1991年梅雨期江淮地区持续性暴雨降水强度的变化及其成因
投稿时间:1995-04-20  修订日期:1995-12-21  点此下载全文
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作者单位
寿绍文 南京气象学院气象学系, 南京 210044 
励申申 南京气象学院气象学系, 南京 210044 
基金项目:国家自然科学基金49475252
中文摘要:1991年夏季江淮地区持续性暴雨过程中,降水强度的变化具有多周期性,逐日雨带呈南北向摆动。短时降水的变化与低空南风强弱变化及低空辐合、高空辐散的强弱和锋生(消)等的短期变化相联系。68%的区域降水量由降水率大于(等于)5mm·h-1的强降水所造成,32%由降水率小于5 mm·h-1的弱降水所造成。单站降水量中强(弱)降水的时间和雨量比重随着降水强度等级的提高而增大(下降)。
中文关键词:梅雨  暴雨  降水强度
 
VARIATION IN RAINFALL INTENSITY OF 1991 HEAVY RAIN OVER CHANGJIANG-HUAIHE VALLEYS AND ITS FORMATION
Abstract:Study of the summer 1991 persistent heavy rainfall event over the Changjiang-Huaihe valleys exhibits multi-periods for rainfall intensity,revealing that the rainbelt oscillated meridionally on a daily basis;variation of short-term precipitation was associated with the short-range change in vigor of low-level southerly,low-level convergence,upper-level divergence and frontogenesis/frontolysis;the rainfall of≥5 mm·h-1(<5 mm·h-1)accounts for 68%(32%)of the regional precipitation;the duration and amount of intense(weak)rainfall increased(decreased)as a function of the rise in precipitation category.
keywords:Meiyu rainfall  heavy rain  rainfall intensity
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