A study of statistical properties of atmospheric gravity waves

A study of the wave parameters of atmospheric gravity waves measured by using an array of microbarographs, is presented. The pressure fluctuation records from the microbarographs are processed, numerically filtered, and spectrally analyzed. Cross-correlation, spectral density, phase spectra, and coherence spectra analyses are performed. The experimental results of a half-year study of continuous records and moving cross-spectral analyses from August 1982 to January 1983 are summarized. It is shown that the frequency of the occurrence of gravity waves with significant coherence is 92 percent, the mean rms amplitude is 3.3 Pa, and the mean phase velocity is 33m/s. The diurnal and seasonal dependence of the occurrence and amplitudes of internal gravity waves are examined. The mean wave amplitudes are found to be lower during the months of August to October, as compared with the higher levels in November to January.