1998年7月20~21日武汉地区梅雨锋上突发性中-β系统的发生发展分析
AN ANALYSIS ON DEVELOPMENT OF MESO-Β CONVECTIVE SYSTEM ALONG MEIYU FRONT ASSOCIATED WITH FLOOD IN WUHAN IN 20-21 JULY 1998
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摘要: 1998年7月21日鄂东南地区出现特大暴雨,其中武汉市出现1 h降水量超过88 mm的突发性大暴雨(简称“98.7”大暴雨)。通过诊断分析发现:武汉地区的“98.7”突发性大暴雨是中-β尺度系统强烈发展引起的;在暴雨发生前武汉附近整个对流层大气积聚了大量的水汽,整个层结接近饱和,并且蕴涵着大量对流有效位能(CAPE);中-β尺度系统形成后停滞少动数小时,使中-β系统区域积累大量的可降水,引起“98.7”突发性强暴雨。
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关键词:
- 突发性;
- 中-β尺度系统;
- 有效位能 (CAPE)
Abstract: On 21 July 1998 a flash flood associated with a meso-β convective system occurred in Wuhan, producing 88 mm rainfall in an hour. A diagnostic study of the genesis and development of the mesoscale convective system (MCS) is presented. The conclusions are as follows: (1) The flash flood occurred during the rapidly developing stage of the MCS. (2) There was aboundent moisture gathered in the lower troposphere and the atmosphere was nearly saturated with a big store of convective available potential energy (CAPE). (3) The MCS became nearly stationary in the vicinity of Wuhan after formed and a great amount of rainfall was accumulated in this area.-
Key words:
- Flash flood;
- MCS;
- CAPE
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