杨祖祥, 李萌萌, 钱磊, 张娇, 朱红芳. 安徽省分地形小时极端降水气候分布特征[J]. 云南大学学报(自然科学版), 2020, 42(3): 525-533. doi: 10.7540/j.ynu.20190552
引用本文: 杨祖祥, 李萌萌, 钱磊, 张娇, 朱红芳. 安徽省分地形小时极端降水气候分布特征[J]. 云南大学学报(自然科学版), 2020, 42(3): 525-533. doi: 10.7540/j.ynu.20190552
YANG Zu-xiang, LI Meng-meng, QIAN Lei, ZHANG Jiao, ZHU Hong-fang. Climatic distribution characteristics of hourly extreme precipitation over different terrain areas in Anhui Province[J]. Journal of Yunnan University: Natural Sciences Edition, 2020, 42(3): 525-533. DOI: 10.7540/j.ynu.20190552
Citation: YANG Zu-xiang, LI Meng-meng, QIAN Lei, ZHANG Jiao, ZHU Hong-fang. Climatic distribution characteristics of hourly extreme precipitation over different terrain areas in Anhui Province[J]. Journal of Yunnan University: Natural Sciences Edition, 2020, 42(3): 525-533. DOI: 10.7540/j.ynu.20190552

安徽省分地形小时极端降水气候分布特征

Climatic distribution characteristics of hourly extreme precipitation over different terrain areas in Anhui Province

  • 摘要: 使用安徽省1979—2015年国家级站点小时降水量资料,对安徽省小时极端降水的气候分布特征进行分析. 结果表明:①安徽省极端降水阈值由东北向西南呈现出“+ − +”三极分布,淮北北部地区的极端降水阈值较大,但发生概率稍低;而大别山区和江南西部山区极端降水频次和极端降水量均较强;②安徽省各站年均极端降水频次为4.25次/a,单站年均极端降水量为127 mm/a,极端降水频次、极端降水量和极端降水比率有明显的上升趋势;③将安徽省站点分为山地区域、山地北部过渡区以及平原和丘陵区域. 其中,极端降水频次在山区最高,平原和丘陵地区最少;而小时极端降水量在平原和丘陵地区最高,日变化幅度大;④安徽省极端降水大多发生于午后至晚间,过渡带地区极端降水频次集中度最高,日变化最显著. 不同地形区域内,极端降水较少的时段差异较大,自南向北极端降水减弱且单日内的时段逐渐后移.

     

    Abstract: The spatial and temporal distribution characteristics of hourly extreme precipitation in Anhui Province are analyzed, based on the data of hourly precipitation at national stations of Anhui Province from 1979 to 2015. The results show that: ① The extreme precipitation threshold in Anhui Province demonstrates a tripolar distribution pattern of ‘+ - +’ from Northeast to Southwest. The occurrence probability of extreme precipitation is low in the northern area of Huaibei but its intensity is strong. The frequency and amount of extreme precipitation are strong in the west of the south of the Yangtze River and Dabie Mountain area. ② The annual average frequency of extreme precipitation in Anhui Province is 4.25 times/a, and the average amount of extreme precipitation in a single station is 127 mm/a. The frequency, amount and ratio of extreme precipitations have an obvious upward trend. ③ The stations in Anhui Province are divided into mountainous regions, transitional regions to North of mountainous regions, and plain and hilly regions. The frequency of extreme precipitations in the mountainous areas is the highest, and the frequency in the plain and hilly areas is the lowest. But the amount of hourly extreme precipitation is the highest and the daily variation is the strongest in the plain and hilly areas. ④ Most of the extreme precipitations in Anhui Province occur from afternoon to night, the frequency concentration of extreme precipitations in the transitional zone is the highest, and the daily variation is the most significant. The periods with fewer extreme precipitations are quite different in different terrain areas, and the period of extreme precipitations abating in a single day gradually moves backward from South to North.

     

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