| 波状基本气流中的若干扰动动力学问题 |
| |
| 引用本文： | 叶笃正.波状基本气流中的若干扰动动力学问题[J].气象学报,1964,34(1):1-10. |
| |
| 作者姓名： | 叶笃正 |
| |
| 作者单位： | 中国科学院地球物理研究所 |
| |
| 摘 要： | 纯粹的平直西风是非常少见的。在平均图上大槽大脊非常清楚。这些平均槽脊表示在大气中有着位置比较稳定不变的大型扰动。波谱分析的研究证实了这一点。因此环流的最基本状态是波状的西风带,而不是平直西风带。本文就是研究波状西风带中扰动动力学。由扰动方程中可以看出通过西风带中的基本波动,不同波长的扰动有了相互制约的关系。以平直西风为基本气流的扰动方程中不出现这种现象。 本文给出了若干扰动相互制约的规则,并研究了初值为一单波的扰动在波状西风带中的演变过程。理论计算给出了若干符合于观测事实的现象,尤其是一个槽的加深过程颇似Bjerknes辐散槽的模式。
|
| 收稿时间： | 1962/9/13 0:00:00 |
| 修稿时间： | 1962/10/1 0:00:00 |
SOME ASPECTS OF THE DYNAMICS OF DISTURBANCES IN A WAVE-SHAPED BASIC WESTERLY CURRENT |
| |
| T. C. YEH.SOME ASPECTS OF THE DYNAMICS OF DISTURBANCES IN A WAVE-SHAPED BASIC WESTERLY CURRENT[J].Acta Meteorologica Sinica,1964,34(1):1-10. |
| |
| Authors: | T C YEH |
| |
| Institution: | Institute of Geophysics and Meteorology, Academa Sinica |
| |
| Abstract: | A purely tonal current is very rare in the atmosphere. In the mean maps planetary waves are very clear. These mean waves indicate that in the atmosphere there exist large-scale disturbances whose geographic positions are fairly fixed. The analysis of the spectra of the atmospheric waves proves this inference. Thus the basic state of the atmospheric circulation should be a wave-shaped westerly current, but not a purely tonal one. This paper thus investigates the dynamics of disturbances in wave-shaped westerlies. The equation for the disturbed motion shows that in such a basic current the disturbances of different wave lengths mutually interact. This does not happen in a purely tonal basic current.Several rules governing the mutual interaction between the disturbances of different wave lengths are given. The evolution of an initially single-wave disturbance in the wave-shaped basic westerlies is also studied. The theoritical calculations give several phenomena which agree very well with the observations. It is especially worth mentioning that the deepening process of a trough is very like that of the difluent trough of Bjerknes. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《气象学报》浏览原始摘要信息 |
| 点击此处可从《气象学报》下载免费的PDF全文 |
