Sensitivity Of Regional Climate Modelling Over Ragged Terrain Of Ethiopia To Boundary Forcing

The RegCM3 rainfall simulations based on the three boundary forcing elds ERA40,rnERAIN and NNRP1 have been compared with observational rainfall over Ethiopia for thernperiod from 1989À€€1999. The RegCM3 simulations are carried out for all three boundaryrn elds with the same horizontal resolution (60 km), domain size and model physics. Thernperformance of RegCM3 in capturing major large scale features, interannual, interseasonalrnand intraseasonal variability over the simulation period is found to be good. However,rnthe RegCM3 simulation based on ERAð€€€INTERIM has captured the features better thanrnthe other two throughout the simulation period. The precipitation from RegCM3 agreernwell with the observed precipitation in general. Comparison of the simulations carried outrnusing the three forcing elds reveals that simulation of rainfall based on ERAð€€€INTERIMrnboundary forcing reproduces observed precipitation from CRU dataset better than thernother two simulations. ERA40 and NNRP1 simulation have shown a negative rainfall biasrncompared to the CRU rainfall for some homogeneous regions of Ethiopia

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