斜压对流边界层中风廓线和湍流特征的研究

在美国Ｋａｎｓａｓ和Ｎｅｂｒａｓｋａ交界处于１９９２年进行的ＳＴＯＲＭ－ＦＥＳＴ（ＳＴｏｒｍ－ｓｃａｌｅ Ｏｐｅｒａｔｉｏｎａｌ　ａｎｄ　Ｒｅｓｅａｒｃｈ　Ｍｅｔｅｏｒｏｌｏｇｙ－Ｆｒｏｎｔｓ　Ｅｘｐｅｒｉｍｅｎｔ Ｓｙｓｔｅｍ　Ｔｅｓｔ）资料基础上，分析了 斜压对流边界层中温度、湿度和风速的垂直分布．分析表明，在对流边界层中温度和湿度常 显示很好的混合；但风速分量有时混合很好，有时则存在切变．计算了存在和不存在风切变 两种情况下的湍流动能收支．最后，讨论了对流边界层中风切变形成的可能原因．

STUDY ON THE WIND PROFILES AND TURBULENT STRUCTURE IN THE BAROCLINIC CONVECTIVE BOUNDARY LAYER

Based on the data of STORM-FEST (STorm-scale Operational and Research Meteorology-Front Experiment System Test) carried out near the boundary of Kansas and Nebraska, U. S. in 1992, the vertical distribution of temperature, humidity and wind velocity in the baroclinic convective boundary layer was analysed. The results show that the temperature and humidity were well mixed in the convective boundary layer. The wind velocity was also well mixed, but there exists wind shear sometime. Under conditions with and without wind shear the turbulent kinetic energy budget was calculated. The possible reasons of wind shear formation in the convective boundary layer were discussed.