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The activity of the medium-scale eastward travelling waves simulated in an atmospheric general circulation model is investigated. The simulated waves have the same features as those of the observed me...dium-scale eastward travelling waves: the wavelength, the period, the horizontal structure with geostrophic balance, the vertical structure with hydrostatic balance trapped at the tropopause and so on. The area where the amplitude of this wave is large, is located east of 100$^{circ}$E along 40$^{circ}$N latitude line, which indicates that this wave is originated from Tibetian Plateau region. The region with active velocity disturbance extends more westward than that with active geostrophic velocity disturbance which is calculated from geopotential field. This means that the velocity disturbance develops first and that the geopotential disturbance follows it. It supports the possibility that this wave is excited through mechanical causes such as instability of the westerly jet続きを見る
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