[1] [1] Fritts D C, Alexander M J. Gravity wave dynamics and effects in the middle atmosphere[J]. Rev Geophys, 2003, 41: 1003.

[2] [2] Gardner C, Voelz D. Lidar measurements of gravity wave saturation effects in the sodium layer[J]. Geophys Res Lett, 1985, 12: 765-768.

[3] [3] Gardner C, Voelz D. Lidar studies of the nighttime sodium layer over Urbana, Illinois, 2. Gravity waves[J]. J Geophys Res, 1987, 92(A5): 4673-4694.

[4] [4] Yang G, Clemesha B, Batista P, et al. Lidar study of the characteristics of gravity waves in the mesopause region at a southern low-latitude location[J]. Journal of Atmospheric and Solar-Terrestrial Physics, 2008, 70(7): 991-1011.

[5] [5] Gardner C S. Diffusive filtering theory of gravity wave spectra in the atmosphere[J]. J Geophys Res, 1994, 99: 20601-20622.

[6] [6] Dewan E M, Good R E. Saturation and the "universal" spectrum for vertical profiles of horizontal scalar winds in the atmosphere[J]. J Geophys Res, 1986, 91: 2742-2748.

[7] [7] Hines C O. The satuaration of gravity waves in the middle atmosphere, II. Doppler-spread theory[J]. J Atmos Sci, 1991, 48: 1360-1379.

[8] [8] Weinstock J. Saturated and unsaturated spectra of gravity waves and scale-dependent diffusion[J]. J Atmos Sci, 1990, 47: 2211-2225.

[9] [9] Yang G, Clemesha B, Batista P, et al. Improvement in the technique to extract gravity wave parameters from lidar data[J]. J Geophys Res, 2008, 113: D19111.

[10] [10] Xu J. Perturbations of the sodium layer: controlled by chemistry or dynamics [J]. Geophys Res Lett, 2003, 30(20): 2056.

[11] [11] Beatty T J, Hostetler C A, Gardner C S. Lidar observations of gravity waves and their spectra near the mesopause and stratopause at Arecibo[J]. American Meteorological Society, 1992, 49: 477-496.

[12] [12] Collins R, Hallinan T, Smith R, et al. Lidar observations of a large high altitude sporadic Na layer during active aurora[J]. Geophys Res Lett, 1996, 23(24): 3655-3658.

[13] [13] Collins R L, Nomura A, Gardner C S. Gravity waves in the upper mesosphere over Antarctica: Lidar observations at the South Pole and Syowa[J]. J Geophys Res, 1994, 99: 5475-5485.

[14] [14] Gardner C, Taylor M. Observational limits for lidar, radar, and airglow imager measurements of gravity wave parameters[J]. J Geophys Res, 1998, 103(D6): 6427-6437.