中文摘要：

利用“我国西北干旱区陆一气相互作用观测试验”在敦煌双墩子戈壁站取得的观测资料及最近的一些研究成果对陆面模式中反照率、相似性函数及地表粗糙度（动量粗糙度，标量粗糙度）3个方面的参数化方案进行了改进，然后对一次典型降水过程的陆面特征及近地层的风、温、湿进行了模拟．结果表明：改进的模式能对降水条件下的干旱区陆面特征进行较好的模拟，其中对辐射、地表温度的模拟相当好，而对能量的模拟虽然还有要改进的地方，但总体结果令人满意；另外改进后的模式对近地层的温度和湿度的模拟也有明显的改善．

英文摘要：

A land-surface model is improved by using some new research results. Net radiation, upward longwave radiation, surface temperature, sensible heat, latent heat and temperature, specific humidity and wind speed in the ground layer under precipitation are simulated by using the data observed at Dunhuang during the ＂Field Experiment on Interaction between Land and Atmosphere in the Arid Region of Northwest China＂. The results show that the improvement is significant. The radiation flux and surface temperature are well simulated. The simulation of energy is also good. In addition, the simulation of the temperature and specific humidity in the ground layer by the new model is much better than that of the unimproved model.