边界层湍流适应和通量参数化研究

Numerical simulation combined with observation data analysis was carried out to study characteristics and adjustment of atmospheric boundary layer turbulence to surface heterogeneity. Basic properties and relation of surface heterogeneity with mean turbulent kinetic energy, wind speed and direction had been revealed, as well as turbulent properties varied with different stability and condition of emergency of rolling vortices in convective boundary layer. Numerical results interpreted the reason of a so-called "non-balance of fluxes" in observation. A method of inverse estimation of regional flux was developed. Preliminary results obtained for dust particle dispersion in atmospheric boundary layer. Results of this project provided scientific bases for selection and optimizing key factors for flux parameterization. And in certain degree, they are instructive for design of field experiment and for improving of observation method over a heterogeneous surface.

边界层大气湍流具有适应地面热力、动力性质变化的特点，本项目研究这种湍流适应的过程和规律，了解边界层大气对于地面性质的空间变化强度、尺度等因子的响应，确定区域性通量的参数化关系。由于中尺度和全球大气环流模式都表现出对于下边界通量的敏感性，准确确定网格平均的地面通量是改进数值天气预报和气候模拟研究面临的重要课题，本项目是这方面的基础性工作。