摘要
将Gifford和Legg使用的拉氏动力学技巧从地面层延伸到行星边界层(PBL),讨论了平均风和湍流的垂直非均匀性以及大气稳定度对中尺度扩散特征的影响,得到了它们之间的解析表达式,理论结果与野外实测资料之间有较好的一致性.本文结果表明,经典的湍流统计理论不能直接用来研究中尺度范围的扩散,要合理地考虑动力学因子的影响.
Based on the results that Gifford and Legg have obtained , the Lagrangian Dynamical theory is expanded to mesoscale turbulent diffusion with complex vertical inhomogeneity in PBL . The effects of Coriolis force, vertical inhomogeneity of mean wind and turbulence , and atmospheric stability in the gravitational field on diffusion characteristics of the mesoscale motion, are discussed . Analytic expressions are deduced . There are good agreements between the expressions and experimental data. The results show that the classical turbulent statistical theory can not be directly applied to the diffusion study of the mesoscale motion. Effects of dynamical factors should be considered adequately .
出处
《大气科学》
CSCD
北大核心
1992年第3期361-369,共9页
Chinese Journal of Atmospheric Sciences
关键词
湍流
扩散
拉氏动力学
PBL
Lagrangjan dynamical theory
Mesoscale diffusion
Langevin equation
Inhomogeneous turbnience in the PBL .
