The climate version of the Eta regional forecast model. 2.Evaluation of the Eta CCS model performance against reanalysis data and surface observations

摘要: The climate version Eta CCS, prepared from the NCEP forecast model, was integrated over South America for period January 1979 to December 1983. model driven by two sets of boundary conditions derived reanalysis and outputs HadAM3P atmospheric global model. mean output fields precipitation, precipitation frequency, near surface air temperature, simulated were compared with observational data CRU GPCP projects. This comparison shows that reproduces well main patterns summer winter observed America. But magnitude is underestimated ETA CCS in regions strong convection activity summer. underestimation larger than reanalysis. number wet days overestimated HadAM3P. both runs closer observations. temperature are reproduced overestimates central part continent due lack convective cloudiness this region. captures annual cycle six selected On whole, these results support conclusion some improvements can be used downscaling fields.