| 水平非均匀层结大气中重力波的时空结构 |
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| 作者姓名： | ZHANG Lifeng WANG Xingbao ZHANG Ming |
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| 作者单位： | MeteorologicalCollege,PLAUniversityofSciencesandEngineering,Nanjing211101 |
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| 基金项目： | This study was Supported by the National Special Key Project Fund(No.G1998040907). |
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| 摘 要： | 用WKBJ方法结合特征线法求得了重力波波包在水平非均匀层结和时变层结大气中演变的渐近解，结果表明层结水平非均匀性除引起重力波波幅的变化外，还引起波长和包络宽度的变化，当波包由层结大值区移向层结小值区时，水平波长变短，包络宽度变窄，同时振幅增加。层结随时间的变化不会引起波包波长和包络的宽度的变化，但层结随时间减小时，波包振幅增加。
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| 关 键 词： | 水平非均匀层结 大气 重力波 时空结构 WKBJ方法 特征线法 波长 包络宽度 |
Spatial and Time Structure of a Gravity Wave in Horizontal Atmosphere of Heterogeneous Stratification |
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| ZHANG Lifeng,WANG Xingbao,ZHANG Ming.Spatial and Time Structure of a Gravity Wave in Horizontal Atmosphere of Heterogeneous Stratification[J].Advances in Atmospheric Sciences,2003,20(1):29-36. |
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| Authors: | Lifeng Zhang Xingbao Wang Ming Zhang |
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| Institution: | Meteorological College, PLA University of Sciences and Engineering, Nanjing 211101,Meteorological College, PLA University of Sciences and Engineering, Nanjing 211101,Meteorological College, PLA University of Sciences and Engineering, Nanjing 211101 |
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| Abstract: | By the use of the WKBJ method combined with the characteristic line method, the asymptotic solutionof a gravity wave envelope in the atmosphere of horizontal heterogeneous stratification and time-varyingstratification is obtained. The solution shows that not only the variation of amplitude of the gravitywave but also the variation of wavelength and the width of the envelope are affected by the horizontalheterogeneity. As the wave envelope moves from a region of strong stratification to a weak one, thehorizontal wavelength will become shorter, the width of the envelope will narrow and its amplitude willincrease. The variation of stratification with time cannot lead to the variation of wavelength and envelopewidth, but the amplitude of the wave envelope will increase while the amplitude of the wave decreases in time. |
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| Keywords: | gravity wave envelope WKBJ method characteristic line method |
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