气候变化领域集成服务门户(CCPortal): Stronger exacerbation of extreme rainfall at the hourly than daily scale by urbanization in a warming climate

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DOI	10.1016/j.jhydrol.2024.131025
	Stronger exacerbation of extreme rainfall at the hourly than daily scale by urbanization in a warming climate
	Deng, Zifeng; Wu, Xushu; Villarini, Gabriele; Wang, Zhaoli; Zeng, Zhaoyang; Lai, Chengguang
发表日期	2024
ISSN	0022-1694
EISSN	1879-2707
起始页码	633
卷号	633
英文摘要	Despite the substantial progress in understanding the response of extreme precipitation to climate warming across different time scales, the response of these events to urbanization remains uncertain. Here, we evaluate changes in hourly and daily extreme precipitation during 1981-2020 in the urbanized Pearl River Delta, China, using observations and numerical simulations. The results of observations show that hourly rather than daily extreme precipitation in urban areas is more intense and frequent than in rural ones. Hourly extreme intensity increases similar to 134 % faster than the daily one, and the urban downwind increase is most evident in hourly extreme precipitation frequency. The numerical simulations also show that the presence of urban areas increases hourly extreme intensity by similar to 26 %, but increases daily extreme intensity by only similar to 13 % when averaged over urban areas. The increases of precipitation intensities are local, and the increases across the whole region are much smaller than those over urban areas. Both observations and simulations indicate that urbanization exacerbates extreme precipitation and redistributes its spatial pattern, which is more pronounced at the hourly scale, potentially leading to a higher probability of hazardous urban flash floods. Our analysis of meteorological conditions elucidates that urban areas tend to create a drier and warmer surface environment and a more unstable atmosphere compared with surrounding rural areas. Moist air from surrounding rural areas is brought in to compensate for moisture anomalies and low pressure over the cities. This provides the air above urban areas with moisture, generating stronger updrafts, thus intensifying extreme precipitation over the cities. Urban areas provide a more favorable environment for the enhancement of hourly rather than daily extreme precipitation, and their differential responses to urbanization are mainly due to the mechanisms associated with enhancedClausius-Clapeyron behavior and the greater enhanced urban-rural thermal and moisture contrast in hourly extreme precipitation. Similarities can be found between the mechanisms of climate warming-induced and urban-induced intensification of localized hourly extreme precipitation Our results highlight the importance of understanding scale difference brought by urban environment, and thus provide a scale-based understanding of urban precipitation modification.
英文关键词	Extreme precipitation; Urbanization; Climate change; WRF
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:001202713000001
来源期刊	JOURNAL OF HYDROLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305026
作者单位	South China University of Technology; Princeton University; Princeton University; Pazhou Lab
推荐引用方式 GB/T 7714	Deng, Zifeng,Wu, Xushu,Villarini, Gabriele,et al. Stronger exacerbation of extreme rainfall at the hourly than daily scale by urbanization in a warming climate[J],2024,633.
APA	Deng, Zifeng,Wu, Xushu,Villarini, Gabriele,Wang, Zhaoli,Zeng, Zhaoyang,&Lai, Chengguang.(2024).Stronger exacerbation of extreme rainfall at the hourly than daily scale by urbanization in a warming climate.JOURNAL OF HYDROLOGY,633.
MLA	Deng, Zifeng,et al."Stronger exacerbation of extreme rainfall at the hourly than daily scale by urbanization in a warming climate".JOURNAL OF HYDROLOGY 633(2024).