中文摘要：

以P-σ9层区域气候模式（P-σRCM9）和普林斯顿海洋模式（POM）为基础，建立了一个区域海气耦合模式P-σRCM9-POM，对1958—1997年40年中国东部降水进行数值模拟．通过分析耦合模式的模拟结果和没有耦合POM的P-σRCM9的模拟结果及其与中国气象局整编的1951—2001年720站逐日降水资料之间的差异，评估区域海气模式对我国东部地区降水的模拟能力．结果表明，耦合模式能较合理地模拟降水的季节变化及中国主要雨带的季节性进退，非耦合模式降水量偏大，耦合模式对此有一定改善，并且耦合模式模拟的降水空间分布比非耦合模式更接近观测．通过进一步分析不同等级雨量的模拟结果，发现江淮流域50～100mm／候的降水出现频数较多，是耦合模式中江淮流域降水量模拟偏大的主要原因．另外耦合模式和非耦合模式模拟的强度较小的降水（小于25mm／候）出现频数都偏少．非耦合模式模拟的华南地区大于100mm／候的降水出现频数偏多，耦合模式对此有所改善．

英文摘要：

A regional air-sea coupled model （P-σ RCM9-POM） is developed based on P-σ 9-level regional climate model （P-σ RCMg） and Princeton oceanic model （POM）. Compared with the uncoupled model results and the observed daily precipitation data at 720 stations over China, the impacts of the air-sea coupling on precipitation simulation in eastern China are analyzed. The results show that the coupled model can simulate the spatial precipitation distribution and the seasonal march of major rainband in eastern China. The regional air-sea coupled model P-σ RCMg-POM has better performance in simulating the multiyear mean precipitation distribution, and the rainband location and intensity in the coupled model are more reasonable than those in the uncoupled model. But the mean precipitation is a little bit more over the Yangtze River-Huaihe River basin, and rainband reaches a position more northward than the observation in summer. This bias of the precipitation simulation is caused by excessive precipitation of 50-100 mm/pentad over this area in summer. And the occurrence frequency of precipitation with light intensity （〈25 mm/pentad） both in the coupled model and uncoupled model are below observation. Occurrence frequency of precipitation more than 100 mm/pentad over South China area simulated by the uncoupled model is more than observation. The coupled model improves this simulation bias.