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鄂西南地区地面中-β尺度环流系统与暴雨
The Relationship between the Near-surface Meso-β Scale Circulation Systems and the Heavy Rainfall Events in the Sanxia Gorge Region of the Changjiang River
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摘要: 分析长江三峡—湖北西南部地区五年夏季的暴雨过程，发现80%的过程中都有中-β尺度的气旋（平均直径97km）和反气旋（平均直径114km）环流系统活动，它们各有其集中出现的区域，基本不相混杂。这些区域和该地区夏季地面平均流场图上的中-β尺度气旋及反气旋中心位置一致。在平均雨量及暴雨月数分布上也有反映。其中，气旋环流中心对暴雨的作用可能主要是触发机制。从它们经常出现的区域及位置集中的事实；并配合地形图来看，表明地形对它们的生成有决定性影响。Abstract: In this paper, the heavy rainfall events in the Sanxia Gorge region of the Changjiang River and the southwestern region of Hubei Province during the summers 1983—1987 are analyzed. It is found that about 80% of the events are associated with meso-β scale cyclones are anticyclones with mean diameters of 97 and 114 km respectively. These meso-β scale cyclones are anticyclones are respectively concentrated in different areas essentially without overlapping. The areas are coincided with the meso-β scale cyclones or anticyclones system on the mean surface streamline chart and with the climatological distribution of the rainfall and heavy rainy day in the region. Compared the areas of high frequency of occurrence of the meso-β cyclones and anticyclones with the topographical features, it is demonstrated that the terrain plays a crucial role in producing the meso-β cyclones or anticyclones
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