THE DEVELOPMENT OF SYMMETRIC DISTURBANCE SUPERPOSED ON BAROCLINIC FRONTAL ZONE UNDER THE ACTION OF DEFORMATION FIELD<sup>*</sup>期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

THE DEVELOPMENT OF SYMMETRIC DISTURBANCE SUPERPOSED ON BAROCLINIC FRONTAL ZONE UNDER THE ACTION OF DEFORMATION FIELD^*

Authors:	WANG Xingbao and WU Rongsheng

Affiliation:	The Key Laboratory of Mesoscale Severe Weather (MOE), Nanjing University, Nanjing 210093;The Key Laboratory of Mesoscale Severe Weather (MOE), Nanjing University, Nanjing 210093

Abstract:	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>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.

Keywords:	frontogenesis development of symmetric disturbance WKBJ method

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