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气象:1993,19(6):3-7
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1991年江淮梅雨期间的热带环流异常
(国家气象中心,北京 100081)
Tropical Circulation Characteristics Associated with the Severe Rainfall in the Jianghuai Area during the Summer of 1991
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中文摘要: 利用1980—1991年热带风场资料,以月、季为时间尺度,分析了1991年江淮梅雨期间的热带环流特征,并对热带风场和江淮流域降水量进行谱分析。结果表明:热带环流异常与雨带长期稳定在江淮流域有密切的关系,孟加拉湾及南海的偏南气流较常年偏强,其中源于孟加拉湾的水汽输送更为重要。热带风场具有与江淮降水变化基本相同的振荡周期,可能是造成降水周期变化的重要原因之一。
Abstract:Monthly and seasonal tropical circulation characteristics associated with the severe rainfall in the Jianghuai Area during the summer of 1991 are investigated by comparative analysis. The spectrum analyses on wind fields show that the anomaly of tropical circulation is closely related with the stable rainfall band. The southly flow field with positive anomaly in the Bay of Bangal and South China Sea contributes to the severe rainfall in the Jianghuai Area. The flow generated from the Bay brings much more water vapour and plays a more important role. The oscillation of the tropical wind fields presents with the cycling periods the same with those of the rainfall perturbation, which seems to be one of the important factors causing the rainfall cycle.
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引用文本:
何敏,1993.1991年江淮梅雨期间的热带环流异常[J].气象,19(6):3-7.
,1993.Tropical Circulation Characteristics Associated with the Severe Rainfall in the Jianghuai Area during the Summer of 1991[J].Meteor Mon,19(6):3-7.