Lidar observations of long-period gravity waves in the stratosphere

Details Lidar observations of long-period gravity waves in the stratosphere Lidar observations of long-period gravity waves in the stratosphere

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..588m&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, Sept. 1991, p. 588-596.

Physics

25

Gravity Waves, Optical Radar, Radar Tracking, Stratosphere, Atmospheric Density, Density Distribution, Perturbation Theory, Rayleigh Scattering

Scientific paper

Lidar observations of Rayleigh backscatter have been used to derive molecular densities at stratospheric heights over Aberystwyth (52.4 deg N, 4.1 deg W) for a total of 50 nights during the period October 25, 1987 - September 25, 1990. The variations of density perturbation, represented in time-height contours, are used to identify the presence of atmospheric gravity waves in the height range 30-60 km. The results suggest the frequent occurrence of quasi-monochromatic waves with vertical wavelengths ranging from 4 to 15 km and apparent periods exceeding the inertial value in about 50 percent of the cases. The wave perturbations are considered in terms of the potential energy per unit mass and the height variation of this quantity suggests there is considerable energy dissipation in winter, but little in summer. The potential energy shows a marked seasonal variation with maximum values being observed in winter at all heights, but a semiannual component is also apparent at the greater heights.

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