遵义市降水日变化特征分析

Characteristics analysis of diurnal variation of the precipitation in Zunyi

利用遵义市14个气象观测站2005—2015年逐时降水资料,从逐时降水量、降水频次、降水强度、降水昼夜分配等方面分析了遵义市降水日变化的基本特征。结果表明:降水量、降水频次和降水强度都主要集中在夜间,其中春、秋季降水日变化特征较为统一,夜间降水量级、频次和强度都明显多于白天;而冬季降水日变化总体不大,夏季降水日变化则表现为多波动性。遵义市夜雨特征显著,60%以上的降水出现在夜间,其中春季夜雨比率最大,其次是冬季,再次是秋季,而夏季夜雨表现并不十分明显,夜间降水量和降水频次占全天的合计比率冬、春、夏、秋季全市平均分别为68%、77%、54%、63%。降水量日变化与降水频次关系密切,受降水强度的影响次之。

Using the hourly precipitation data of meteorological observatory from the 14 meteorological observing stations from 2005 to 2015,we try to analyze the basic characteristics of the hourly rainfall,rainfall frequency,and the rainful distribution of days and nights in Zunyi. The results show that the precipitation,precipitation frequency and intensity were mainly concentrated in the night. In the spring and autumn,the precipitation diurnal variation characteristics were more uniform. Night precipitation,frequency and intensity were significantly more than the day. Winter precipitation day change was not obvious in general. The diurnal variation of precipitation in summer was much more volatile. The characteristics of rainfall at night in Zunyi city were significant,more than60% of the precipitation occurred in the night,for which the largest rainfall ratio was in the spring night,followed by winter,then the fall,while the summer night rainfall performance was not very obvious. Nighttime precipitation and precipitation frequency accounted for the total rate of the total day in winter,spring,summer and autumn in the city were 68%,77%,54%,63%. Precipitation change is closely associated with precipitation frequency,followed by the influence of rainfall intensity.