【摘 要】
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The development of symmetric disturbance superposed on the background field of Hoskins-Bretherton (1972) frontogenesis model is investigated by means of WKBJ ap
【机 构】
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The Key Laboratory of Mesoscale Severe Weather MOE
论文部分内容阅读
The development of symmetric disturbance superposed on the background field of Hoskins-Bretherton (1972) frontogenesis model is investigated by means of WKBJ approach. It is found that the forcing of large-scale deformation, the frontal circulation and the spatial-temporal variations of stability parameters (F2, N2, M2) can bring about the development of symmetric disturbance,even though the frontal baroclinic flow is symmetric stable (F2N2- M2 =q ＞ 0). The frontogenetical process of deformation confluence zone and the ascending branch of frontal circulation are in favor of the development of symmetric disturbance. The actions of ageostrophic shear in frontal zone and the variation of stability parameters are dependent on the structure of disturbance.
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