沙漠与绿洲气象2025，Vol.19Issue(3)：88-95,8.DOI:10.12057/j.issn.1002-0799.2310.17001
2016-2022年四川盆地东部极端降水特征
Characteristics of Extreme Precipitation in Eastern Sichuan Basin during 2016-2022
摘要
Abstract
Based on hourly precipitation data of 3 795 national and regional meteorological stations in the eastern Sichuan Basin from April to September from 2016-2022,this study used the percentile method to determine thresholds of extremely heavy precipitation at sub-daily scales(1,3,6,and 12 hours)for each station.The characteristics of extremely heavy precipitation at these sub-daily scales were then analyzed.The findings are summarized as follows:(1)Due to the diverse terrain and landforms of the region,there are significant spatial differences in extreme heavy rainfall areas at sub-daily scales.The average thresholds of the 98.5th percentile at 1,3,6,and 12 hours were 42,68,92 and 118 mm,respectively.(2)Short-term extreme heavy precipitation mainly occurred from June to August,peaking in July and followed by August.Regarding diurnal variations,extreme heavy rainfall was more likely to occur during in the second half of the night(02:00-08:00),and this pattern also existed in regional extreme rainfall events.(3)The central Sichuan and central and western Chongqing experienced high sub-daily-scale extreme heavy precipitation.The core areas of regional short-term extreme heavy rainfall events were concentrated from east Sichuan to western Chongqing.The key meteorological systems driving these events include the southwest vortex and surface cold fronts.(4)The threshold for extreme heavy precipitation at sub-daily scales increased from the surface to altitudes of 400-500 m,then generally decreased as altitude increased.Minor fluctuations in thresholds were observed near 800 and 1 500 meters.These results provide valuable insights into the spatial and temporal distribution of extreme heavy precipitation in the eastern Sichuan Basin,offering a foundation for improving monitoring and forecasting.关键词
区域气象站/极端强降水/气候特征Key words
regional meteorological station/extreme heavy precipitation/climatic characteristics分类
天文与地球科学引用本文复制引用
王中,李东川,王嘉佩..2016-2022年四川盆地东部极端降水特征[J].沙漠与绿洲气象,2025,19(3):88-95,8.基金项目
中国气象局创新发展专项(CXFZ2023J028) （CXFZ2023J028）
中国气象局创新发展专项(CXFZ2022J011) （CXFZ2022J011）
