气候变化领域集成服务门户(CCPortal): Irrigation-Induced Potential Evapotranspiration Decrease in the Heihe River Basin, Northwest China, as Simulated by the WRF Model

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DOI	10.1029/2019JD031058
	Irrigation-Induced Potential Evapotranspiration Decrease in the Heihe River Basin, Northwest China, as Simulated by the WRF Model
	Zhang X.; Ding N.; Han S.; Tang Q.
发表日期	2020
ISSN	2169897X
卷号	125 期号:2
英文摘要	Evapotranspiration occurs via land-atmosphere coupling. To understand the impacts of irrigation on local potential evapotranspiration, we carried out a couple of simulations with the Weather Research and Forecast (WRF) model, where an irrigation scheme was incorporated, for the irrigated area in the middle reaches of the Heihe River, Northwest China. By comparing the irrigation simulation (hereafter, the IRRG case) with the simulation excluding irrigation (hereafter, the NATU case), we found that irrigation may lead to a decrease in reference evapotranspiration (ET0) during the growing season (May to September), which is a metric of potential evapotranspiration, by approximately 1.05 mm d−1, accounting for approximately 19% of NATU ET0. The ET0 in the IRRG is closer to the ground measurements than the NATU ET0, with a root-mean-square error of 0.75 mm d−1 in the IRRG and 1.86 mm d−1 in the NATU cases. Meanwhile, irrigation leads to an actual evapotranspiration (ETa) increase of approximately 2.1 mm d−1 for croplands. Such an asymmetric relationship between ET0 decrease and ETa increase was found over the irrigated croplands. The ET0 decrease was mainly induced by the moistening and cooling effects of irrigation through intensified evapotranspiration and reduced sensible heat. This study highlights the importance of considering land-atmosphere coupling when assessing the impacts of climatic change on irrigation water requirements. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Heihe River Basin (HRB); irrigation; land-atmosphere coupling; potential evapotranspiration
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186227
作者单位	Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; School of Geography, Geomatics and Planning, Jiangshu Normal University, Xuzhou, China; State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China; Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Zhang X.,Ding N.,Han S.,et al. Irrigation-Induced Potential Evapotranspiration Decrease in the Heihe River Basin, Northwest China, as Simulated by the WRF Model[J],2020,125(2).
APA	Zhang X.,Ding N.,Han S.,&Tang Q..(2020).Irrigation-Induced Potential Evapotranspiration Decrease in the Heihe River Basin, Northwest China, as Simulated by the WRF Model.Journal of Geophysical Research: Atmospheres,125(2).
MLA	Zhang X.,et al."Irrigation-Induced Potential Evapotranspiration Decrease in the Heihe River Basin, Northwest China, as Simulated by the WRF Model".Journal of Geophysical Research: Atmospheres 125.2(2020).