沙漠与绿洲气象2024，Vol.18Issue(3)：69-77,9.DOI:10.12057/j.issn.1002-0799.2024.03.010
1981-2020年沂沭河流域极端降水事件特征及环流背景
Characteristics of Extreme Precipitation Events and Circulation Background in the Yishuhe River Basin from 1981 to 2020
摘要
Abstract
Based on the observed daily precipitation data of 12 meteorological stations in the Yishuhe River Basin from 1981 to 2020,the Western Pacific subtropical high(WPSH)index,Pacific Decadal Oscillation(PDO)data,and NCEP/NCAR daily reanalysis data,the spatial and temporal variation characteristics of the extreme precipitation events in the Yishuhe River Basin were studied by using statistical analysis,composite analysis,and other methods.The correlation between the extreme precipitation index and climate factors,and the abnormal circulation background of extreme precipitation events were further studied.The results show as follows:The extreme precipitation events in the Yishuhe River Basin have shown an overall increasing trend in frequency and intensity,becoming more severe over time.Spatially,these events are more frequent in the southern region compared to the northern region,with the central and northern regions experiencing a higher growth rate than the south.The frequency and annual amount of extreme precipitation exhibit abrupt increases around 1989 and 2002,while the intensity of extreme precipitation increases in 1989 and decreases around 2000.The frequency,intensity,and annual amount of extreme precipitation are mainly fluctuating in the quasi-period of 22,10,and 22 years.The WPSH ridge line is positively correlated with the frequency and annual amount of extreme precipitation,while PDO is negatively correlated.The intensity of the East Asian summer monsoon and the anomalous position of the WPSH are important factors influencing extreme precipitation events in the Yishuhe River Basin,which can be used as references for forecasting extreme precipitation in the region.关键词
沂沭河流域/极端降水事件/时空分布/环流特征Key words
Yishuhe River Basin/extreme precipitation events/spatial and temporal distribution/characteristics of circulation分类
天文与地球科学引用本文复制引用
刘婷婷,申高航,谢晓华..1981-2020年沂沭河流域极端降水事件特征及环流背景[J].沙漠与绿洲气象,2024,18(3):69-77,9.基金项目
中国沙漠气象科学研究基金项目(Sqj2018007) （Sqj2018007）
临沂市气象局气象科学技术研究项目(2022lyqx13) （2022lyqx13）
