| 稳定的和不稳定的斜压行星波 |
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| 引用本文： | 谢义炳.稳定的和不稳定的斜压行星波[J].气象学报,1981,39(1):44-58. |
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| 作者姓名： | 谢义炳 |
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| 作者单位： | 北京大学地球物理系 |
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| 摘 要： | 本文采用两层模式,初步地应用“时空同化”的自然观,引进空间不稳定性观点,把空间不稳定性和时间不稳定性结合起来,研究振幅随纬度变化的斜压行星波的存在范围和其稳定性;得出了稳定的和不稳定的斜压行星波及其空间不稳定判据,并对传统的斜压行星波不稳定理论和判据作出鉴定,重新提出了斜压行星波时间不稳定判据,并讨论其物理含义;还得出了高层和低层斜压行星波相互强迫振动的机制以及不同纬度间扰动振幅的关系。
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| 收稿时间： | 1980/4/23 0:00:00 |
| 修稿时间： | 1980/6/26 0:00:00 |
THE STABLE AND UNSTABLE PLANETARY WAVES IN THE BAROCLINIC ATMOSPHERE |
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| Xie Yi-bing.THE STABLE AND UNSTABLE PLANETARY WAVES IN THE BAROCLINIC ATMOSPHERE[J].Acta Meteorologica Sinica,1981,39(1):44-58. |
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| Authors: | Xie Yi-bing |
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| Institution: | Department of Geophysics, Beijing University |
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| Abstract: | In this paper, the two-level quasi-geostraphic model is used, the concept of assimilation of space and time is adopted, the idea of space instability is introduced and combined with time instability to study the effects of any disturbance introduced at an unidentified latitude to the general circulation. A general theory about the extent of existence of the planetary waves, the criteria of space and time instabilities and their physical implications, and the coupling of the high and low level planetary waves is presented. The extent of existence of the wave length of the baroclinic planetary waves is closely related to the velocity field and the vertical stratification. The more unstable the vertical stratification is, the shorter the length of the stable, moving planetary waves may appear will be. The vertical stability in the moist baroclinic atmosphere is much less than that in the dry baroclinic atmosphere, therefore, it is possible for stable, moving planetary waves of much shorter wave length to appear in the moist baroclinic atmosphere. Under the ordinary vertical stratification in the troposphere, it will be no stable, stationary ultra-long planetary waves. If the vertical strafication is as stable as that in the stratosphere, there will be stable, stationary planetary waves with wave length longer than 8500 km. |
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