ON THE EFFECT OF THE MEAN SHEAR WIND IN THE PREDICTED UNIVERSAL SPECTRAL SHAPE OF THE ATMOSPHERIC VARIABLES

The Doppler shift undergone by a single quasi-sinusoidal wave in a con stant, stratified, mean shear background atmosphere is analytically an d numerically considered. This wave does not encounter critical levels for the elementary cases here considered. The idealized picture inten ds to illustrate the ''zeroth order'' effect of a mean shear wind prof ile on the resulting shape of temperature and wind spectra. The trial of different vertical shear structures suggests that only the linear o r quasilinear wind profiles are able to reproduce adequately the exper imental spectral slopes. For a linear shear and different incident wav elengths, slope values near to -3 are found and the calculated spectra close resemble those observed from atmospheric data.