T. C. YEH. 1964: SOME ASPECTS OF THE DYNAMICS OF DISTURBANCES IN A WAVE-SHAPED BASIC WESTERLY CURRENT. Acta Meteorologica Sinica, (1): 1-10. DOI: 10.11676/qxxb1964.001
Citation: T. C. YEH. 1964: SOME ASPECTS OF THE DYNAMICS OF DISTURBANCES IN A WAVE-SHAPED BASIC WESTERLY CURRENT. Acta Meteorologica Sinica, (1): 1-10. DOI: 10.11676/qxxb1964.001

SOME ASPECTS OF THE DYNAMICS OF DISTURBANCES IN A WAVE-SHAPED BASIC WESTERLY CURRENT

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  • Received Date: September 12, 1962
  • Revised Date: September 30, 1962
  • Published Date: February 19, 2013
  • 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.
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