASA-GISS AOD distributions. When applying this configuration, Mean Absolute Error values for the considered variables are as follows: about 1.2°C for temperature, about 15 mm/month for precipitation, about 9% for total cloud cover, and about 0.6 hPa for mean sea level pressure.

Leggi la versione integrale dell’articolo:

Bucchignani E., Cattaneo L. , Panitz H., Mercogliano P.
Sensitivity analysis with the regional climate model COSMO-CLM over the CORDEX-MENA domain
2015, Meteorology and Atmospheric Physics, DOI: 10.1007/s00703-015-0403-3

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