Spatial patterns of short-term extreme precipitation and their causes

Zuo, Daxing1; Wu, Chunyi2; Wu, Lichuan3; Zheng, Yanhui4,5; Chen, Xiaohong6,7,8; Wang, Lina1; Zang, Chuanfu1

2024-07-01

10.1002/hyp.15227

HYDROLOGICAL PROCESSES   影响因子和分区

0885-6087

1099-1085

["The spatial distribution of extreme precipitation significantly affects flow-producing processes and flooding. Previous studies on heavy rainfall have mainly emphasized the temporal distribution characteristics, with little emphasis on rainfall spatial patterns. We objectively classified 3-h scale extreme precipitation spatial patterns (EPSPs) in Guangdong Province, China. We calculated the importance of the influencing factors on EPSPs, analysed weather backgrounds corresponding to various EPSPs, and explained the causes of extreme precipitation. We found that the incidence of most EPSPs increased significantly over this 40-year period, and this increase has been particularly pronounced since the beginning of the 21st century. The Pacific Decadal Oscillation (PDO) was found to be the main factor influencing the extreme precipitation events (EPEs) in western Guangdong, and the weakening of the PDO contributed to the occurrence of EPEs in these areas. Urbanization was the main factor contributing to the increase in EPEs in the southern and coastal areas of Guangdong. The EPSPs in central Guangdong were caused by a southwest jet stream and topographic uplift. Extreme precipitation in southern and coastal Guangdong was mainly triggered by the convergent shear of southwesterly winds. The EPSPs over western Guangdong were caused by the low vortex in western Guangdong and the influx of large amounts of water vapour from the southern ocean. This study has provided new ideas for the study of the formation process and mechanism of localized heavy precipitation as well as an important reference for the simulation of runoff in coastal areas.","Short-term extreme precipitation (SEP) has become more frequent in Guangdong Province over the past 40 years. The weakening of the PDO and urbanization were the main factor for the increase of SEP in Guangdong. SEP in the central part of Guangdong was caused by the southwesterly jet stream and topographic uplift, while the southern part SEP was caused by convergent shear of the southwesterly winds, and the western part SEP was caused by the low vortex and water vapour influx. image"]

extreme precipitation event Guangdong Province precipitation spatial patterns self-organizing map neural network weather background

SCI ; EI

英语

其他

National Key Research and Development Program of China[2021YFC3001000] ; National Natural Science Foundation of China["U1911204","52209025","1501021"]

Water Resources

Water Resources

WOS:001268234600001

WILEY

20242816687168

Coastal zones ; Conformal mapping ; Self organizing maps

Precipitation:443.3 ; Marine Science and Oceanography:471

ENVIRONMENT/ECOLOGY

Web of Science

1.South China Normal Univ, Sch Geog, Guangzhou 510631, Peoples R China
2.Minist Water Resources, Bur Hydrol, Pearl River Resources Commisson, Guangzhou, Peoples R China
3.Uppsala Univ, Dept Earth Sci, Uppsala, Sweden
4.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen, Peoples R China
5.Franzero Water Technol Co LTD, Guangzhou, Peoples R China
6.Sun Yat Sen Univ, Ctr Water Resources & Environm, Guangzhou, Peoples R China
7.Sun Yat Sen Univ, Guangdong Engn Technol Res Ctr Water Secur Regulat, Guangzhou, Peoples R China
8.Sun Yat Sen Univ, Guangdong High Educat Inst, Key Lab Water Cycle & Water Secur Southern China, Guangzhou, Peoples R China

Zuo, Daxing,Wu, Chunyi,Wu, Lichuan,et al. Spatial patterns of short-term extreme precipitation and their causes[J]. HYDROLOGICAL PROCESSES,2024,38(7).

Zuo, Daxing.,Wu, Chunyi.,Wu, Lichuan.,Zheng, Yanhui.,Chen, Xiaohong.,...&Zang, Chuanfu.(2024).Spatial patterns of short-term extreme precipitation and their causes.HYDROLOGICAL PROCESSES,38(7).

Zuo, Daxing,et al."Spatial patterns of short-term extreme precipitation and their causes".HYDROLOGICAL PROCESSES 38.7(2024).