【摘要】 1999年6月下旬长江中下游发生了连续几次梅雨锋锋生和低涡降水.选取其中的一次锋生过程,利用时空高分辨的模式输出结果,分析低层梅雨锋主要特征场的水平分布,垂直结构和时间演变,揭示出梅雨锋的主要特征,证实低层锋北冷空气存在,对比温度的时间变化、湿度的时间变化以及相当位温的时间变化,并通过计算变形向量,散度项的锋生函数以及温度平流,来研究低层梅雨锋结构的演变,分析冷空气在其中的作用.更多还原

【Abstract】 A series of MeiYu frontogeneses and vortex rainfall occurred during 22-30 June 1999. Making use of the output of MM5 model, we choose one of a frontogenesis to analysis the vertical structure, horizontal distribution and time variation of themodynamic feature of MeiYu front. MeiYu front’s characters and cold air in the north of front are investigated. In order to illuminate the evolution of the low MeiYu front and the function of temperature horizontal advection in it, the time variations of temperature, humidity and equivalent potential temperature are compared as well as the divergence frontogenesis and deformation frontogenesis is calculated.更多还原