| INFLUENCES OF NONUNIFORM STRATIFICATION ON WAVE RAYS OF INTERNAL GRAVITY WAVE |
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| 作者姓名： | 吕克利 徐亚梅 |
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| 作者单位： | Department of Atmospheric Sciences Nanjing University，Nanjing 210008，Department of Atmospheric Sciences，Nanjing University，Nanjing 210008 |
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| 基金项目： | This research is supported by the National Natural Science Foundation of China. |
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| 摘 要： | In this paper the influences of nonuniform stratification on the propagating paths of internal inertial-gravity andpure gravity wave energy are discussed by using the WKB approximation method.The conditions for conservation ofwave energy,generalized wave action and wave enstrophy are obtained.The necessary condition of instability for inter-nal gravity waves and the equation governing the refraction of wave rays are derived.Two types of critical levels are giv-en.Finally,the wave rays for different distributions of stratification are calculated by using the fourth-orderRunge-Kutta method.
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INFLUENCES OF NONUNIFORM STRATIFICATION ON WAVE RAYS OF INTERNAL GRAVITY WAVE |
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| Lu Keli Xu Yamei.INFLUENCES OF NONUNIFORM STRATIFICATION ON WAVE RAYS OF INTERNAL GRAVITY WAVE[J].Acta Meteorologica Sinica,1994(3). |
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| Authors: | Lu Keli Xu Yamei |
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| Affiliation: | Lu Keli Xu Yamei Department of Atmospheric Sciences,Nanjing University,Nanjing 210008 |
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| Abstract: | In this paper the influences of nonuniform stratification on the propagating paths of internal inertial-gravity and pure gravity wave energy are discussed by using the WKB approximation method.The conditions for conservation of wave energy,generalized wave action and wave enstrophy are obtained.The necessary condition of instability for inter- nal gravity waves and the equation governing the refraction of wave rays are derived.Two types of critical levels are giv- en.Finally,the wave rays for different distributions of stratification are calculated by using the fourth-order Runge-Kutta method. |
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| Keywords: | internal gravity wave wave rays WKB approximation method atmospheric nonuniform stratification |
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