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一次右移传播的强对流风暴研究
INVESTIGATION ON A SEVERE CONVECTIVE STORM MOVING RIGHT
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摘要: 对1998年6月21日华北平原强对流风暴的天气动力学分析表明, 这次强对流风暴是发生在华北区域出现前倾性阶梯槽形势下, 对流层中、下层的差动温度平流和干暖盖的存在是对流不稳定层结形成和发展以及有效对流能量存储的重要条件;对流层中、低层的西风扰动触发对流云团生成, 而对流云团在明显右移传播过程中不断发展增强, 是与对流云团南侧存在明显的动压垂直加速度、高能暖湿气流的不断输入以及对流云团的合并有关。Abstract: Synoptic and dynamic conditions of a severe convective storm occurring in the plain of North China on 21 June 1998 were investigated. It was favorable for the occurrence of the storm. In addition, a warm-dry cover and the differential temperature advection between mid- and low- troposphere are quite important to the formation and development of convective instability, and to the accumulation of convective available potential energy as well. The genesis of convective clouds was triggered by the turbulence of westerly in the mid- to low-troposphere. Moreover, the convective clouds kept on developing during their process moving rightward. Such phenomenon was relevant to dynamic pressure vertical acceleration locating to the south of convective clouds, the import of the warm-wet air and the clouds combination.
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图 5 1998年6月21日08:00 500 hPa位势高度图
(图中数字单位为dagpm)(图中粗实线为500 hPa槽线, 粗虚线为700 hPa槽线, 细虚线为850 hPa槽线和切变线)
表 1 1998年6月21~22日邢台局地大气对流参数
表 2 1998年6月21日20:00各探空站大气对流参数
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