Journal ArticleDOI
A Climatology of Gravity Wave Motions in the Mesopause Region at Adelaide, Australia
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TLDR
In this paper, a statistical study of gravity wave motions in the mesosphere and lower thermosphere measured with a MF partial reflection radar located at Buckland Park new Adelaide (35°S, 138°E) in the period November 1933 to December 1984 is presented.Abstract:
A statistical study of gravity wave motions in the mesosphere and lower thermosphere measured with a MF partial reflection radar located at Buckland Park new Adelaide (35°S, 138°E) in the period November 1933 to December 1984 is presented. The analyses am confined to waves with ground based periods between 1 and 24 h. Time-height cross sections show that the mean square amplitudes u′2 and v′2, of the zonal and meridional perturbation velocities, respectively, vary in a predominantly semiannual manner such that the minima in wave activity coincide with the reversals in the zonal circulation in the middle atmosphere. In most instances, v′2 is greater than u′2 which, together with the small but nonzero u′v′ fluxes shows that the gravity wave field is partially polarized. A technique similar to that used to analyse partially polarized electromagnetic waves suggests that on a seasonal basis, the wave field is polarized by about 10% to 20% but for shorter periods the degree of polarization may be signi...read more
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Journal ArticleDOI
Gravity wave dynamics and effects in the middle atmosphere
TL;DR: In this article, a review of gravity wave sources and characteristics, the evolution of the gravity wave spectrum with altitude and with variations of wind and stability, the character and implications of observed climatologies, and the wave interaction and instability processes that constrain wave amplitudes and spectral shape are discussed.
Journal ArticleDOI
Gravity waves in the tropical lower stratosphere: An observational study of seasonal and interannual variability
TL;DR: In this paper, the authors studied seasonal and interannual variations in gravity wave activity in the lower stratosphere (18-25 km) of Cocos Islands (12°S, 97°E) in the Indian Ocean between September 1992 and June 1998.
Journal ArticleDOI
Mesospheric temperature inversion and gravity wave breaking
TL;DR: In this paper, a statistical study of the inversion characteristics was performed at two Rayleigh lidars located in south of France 550 km apart, and it was shown that its altitude ranges from 55-72 km in winter to 70-83 km in summer, while its probability of occurrence presents a semi-annual variation with a maximum higher in winter than in summer and a minimum lower in May than in September.
Journal ArticleDOI
Satellite observations of atmospheric variances: A possible indication of gravity waves
Dong L. Wu,Joe W. Waters +1 more
TL;DR: The Microwave Limb Sounder (MLS) on the Upper Atmosphere Research Satellite has now produced the first global maps of small-scale variances in the middle atmosphere as discussed by the authors.
Journal ArticleDOI
Analysis and interpretation of airglow and radar observations of quasi-monochromatic gravity waves in the upper mesosphere and lower thermosphere over Adelaide, Australia (35°S, 138°E)
Richard L. Walterscheid,James H. Hecht,Robert A. Vincent,Iain M. Reid,J. Woithe,Michael P. Hickey +5 more
TL;DR: In this article, the directionality of quasi-monochromatic (QM) waves in the mesopause region is found to be highly anisotropic, especially during the solstices.
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