关键词: 陆气湍流模型, 结皮层, 湍流输运, 数值模拟

Abstract: In the paper, we have elucidated the importance of investigation on land surface-atmosphere interaction for mankind's living environment protection and local economics development as well as its present state. Based on the previous work, a coupling micro meteorological model for SPAC system over wheat field in the Tengger Desert is presented. Especially, the leaf stoma non-saturation condition is considered to calculate the evapotranspiration, and the root absorption model is revised as well. The presence of micro biotic crust changes the soil hydraulic conductivity, alters the temporal and spatial distribution of limited precipitation in sand layer and leads to the degradation of deep-rooted shrubs. The canopy is divided into several layers, aiming at revealing the vertical profiles of mean quantities within it and providing scientific basis for parameterization of terrestrial processes. The model is shown capable of well simulating the micro environment of wheat canopy in good agreement with measured mean temperature, specific humidity and latent heat fluxes et al. And the sensitivity test is carried out as well to analyze canopy's influence.

Key words: land-atmosphere turbulent model, crust layer, turbulent transfer, numerical simulation