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1998年7月21~22日鄂东沿江连日特大暴雨成因探讨
引用本文:胡伯威,崔春光,房春花.1998年7月21~22日鄂东沿江连日特大暴雨成因探讨[J].大气科学,2001,25(4):479-491.
作者姓名:胡伯威  崔春光  房春花
作者单位:1.武汉暴雨研究所,武汉 430074;北京大学暴雨监测与预测国家实验室,北京 100871
基金项目:国家自然科学基金资助项目4987501l
摘    要:分析了1998年7月21~22日连续两天发生在鄂东沿江的特大暴雨的环流背景特点和中尺度演变过程,并对其成因作了初步探讨.揭示了一种晚梅雨期特有的能把沿江东移的暴雨系统阻滞在鄂东形成持续和重复大暴雨的环流形势.结合当时的环境气流背景,讨论了大别山与鄂东南山地之间的NW-SE向河谷地形导致暴雨在夜间沿河谷产生和持续的可能机制.其中包括地形的机械和热力作用导致的中尺度环流变化,和在此情况下形成的一种长生命,强对流云系动态结构.

关 键 词:特大暴雨    中尺度分析    地形作用

Causes of a Two-Day Successively Extremely Heavy Rain along the Changjiang Valley in the Eastern Hubei Province during 21 ~ 22 July 1998
Hu Bowei,Cui Chunguang and Fang Chunhua.Causes of a Two-Day Successively Extremely Heavy Rain along the Changjiang Valley in the Eastern Hubei Province during 21 ~ 22 July 1998[J].Chinese Journal of Atmospheric Sciences,2001,25(4):479-491.
Authors:Hu Bowei  Cui Chunguang and Fang Chunhua
Abstract:The characteristics of the synoptic background and meso-scale evolution process of the extremely heavy rain which successively occurred along the Changjiang Valley in the eastern Hubei Province during 21-22 July 1998 are analysed, and the causes of this strinking event are preliminarily probed in this paper. One kind of obstructive synoptic situations peculiarly in late Meiyu season is found. In this situation, the heavy-rain systems which move eastward along the Changjiang River will be detained near the eastern Hubei Province and result in continued and successively heavy rain there. The possible mechanism how the terrain of a NW-SE-oriented valley between the Dabie Mountains and the southeastern Hubei Province mountain area interacts with the environmental air flow in special structure resulting in the nocturnal initiation and long maintenance of the heavy rain along the valley is tentatively discussed.
Keywords:extremely heavy rain  meso-scale analysis  terrain effect
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