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12 December 2006 Estimation of gravity wave energy in the low latitude middle atmosphere using lidar
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Abstract
Using the altitude profiles of temperature fluctuations obtained from Rayleigh Lidar observations at Gadanki (13.5°N, 79.2°E), India, the characteristics of gravity waves were studied. For this study the temperature profiles on 30 nights during January to March 1999 and 21 nights during February 2000 in the 27-65 km altitude region are used. The gravity wave perturbations showed periodicities in the 0.5 - 3 hours range and attain large amplitudes ~8 K in the mesosphere. The phase profiles shows downward propagation indicating the upward wave energy propagation with a vertical wavelength of 5-7 km. The vertical profile of potential energy per unit mass are computed from the temperature fluctuations. The observed energy growth is less than the theoretically expected energy growth, which indicates that the wave is getting damped. The percentage of dissipation of prominent periodicities of gravity waves is calculated at various height levels. It is observed that gravity waves are dissipated more in mesosphere than in stratosphere. The day to day variability of prominent periodicities are studied.
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Deepa V., Geetha Ramkumar, Maria Antonita, and B. V. Krishnamurthy "Estimation of gravity wave energy in the low latitude middle atmosphere using lidar", Proc. SPIE 6409, Lidar Remote Sensing for Environmental Monitoring VII, 64090U (12 December 2006); https://doi.org/10.1117/12.694341
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