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冰川冻土  2013 

西安夏季降水的日变化特征研究

DOI: 10.7522/j.issn.1000-0240.2013.0132, PP. 1176-1182

Keywords: 西安市,日变化,夏季降水

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Abstract:

利用西安市1961-2010年夏季逐时自记降水资料,分析了西安市夏季降水日变化特征及其年代际变化趋势.结果表明近50a来西安市夏季降水日变化在降水量和降水频次上呈现出不一致的变化特征,夏季降水日峰值出现在下午至傍晚,逐时降水量以1500-2000时为高值区,以1700时的累积降水量最大;逐时累积降水频次呈现出双峰型分布,以0400-1000时为降水频次峰值区,以1700-2000时为频次的次峰值区;降水强度以1500-2000时时段小时降水强度大,0400-1300时小时降水强度较小.降水持续时间超过6h的长持续性降水的最大降水量通常出现在清晨和午后,而持续时间在1~6h之间的短持续性降水易于在傍晚达到降水量峰值.

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