荒漠下垫面陆面过程和大气边界层相互作用敏感性实验

Sensitivity Tests of Interaction between Land Surface Physical Process and Atmosphere Boundary Layer on the Underlying Desert Surface

建立了一个研究荒漠下垫面陆面物理过程与大气边界层相互作用的模式。模拟了荒漠下垫面的土壤环境物理、地面热量通量、蒸发、蒸散及大气边界层结构特征。并对主要的环境物理参数进行了敏感性实验。结果表明 ,本模式能合理地模拟荒漠下垫面地表热量平衡、土壤体积含水量、地表植被蒸发散阻抗、地表水汽通量日变化和湍流交换系数、湍流动能、位温和比湿廓线等。该模式还可进一步应用于研究区域陆面物理过程与大气边界层相互作用机制 。

In this paper, an interactive model between land surface physical process and atmosphere boundary layer is established. Then it was used to simulate the features of soil environmental physics, surface heat fluxes, evaporation from soil, evapotranspiration from vegetation and structures of atmosphere boundary layer on the underlying desert surface. The sensitivity experiments engaged for primary physics parameters. The results show that this model can reasonably simulate the diurnal variations of heat balance, soil volumetric water content, resistance of vegetation evaporation, flux of surface moisture, and profiles of turbulent exchange coefficient, turbulent momentum, potential temperature, and humidity mixing ratio. The model developed can be used to study the interaction between land surface processes and atmospheric boundary layer in city regions, and it can be used in the simulation of climate through incorporating a mesoscale model.