Dominant vertical scales of gravity waves in the middle atmosphere observed with the MU radar and rocketsondes |
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| Institution: | 1. Radio Atmospheric Science Center, Kyoto University, Uji, Kyoto 611, Japan;2. Department of Electrical Engineering II, Kyoto University, Kyoto 606, Japan;1. Department of Mechanical Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan;2. Photron Ltd., 1-105, Kanda Jinbo-cho, Chiyoda-ku, Tokyo, 101-0051, Japan;1. Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK;2. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA;1. Key Laboratory of Synthetic Rubber & Laboratory of Advanced Power Sources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022, PR China;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022, PR China;3. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Dong Nanhu Road, Changchun, 130033, PR China |
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| Abstract: | We have simultaneously observed wind motions in the altitude range of 5–90 km by means of the MU radar, rocketsondes and radiosondes. Dominant vertical scales of wind fluctuations due to gravity waves were 2–5 km in the lower stratosphere, about 5–15 km in the upper stratosphere and longer than 15 km in the mesosphere. The increase in the vertical scale with altitude is interpreted in terms of the saturation of upward propagating gravity waves. In the stratosphere, the observed vertical wavenumber spectra showed smaller amplitudes and more gradual slopes than the model values. Furthermore, the wind velocity variance in the stratosphere increases exponentially with an e-folding height of about 9 km, implying that the gravity waves were not fully saturated. On the other hand, the spectra in the upper stratosphere and mesosphere agreed fairly well with the model spectra. The variance in the mesosphere seems to cease increase of the wave amplitudes and agrees reasonably well with the model value. |
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