Numerical study of the propagation of small-amplitude atmospheric gravity wave

By using a two-dimensional fully nonlinear compressible atmospheric dynamic numerical model, the propagation of a small amplitude gravity wave packet is simulated. A corresponding linear model is also developed for comparison. In an isothermal atmosphere, the simulations show that the nonlinear effects impacting on the propagation of a small amplitude gravity wave are negligible. In the nonisothermal atmosphere, however, the nonlinear effects are remarkable. They act to slow markedly down the propagation velocity of wave energy and therefore reduce the growth ratio of the wave amplitude with time. But the energy is still conserved. A proof of this is provided by the observations in the middle atmosphere.

作 者： YUE Xianchang YI Fan Liu Yingjie LI Fang   作者單位： YUE Xianchang,YI Fan(Electronic Information School of Wuhan University, Wuhan 430079, China;Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430079, China)

Liu Yingjie(Electronic Information School of Wuhan University, Wuhan 430079, China)

LI Fang(Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China) 

刊 名： 科學(xué)通報(bào)（英文版）  SCI 英文刊名： CHINESE SCIENCE BULLETIN  年，卷(期)： 2005 50(13)  分類號(hào)： P1  關(guān)鍵詞： nonlinearity   gravity wave packet   simulation  

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