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中文摘要：
利用RegCM3对1998年东亚夏季胍气候进行了季节尺度模拟，并利用小波分解方法对比分析了模式对中国各气候区夏季降水多尺度振荡的模拟能力。结果表明：模式能基本准确模拟1998年夏季中国各气候区逐月平均降水的分布和中国东部雨带推进过程，但模拟和观测的逐日降水演变存在明显区别。模式对各气候区低频降水的模拟准确率一般都是最高的，降水模拟误差主要是由模式对其他各周期分量降水振荡模拟误差造成的，一般对降水高频振荡模拟误差都比较大。各区域降水分别存在主振荡类型，模式对1998年夏季华南地区降水主振荡（低频和8d周期振荡）和长江中下游地区降水主振荡（4d周期振荡）模拟较好是这两个地区降水模拟准确率较高的主要原因。
英文摘要：
The comparison stu of precipitation over climatic sub dy on the ability of regional climate model to describe the multi timescale oscillation regions of China was conducted, in terms of the wavelet decomposition technique, based on a seasonal scale regional climate modeling to the summer of 1998 with RegCM3. The results show that the model can reproduce the scenario of monthly precipitation over subregions, as well as the withdraw/extension of precipitation belt over eastern China, but the discrepancy of simulated and observed temporal variation of daily pre cipitation is significant. Generally, the simulated precipitation at lower-frequency is better than that at higher-frequencies, and the error for the simulation to high-frequency precipitation is bigger basically. There exist the main precipitation oscillations in each climatic subregion. The main precipitation oscillations over Southern China （with lower-frequency and 8 day period） and over the lower and middle reaches of Yangtze River （with 4-day period） are simulated in a precise manner, which is the reason why the precipitation is reproduced well over those subregions in the summer of 1998.
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