Existing information concerning the characteristics of atmospheric turbulence is analyzed, and some representative figures on the resulting scattering of sound to be expected are obtained. The nature of such turbulence, the extent and causes of the anisotropy near the ground, the variation in its character with altitude, and the extent to which approximation of isotropy are valid are discussed. Other micrometeorological parameters are considered and their effects on sound propagation in comparison to those caused by velocity fluctuation estimated. A reasonable spectral function for isotropic turbulence is applied to a scattering cross‐section expression derived by Kraichnan to obtain numerical results for the scattering. These are compared with recent experimental data.

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