Abstract
This paper focuses on the behaviour of moments, up to order 6, of longitudinal and vertical velocity increments, measured in the atmospheric surface layer, at a height of 1.7 m. The local derivatives of these moments with respect to the spatial separation between two points indicate that inertial range power-law exponents cannot be determined unambiguously. This is supported by the local slopes of moments of the locally averaged energy dissipation rate but contrasts with the extensive power-law ranges indicated by spectra of longitudinal and vertical velocity fluctuations. The third-order longitudinal velocity structure function provides stronger evidence of anisotropy in the inertial range than either the second-order velocity structure functions or the velocity spectra.
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