CLM3.0对中国区域陆面过程的模拟试验及评估II：土壤湿度

Using CLM3.0 and atmospheric external forcing data of Princeton University, an off-line test is conducted on the soil moisture in China from 1948 to 2001, we evaluate the capability of CLM 3.0 to simulate the soil moisture in China. The results show that CLM3.0 can basically simulate the spatial distribution of annual average soil moisture in China. The soil is dry in North China but wet in Northeast and Southeast China. However, the simulated soil moisture is generally higher than the observation values. For the five sub-regions, the correlation of inter-annual variability for simulation and observation is the best in Yun-Gui plateau, East China area followed, It is bad in the eastern mid-latitude regions, and the simulation in July is better than in April. CLM can simulate soil moisture trend to a certain degree. It can basically reflect the drying trend of soil moisture in east of Northeast China area, but the rate of change is significantly lower. The simulated trend in Huang-huai and Jiang-huai areas is the worst.