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The climate version Eta CCS, prepared from the NCEP Eta forecast model, wasintegrated over South America for the period from January 1979 to December1983. The model was driven by the two sets of boundary conditions derived fromthe reanalysis and outputs of HadAM3P atmospheric global model. The mean outputfields of precipitation, precipitation frequency, and near surface airtemperature, simulated by the Eta model, were compared with the observationaldata of the CRU and GPCP projects. This comparison shows that the Eta modelreproduces well the main patterns of the summer and winter observedprecipitation fields over South America. But the magnitude of precipitation isunderestimated by the ETA CCS model in the regions of strong convectionactivity in summer. This underestimation of observed precipitation is largerfor the Eta model driven by HadAM3P than by the reanalysis. The observed numberof wet days is overestimated by HadAM3P. The number of wet days in both runs ofthe Eta model is closer to observations. The main summer and winter patterns ofnear surface air temperature are reproduced well by both HadAM3P and the Etamodel. The Eta model overestimates the observed surface temperature over thecentral part of the continent due to the lack of convective cloudiness in thisregion. The Eta model captures observed annual cycle of precipitation in sixselected regions over South America. On the whole, these results support theconclusion that the Eta model with some improvements can be used fordownscaling of the HadAM3P output fields.

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