Modelling the January and July Climate of 9000 Years before Present

The January and July climate of 9000 years before present was simulated through a set of perpetual experiments by means of the newly designed 9-Level Atmospheric General Circulation Model (AGCM) in the Institute of At-mospheric Physics (IAP). The results were analysed and compared with previous results simulated by the IAP 2-Level AGCM. There exists good agreement between them. It is found that the temperature is higher in July and lower in January in 9000 yBP than that at present. The temperature difference is more obvious in the Northern Hemisphere than in the Southern Hemisphere and greater in July than in January. These results prove the potential abilities of the 9-L AGCM in the climate simulation and climate prediction.