Spatial Structure of Fluctuating Components of the Horizontal Wind Speed Above the Ocean

[摘要] Cross correlations of horizontal wind fluctuations between points separated in space were measured at the Marine Observation Tower with a network of three-dimensionally distributed cup-anemometers. The phase shift of wind fluctuations between vertically separated points, and the coherence of wind fluctuations between points arranged in vertical, lateral and longitudinal directions were calculated. The vertical, lateral and longitudinal sizes of the turbulent eddy were empirically formulated in terms of the vertical, lateral and longitudinal coherences, respectively. A model of three-dimensional structure of horizontal wind components is represented by a distorted cylindrical form. Taylor's hypothesis of frozen turbulence is confirmed to hold for every frequency (0.01 Hz〈n〈0.5 Hz).

[学科分类] 大气科学