Characteristics of gravity wave activity and spectra in the upper stratosphere and upper mesosphere at Arecibo during early April 1989

Details Characteristics of gravity wave activity and spectra in the upper stratosphere and upper mesosphere at Arecibo during early April 1989 Characteristics of gravity wave activity and spectra in the upper stratosphere and upper mesosphere at Arecibo during early April 1989

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..425s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 3, p. 425-439.

Physics

34

Atmospheric Density, Emission Spectra, Gravity Waves, Mesosphere, Optical Radar, Stratosphere, Airglow, Richardson Number, Wind Variations, Wind Velocity Measurement

Scientific paper

Twenty-nine hours of Rayleigh/Na lidar observations were obtained on six different nights from 6 to 11 April 1989 during the AIDA-89 Campaign. The lidar data were used to calculate the relative atmospheric density perturbations and their spectra. The average rms density perturbations for early April at Arecibo are 6.2 percent in the upper mesosphere and 1.4 percent in the upper stratosphere. The temporal frequency spectra of the mesopause region density perturbations exhibit power-law shapes with an average slope of -1.76 and magnitude at omega = 2pi/(1 h) of 1.2/(cycles/s). The vertical wave number spectra also exhibit power-law shapes with average slopes of -2.66 in the upper stratosphere and -3.15 in the upper mesosphere. The magnitudes of the stratospheric spectra were consistently smaller than the mesopause spectra at all wave numbers less than m = 2pi/(1 km). At m = 2pi/(4 km) the density spectra magnitudes were 5-12 times smaller in the upper stratosphere. The observed spectra appear to be compatible with the recently published nonlinear wave-induced diffusion and nonlinear wave-induced Doppler spreading theories.

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