Abstract: An integrated and flexible numerical model has been established to simulate and study the evaporation, transpiration and evapotranspiration mechanism of moisture on land, surface with complex vegetative cover. To better simulate this process, the authors apply some reasonable modifications to the parameterization of edaphic process too. The model is used to simulate the process of Zhangye station during IOP2 of HEIFE, and the results are generally in good agreement with observations. It indicates that the model developed can be used to study the interaction between land surface and atmospheric boundary layer over arid and semi, arid regions. Thus it can be used on evaluating the environment and shaping measures for sustainable development.

Key words: soil, vegetation, atmosphere interaction, evaporation and transpiration and evapotranspiration process, land surface process model, HEIFE

摘要： 利用建立的土壤, 植被, 大气系统水分散失耦合模式,研究了一定植被覆盖下区域近地面层的水分蒸散过程。模式对土壤水分传导和恢复过程的参数化引入了一些改进。利用此模式模拟了黑河实验(HEIFE)中1991-08-13—17日张掖观测站所在位置的能量通量和近地面温湿度的变化,得到了与观测值相一致的结果,合理地再现了此阶段内蒸散过程的变化趋势。此模式能比较有效地模拟区域复杂下垫面与大气边界层的相互作用,对于区域气候和生态效应的研究有一定的帮助。

关键词: 土壤-植被-大气相互作用, 蒸散过程, 陆面过程模式, 黑河实验