Abstract
The mutually interacting pressure wave and diabatic heating wave originally cause the observed tropical disturbances. The equivalent barotropic models relate the tendency of vorticity with the convective heating effect directly, and so these models elucidate the roles of these mutually interacting waves on the development of observed tropical disturbances readily. The exact solution for the complex frequency adequately explains the growth and movement of tropical disturbances during summer. The results are divided into two parts 1) for the upper atmosphere 2) for the lower atmosphere. For the upper atmosphere during summer, the standing and amplifying natures of wave numbers 1 and 2 are satisfactorily interpreted. So the standing natures and the intensity variations of Atlantic trough, African high, Tibetan high, Pacific trough, and Mexican high etc. are also explained thereby. Also, the amplification and westward movement of short wave number 8 are interpreted. For the lower atmosphere during summer, the amplifications and westward movements of Carribean easterly wave, African monsoon cyclone, Indian monsoon depression, west Pacific ITCZ wave etc. are explained.
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