Adaptation of the RegCM3 climate model for the Carpathian Basin

作者：Torma Csaba^*; Bartholy Judit; Pongracz Rita; Barcza Zoltan; Coppola Erika; Giorgi Filippo

来源：Idojaras, 2008, 112(3-4): 233-247.

• regional climate model
• temperature
• precipitation
• Carpathian Basin
• model validation

Sensitivity experiments of present day climate (1961-1970) using the well-known regional climate model RegCM3 are analyzed over a complex topography domain covering the Carpathian Basin and its surroundings. The horizontal resolution of the model experiments is 10 km, the highest so far used with the RegCM modeling framework. When RegCM3 is run with the original settings used for coarser resolutions, highly unrealistic precipitation values are found in the selected domain, namely a large overprediction of precipitation. In order to reduce this large precipitation bias, we adjusted some of the parameters in the precipitation parameterization and compared results with the original model set up. Annual and seasonal average temperature and precipitation over different sub-regions of the domain are intercompared across the model versions and compared to observational datasets. The results show that the performance of the modified model is considerably better for the Carpathian Basin, especially for annual and seasonal precipitation, which show small biases with the new parameter setting. Our study indicates that some model parameters may have to be suitably modified to use the RegCM at very high resolutions.

• 出版日期2008-12