我国草原下垫面低层大气湍流结构   总被引：3，自引：1，他引：3  

刘树华  刘和平  洪钟祥  李军  刘辉志  那景阳  吴志明 《大气科学》1996,20(3):378-383

利用超声风速仪资料分析了科尔沁草原下垫面低层大气的湍流谱结构，无量纲化湍流速度分量及温度脉动的标准偏差，和湍流通量与稳定度参数的关系。结果表明，草原下垫面低层大气湍流速度谱，在较宽的稳定度范围内， 符合Kolmogorov 相似理论，在惯性副区接近局地各向同性，无量纲化湍流速度分量及温度脉动的标准偏差服从A(1-Bζ)1/3和A(-ζ)-1/3规律， 湍流热通量与稳定度参数ζ存在较好的相关性。  相似文献   

TURBULENCE CHARACTERISTICS OF THE ATMOSPHERIC SURFACE LAYER OVER AN OPEN GRASSLAND     

刘树华  刘和平  梁福明  吴风雷  徐梅  洪钟祥  李军  刘辉志  那景阳  吴志明 《Acta Meteorologica Sinica》1997,(3)

Described in this paper is an experiment on atmosphere-surface turbulent exchange andboundary layer turbulence properties conducted in July 1994 over the Kerqin Grassland,Jilin,China.The characteristics of the turbulent spectrum,and the relationships of the standarddeviation of the turbulent velocity components and sensible heat flux with the atmospheric stabilityare studied using data from a sonic anemometer and a fast-response platinum resistancethermometer mounted on a 100 m tower.The results show that in the surface layer over a flat,uniform and open grassland,for a broad stability range(-22.12≤Z_(?)L≤17.98),the velocityspectra obey the-2/3 power law in the inertial subrange,and 1 power law at low frequencies.Under near neutral stratification,σ_u/u_*=1.20,σ_v/u_*=1.23 and σ_w/u_*=1.02.For Z_i/L≤-0.2,the standard deviations of the turbulent velocity components follow a 1/3 power law.ForZ_i/L≤-0.1,the standard deviation of the temperature fluctuations follows a-1/3 power law,and as Z_i/L≤-0.08,it exhibits nonlinear behavior.Sensible heat flux is well correlated to thestability parameter.  相似文献