Abstract:

Improving parameterization scheme in land surface process was one of the important contents of making better land surface model. In this paper, an soil-vegetation-atmosphere model was improved by parameterization scheme and was validated by using the observation data of Dunhuang station of NWC-ALIEX in Northwest China from September 2000 to August 2001. The results show that sensible heat flux was larger than latent heat flux in Dunhuang, it was almost four times of the latent heat flux in summer, and both were very small in winter. The trend of observed surface temperature and simulated values was consistent, but peak values of shallow soil moisture were overestimated. About surface radiation, the simulated upward long wave radiation was better than that of the net radiation. Meanwhile, it overestimated the peak value of the surface energy. The results show that the parameterization scheme can improve the results in land surface process model over typical arid area.

Key words: land surface characteristics, typical arid region, available energy, parameterization

摘要：

利用2000年9月至2001年8月“我国西北干旱区陆-气相互作用试验（NWC-ALIEX）”敦煌站的陆面过程观测资料，基于已有的参数化结果，模拟了敦煌主要陆面特征。结果表明：典型干旱区敦煌夏季感热通量与潜热通量差异显著，感热几乎是潜热的4倍，冬季二者都很小。模式对地表温度模拟较好，但高估了浅层土壤湿度峰值；对向上辐射模拟较好，但对净辐射的模拟存在较大偏差；同时高估了地表能量的峰值。模式结果表明参数化方案对干旱区陆面过程模式具有一定的改进作用。

关键词: 陆面特征, 典型干旱区, 可利用能量, 参数化方案