CWRF Application In East China Monsoon Area

The domain of a regional climate model must be carefully selected for its specific application. RCMs are run over limited-area domains and are driven by time-dependent large-scale meteorological fields specified in a buffer area adjacent to the domain's lateral boundaries. Thus, a successful RCM downscaling from GCM predictions requires an accurate buffer zone treatment that integrates realistic energy and mass fluxes across the RCM lateral boundaries. The most importmant part of the thesis is the choice of model domain. Three factors are considered carefully to decide the best model domain for East China Monsoon Area application. The CWRF—Cliamte extension of WRF—developed by Xin-Zhong Liang is used in the thesis to study the effects of lateral bondary conditions (large scale driver field, buffer zone location, data assimilation technique) as well as model domain on the simulation of East China precipitation. On the basis of the decided model domain and lateral boundary conditions, the experiment of nesting and horizontal grid spacing are conducted to study the scheme of CWRF application in East China. The object of regional climate model is to conduct relative accurte climate simulation, so for the selected model domain, the model internal physical processes are important. While for specific area and regional climate model, the different physical processes have distinct performances. For this consideration, the sensivitiy experiments are conducted to investigate the performances of the physical processes coupled in CWRF. On account of RegCM3 is the most popular regional climate model in China, a comparison between CWRF and RegCM3 simulation results is conducted and the conclusion is that CWRF has apparent superiority than RegCM3.