Relations between the Length of Time under Analysis and the Statistical Quantities of the Atmospheric Turbulence

[摘要] Owing to the circumstances that the atmospheric turbulence consists of eddies of various scales, scale of eddies detected by observations usually increases, as the time duration of the observations increases. Therefore, statistical quantities of the atmospheric turbulence obtained by observations within a finite time interval depend considerably on the time interval. In the present paper, the relations between the length of time under analysis and the quantities of turbulence, i.e. the Eulerian correlation coefficient, the scale of turbulence and the eddy diffusion confficient, were investigated. Comparison of these theoretical results with observed data confirmed their validity.Furthermore, it is an important problem to study how to compare the records of fluctuations obtained with various anemometers with each other. In the latter part of this paper, this subject is discussed from the view point of the over-lapping-mean procedure.

[学科分类] 大气科学