SIMULATION OF MONTHLY CLIMATIC MEAN FIELD IN JANUARY AND JULY IN QINGHAI-XIZANG PLATEAU AND NORTHWESTERN CHINA

In this paper,we simulate the regional climate in summer and winter in northwestern part of China and the Qinghai-Xizang Plateau with regional climate model(MM4)nested with GFDL data,and compare the simulated results with observed data and GFDL data.The results show that the regional model reproduces the regional climate systems,such as the high pressure on the plateau and the low pressure in the north of the plateau in winter,the warm-low pressure over the plateau and pressure ridge in south and north of the Qinghai-Xizang Plateau in summer.These regional climate features could not be distinguished by the GCM.The simulations of precipitation distribution are reasonable.But differences between the simulated and observed precipitation values in some places are obvious.The precipitation in south of the Qinghai-Xizang Plateau is underestimated,and in north of the Qinghai-Xizang Plateau,the precipitation is overestimated. The simulation of height field is better than temperature field.