“98.7”武汉及其附近地区特大暴雨中若干观测事实的分析
ANALYSIS OF SOME OBSERVATIONAL FACTS RELATED TO TORRENTIAL RAINS IN JULY 1998 IN WUHAN AND THE VICINAL AREA
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摘要: 利用高空和地面加密观测资料、常规观测报告及每小时GMS IR卫星云图, 分析了1998年7月20~23日出现在长江中下游各省的暴雨过程, 重点揭示发生在武汉及其附近地区特大暴雨的若干观测事实。研究指出, 造成该地区特大暴雨的直接影响系统是对流层中低层的中α尺度辐合中心, 该系统具有冷心结构特征, 它的上空对流层上部为暖心, 出现强烈的增温。高层扰动、地面流场的中小尺度扰动与暴雨增幅紧密关联。Abstract: Some observational facts of the to rrential rain event occurred in Wuhan and the vicinal area from 20 to 23, July 1998 are analyzed by using conventional and intensive observational data as well as satellite data. The results show that this event was directly caused by a meso-α scale convergence center in the lower troposphere. The meso-α scale system has a cold core structure and a warm core in the upper troposphere. The strong disturbance in the upper troposphere and lower stratosphere and the mesoscale disturbance at surface are related with this torrential rain.
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