Abstract
The turbulent structure of the atmospheric boundary layer above the ocean was inves-tigated by experimental measurements of wind vectors and air temperature at several points around a marine observation tower, and the space correlation of turbulence is estimated from the behaviour of eddies with frequency under near neutral conditions in the surface layer.
Coherences of wind vector and of air temperature are considered to be the unique func-tion of the frequency which is non-dimensionalized by the mean wind velocity and the height, and of the distance which is non-dimensionalized by the height. Phase spectra are also considered. Furthermore the coherence in three-dimensional space and the phase spec-trum in a vertical direction are formulated with the exponential and algebraic functions respectively. They are confirmed by the simultaneous measurement of turbulent air flow. However when the distance is very large, the lateral and vertical wind components do not always obey the present empirical forms.
An integral scale of turbulent eddies with frequency is evaluated from the empirical formula of the coherence, and its relation to characteristics of the surface layer is discussed. Eddy slopes are estimated from the observed vertical phase spectrum and the integral scale.
