关键词: 区域气候模式, PRECIS, ERA40

Abstract: A numerical simulation during 40 years(1961-2000) with a horizontal resolution of 50km over China was carried out by the regional climate model PRECIS,which was driven by ERA40 reanalysis data.The simulated temperature and precipitation were analyzed by comparing with observations.The results showed that the model performed well in simulating the annual and seasonal patterns of spatial distribution of temperature and precipitation over China,and could reproduce well inter-annual change of temperature and precipitation,especially the warm winters in late 1980s and the summer extreme precipitation in 1998.However there were still some disadvantages about the model.A systematic warm bias of about 1～3℃ was found in the simulated temperature over China,more annual precipitation was simulated in Inner Mongolia and Northeast China, the scope of the precipitation in south of the Yangtze River and Sichuan basin were obviously too large,and the location moved south.Overall,the model showed better in simulating temperature than precipitation,both spatial distribution and inter-annual change.

Key words: Regional climate model(RCM), Regional climate model(RCM), PRECIS, ERA40