| 高原热力作用下的非绝热Rossby波 |
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| 作者姓名： | Li Liming Huang Feng Chi Dongyan Liu Shikuo Wang Zhanggui |
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| 作者单位： | Li Liming Huang Feng Chi Dongyanand Liu ShikuoSchool of Physics，Peking University. Beijing 100871Wang ZhangguiNational Marine Environment Forecast Center，Beijing 100081 |
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| 摘 要： | 从含非绝热项的准地转运动方程组出发，分析了青藏高原大尺度热力作用下非绝热Rossby波的一些性质。从理论上证明当背景西风气流为正压时，冬季高原冷却作用有利于Roosby波的经向传播。又由非绝热Rossby波的频率方程说明冬季高原的热力作用是中高纬季节内振荡的重要激发机制。此外，当背景西风气流为斜压时，求解了高原热力作用下非绝热Rossby波的频率，并由频率方程说明冬季高原冷却作用有利于波动向不稳定方向发展，而夏季高原的大尺度热力作用对波动稳定性的影响存在临界值。
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| 关 键 词： | 高原热力作用 非绝热Rossby 准地转 经向传播 低频振荡 稳定性 |
| 收稿时间： | 15 September 2001 |
Thermal effects of the tibetan plateau on rossby waves from the diabatic quasi-geostrophic equations of motion |
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| Li Liming,Huang Feng,Chi Dongyan,Liu Shikuo,Wang Zhanggui.Thermal effects of the tibetan plateau on rossby waves from the diabatic quasi-geostrophic equations of motion[J].Advances in Atmospheric Sciences,2002,19(5):901-913. |
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| Authors: | Li Liming Huang Feng Chi Dongyan Liu Shikuo Wang Zhanggui |
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| Institution: | School of Physics Peking University, Beijing 100871,School of Physics Peking University, Beijing 100871,School of Physics Peking University, Beijing 100871,School of Physics Peking University, Beijing 100871,National Marine Environment Forecast Center, Beijing 100081 |
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| Abstract: | From the diabatic quasi-geostrophic equations of motion, the authors analyze the characteristics ofdiabatic Rossby waves including the thermal effects of the Tibetan Plateau. When the basic zonal flow isbarotropic, it is demonstrated that the cooling of the Tibetan Plateau in winter not only facilitates themeridional propagation of Rossby waves but is an important driving mechanism of the intraseasonaloscillations in middle and high latitudes. When the basic zonal flow is baroclinic, it is found that the coolingof the Tibetan Plateau in winter facilitates the instability of Rossby waves, while in summer there is athreshold for the influence of the heating of the Tibetan Plateau on the stability of Rossby waves. |
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| Keywords: | diabatic Rossby waves quasi-geostrophic equations meridional propagation low-frequency oscillation stability |
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