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气象:2004,30(1):22-27
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2003年6月29日至7月2日淮河梅雨锋大暴雨过程诊断分析
(国家气象中心,北京 100081)
Diagnoses of Meiyu Front Associated with Heavy Rain over Huaihe Valley during 29 June-2 July 2003
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中文摘要: 对2003年6月29日至7月2日梅雨期淮河流域一次大暴雨过程进行了天气动力学诊断分析。结果表明:这次大暴雨过程是在双阻型梅雨天气形势下发生的,梅雨锋锋区热力学特性和动力结构多变,一般具有斜压性结构,但有时又表现出准正压性结构;梅雨锋的维持和加强主要依赖于低空强西南暖湿气流在梅雨锋区的辐合抬升作用提供水汽和能量,强降雨区位于水汽通量大值区北侧强梯度区中。
Abstract:A heavy rain process over the Huaihe Valley during 29 June-2 July 2003 was studied to analyze the thermodynamic and dynamic features of Meiyu front. The following are some conclusions: (1) The event happened under "double blocking" Meiyu synoptic situation, dynamic and thermodynamic structure of the Meiyu front continuously changed. Generally, Meiyu front shows a feature of baroclinicity, but sometimes the front is almost vertical with an apparent quasi barotropy feature. (2)The moisture and energy provided by the convergence and upward motion of the strong southwestern warm and moist air current were responsible for the strengthening and maintaining of the Meiyu front. The heavy precipitation area was located in the strong gradient region north to the maximum of moisture flux.
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引用文本:
薛建军,康志明,张芳华,2004.2003年6月29日至7月2日淮河梅雨锋大暴雨过程诊断分析[J].气象,30(1):22-27.
,2004.Diagnoses of Meiyu Front Associated with Heavy Rain over Huaihe Valley during 29 June-2 July 2003[J].Meteor Mon,30(1):22-27.