CHEN Miaolin,MAO Wenshu,SHI Chunxiang,et al.Characteristics of Hourly Extreme Precipitation in Southwest China from May to September from 1991 to 2020[J].Journal of Chengdu University of Information Technology,2022,37(04):435-441.[doi:10.16836/j.cnki.jcuit.2022.04.012]
1991-2020年西南湿季小时极端降水特征与区域差异
- Title:
- Characteristics of Hourly Extreme Precipitation in Southwest China from May to September from 1991 to 2020
- 文章编号:
- 2096-1618(2022)04-0435-07
- Keywords:
- meteorology; hourly extreme precipitation; percentile method; climate tendency rate; Southwest region
- 分类号:
- P426.62
- 文献标志码:
- A
- 摘要:
- 为研究西南地区小时极端降水特征，利用西南地区1991-2020年5-9月的逐小时降水数据，采用第97百分位阈值法，对西南小时极端降水的空间分布和时间变化特征进行分析。结果表明:(1)小时极端降水阈值空间分布差异较大，从西北川西高原地区的4～5 mm/h向东南的云南东南部和贵州南部递增至10～15 mm/h; 3个小时极端降水量大值中心分别位于四川盆地西部—川西高原过渡带、云南南部和贵州南部地区，达300 mm以上。(2)多年平均的小时极端夜雨量集中在四川盆地西部—川西高原的过渡带和贵州西南部地区; 小时极端昼雨量集中在云南南部，呈带状分布。(3)四川、重庆、云南、贵州小时极端降水频数的变化趋势与小时极端降水量相对一致，在四川地区为单峰型，存在显著的夜雨特征，而重庆、贵州和云南地区均为双峰型。(4)西南各区域小时极端降水量与小时极端降水频数的变化趋势较为一致，增加时次多集中在后半夜与白天。
- Abstract:
- In order to study the characteristics of hourly extreme precipitation in Southwest China, the spatial distribution and temporal variation characteristics of hourly extreme precipitation in Southwest China were analyzed by using the 97th percentile threshold method based on the hourly precipitation data from May to September from 1991 to 2020.The results show that:(1)the threshold of hourly extreme precipitation varied greatly in spatial distribution, increasing from 4-5 mm/h in western Sichuan plateau to 10-15 mm/h in southeastern Yunnan and southern Guizhou. The three high value centers of hourly extreme precipitation were located in the transitional zone of western Xichuan Basin and western Sichuan Plateau, southern Yunnan and southern Guizhou respectively, reaching more than 300 mm. (2)The annual average hourly extreme night rainfall is mainly in transitional zone between western Sichuan Basin and western Sichuan Plateau and the southwestern region of Guizhou. (3)The variation trend of hourly extreme precipitation frequency in Sichuan, Chongqing, Yunnan and Guizhou regions is relatively consistent with that of hourly extreme precipitation. In Sichuan province, there is a single peak pattern, and there is a significant night rain pattern, while in Chongqing, Guizhou and Yunnan regions, there is a double peak pattern. (4)The variation trend of hourly extreme precipitation and hourly extreme precipitation frequency in each region of southwest China is consistent, and the increasing times are mainly concentrated in the latter half of night and daytime.
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备注/Memo
收稿日期:2021-08-09
基金项目: 国家重点研发计划资助项目(2018YFC1506601); 国家国际科技合作基金资助项目(2011DFG23150); 国家自然科学基金重点资助项目(91437220)