气候变化领域集成服务门户(CCPortal): Spring Irrigation Reduces the Frequency and Intensity of Summer Extreme Heat Events in the North China Plain

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DOI	10.1029/2023GL107094
	Spring Irrigation Reduces the Frequency and Intensity of Summer Extreme Heat Events in the North China Plain
	Liu, Guoshuai; Wang, Weiguang; Xu, Hui
发表日期	2024
ISSN	0094-8276
EISSN	1944-8007
起始页码	51
结束页码	5
卷号	51 期号:5
英文摘要	Irrigation has distinct impacts on extreme temperatures. Due to the carryover effect of soil moisture into other seasons, temperature impacts of irrigation are not limited to irrigated seasons. Focusing on the North China Plain, where irrigation occurs in both spring (March-April-May) and summer (June-July-August), with a higher proportion of irrigation water applied during spring, we investigate the impact of spring irrigation on summer extreme heat events. Based on partial correlation analysis of data products, we find positive correlations between spring and summer soil moisture, suggesting that spring irrigation-induced water surplus persists into the following summer and affects regional climate by impacting surface energy partitioning. Regional climate simulations confirm cross-seasonal climatic effects and show that spring irrigation reduces the frequency and intensity of summer extreme heat events by approximately -2.5 days and -0.29 degrees C, respectively. Our results highlight the importance of the cross-seasonal climatic effect of irrigation in mitigating climate extremes. Irrigation exerts a stronger impact on extreme temperatures than on mean temperatures. The North China Plain (NCP) is a typical winter wheat-summer maize rotation planting area, where irrigation is necessary in both spring and summer, but with a higher proportion of irrigation water applied during spring. The climatic effects of spring and summer irrigation in the NCP are intertwined due to the carryover effects of soil moisture. Recently, the climatic effect of irrigation in the NCP has been extensively explored, whereas the cross-seasonal effects of irrigation on summer extreme heat events have never been quantified. In this study, we employ the Weather Research and Forecasting model coupled with a demand-driven irrigation algorithm to discern the effects of spring and/or summer irrigation on summer extreme heat events by means of idealized climate simulations. The results show that spring and summer irrigation significantly reduces the frequency and intensity of summer extreme heat events by approximately -6.5 days and -1.0 degrees C, of which spring irrigation contributes about 38% and 30%, respectively. Our findings underline the importance of irrigation-induced climate impacts in mitigating extreme heat events and emphasize that climate change adaptation planning in terms of irrigation must account for cross-seasonal climatic effects. Effect of multi-seasonal irrigation on summer extreme heat events is investigated Spring irrigation is beneficial for reducing summer extreme heat events Irrigation modulates the relationship between spring and summer soil moisture
英文关键词	agricultural irrigation; extreme temperatures; numerical simulation; evaporative cooling; cross-seasonal effects
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001176348100001
来源期刊	GEOPHYSICAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306143
作者单位	Hohai University; Hohai University; Hohai University; Hohai University; Hohai University
推荐引用方式 GB/T 7714	Liu, Guoshuai,Wang, Weiguang,Xu, Hui. Spring Irrigation Reduces the Frequency and Intensity of Summer Extreme Heat Events in the North China Plain[J],2024,51(5).
APA	Liu, Guoshuai,Wang, Weiguang,&Xu, Hui.(2024).Spring Irrigation Reduces the Frequency and Intensity of Summer Extreme Heat Events in the North China Plain.GEOPHYSICAL RESEARCH LETTERS,51(5).
MLA	Liu, Guoshuai,et al."Spring Irrigation Reduces the Frequency and Intensity of Summer Extreme Heat Events in the North China Plain".GEOPHYSICAL RESEARCH LETTERS 51.5(2024).