敦煌干旱区一次降水过程陆面特征模拟

Simulation of Land-surface Characteristic under Precipitation Condition in Dunhuang Arid Region

利用"我国西北干旱区陆—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,对陆面模式进行了改进,然后对一次典型较大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,能量的模拟总体结果令人满意;另外由于本模式专门考虑了近地层的影响,所以对近地层的风速、温度和湿度的模拟结果相当好。

A land-surface model is improved by using some new research results.Net radiation, surface temperature, sensible heat, latent heat and temperature, specific humidity and wind velocity in ground layer under precipitation condition are simulated by using the data observed at Dunhuang in the “Field Experiment on Interaction between Land and Atmosphere in the Arid Region of Northwest China'.The results show that the model is ameliorated well.The radiation flux and surface temperature simulation are better than energy. The simulation of the temperature, specific humidity and wind speed in ground layer is well because the ground layer is considered alone in this model.