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)。
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 meridion- ally 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 fronto- genesis/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(de- creased)as a function of the rise in precipitation category.
出处
《南京气象学院学报》
CSCD
1996年第2期197-203,共7页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金49475252
关键词
梅雨
暴雨
降水强度
成因
Meiyu rainfall
heavy rain
rainfall intensity
