北京城郊近地层湍流实验观测

本文利用两台FA-11超声风速温度仪于1992年3月到４月间在北京325 m气象观测塔47 m和120 m两个高度观测到的风速三个正交分量以及声虚温的湍流脉动资料，计算和分析了北京城郊粗糙下垫面近地层湍流特征量及其日变化，无量纲垂直速度和声虚温的方差随稳定度的变化，风速分量和温度的归一化湍流能谱以及动量和热通量的互谱及其随稳定度的变化。并且与平坦均一下垫面近地层湍流观测的结果进行了对比。

An Experimental Study of Turbulence in Northern Suburban Surface Layer of Beijing

Based upon the data of three orthogonal Wind velocity components and sound temperature measured with two FA-11 ultrasonic anemometer/thermometers at 47 mand 120 m of the Beijing 325 m Metoorological Tower, this paper presents the statistical turbulent characteristics and their diurnal variations in the surface layer over a rough and complex terrain in the northern suburban of Beting. Especlaily, the nondimensiohnal variances of the vertical velocity and sound virtual temperature and their variations with the stability, the normalized velocity component and temperature spectra and cospectra are calculated and compared with the results observed over smooth and homogeneous areas.