Irrigation-induced decreases in reference evapotranspiration over the North China Plain

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Guoshuai Liu , Weiguang Wang , Hui Xu
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Abstract

As a pivotal factor influencing crop water requirement, reference evapotranspiration (ET0) plays a crucial role in agricultural water planning and management. Irrigation can exert distinct influences on ET0 by modifying meteorological conditions through land-atmosphere coupling. While the climatic effects of irrigation in the North China Plain (NCP), the most intensively irrigated area over China, have been explored, the specific impact of irrigation on ET0 remains unclear. To address this gap, we here employ a regional climate model coupled with a well-validated irrigation scheme to perform idealized simulations to investigate the responding behaviors of ET0 to irrigation in the NCP from 2005 to 2014. We find that the incorporation of irrigation notably enhances the model performance in modeling ET0 in the NCP. Irrigation induces an ET0 decrease of −0.32 mm day−1 (−29.4 mm year−1) in spring and −0.38 mm day−1 (−35.0 mm year−1) in summer and an actual evapotranspiration (ETa) increase of 0.49 mm day−1 (45.1 mm year−1) in spring and 0.40 mm day−1 (36.8 mm year−1) in summer, respectively. The irrigation-induced changes in ET0 and ETa adhere to the complementary principle, which stems from the land-atmosphere coupling. The decline in ET0 is attributed to decreases in surface air temperature and wind speed, coupled with an increase in relative humidity due to irrigation, with the latter playing a paramount role. Furthermore, irrigation decouples the relationship between precipitation and ETa and weakens the traditional dependence of ETa on local precipitation. This study underscores that the related change in ET0 due to the climate feedbacks of irrigation should be taken into account in agricultural water planning and management.
灌溉引起的华北平原参考蒸散量减少
作为影响作物需水量的关键因素,参考蒸散量(ET0)在农业用水规划和管理中起着至关重要的作用。灌溉可通过土地-大气耦合改变气象条件,从而对 ET0 产生明显影响。华北平原是中国灌溉最密集的地区,虽然灌溉对该地区气候的影响已得到探讨,但灌溉对 ET0 的具体影响仍不清楚。针对这一空白,我们采用区域气候模式,结合经过验证的灌溉方案,对华北平原 2005 年至 2014 年的灌溉对 ET0 的响应行为进行了理想化模拟研究。我们发现,灌溉的加入显著提高了模型在模拟北太平洋地区 ET0 时的性能。灌溉分别导致春季蒸散发减少-0.32毫米/天-1(-29.4毫米/年-1)和夏季蒸散发减少-0.38毫米/天-1(-35.0毫米/年-1),以及春季实际蒸散发(ETa)增加0.49毫米/天-1(45.1毫米/年-1)和夏季实际蒸散发增加0.40毫米/天-1(36.8毫米/年-1)。灌溉引起的 ET0 和 ETa 的变化遵循互补原则,该原则源于陆地-大气耦合。ET0 的下降归因于地表气温和风速的下降,以及灌溉导致的相对湿度的增加,后者起着至关重要的作用。此外,灌溉使降水与蒸散发之间的关系脱钩,削弱了蒸散发对当地降水的传统依赖性。这项研究强调,在农业用水规划和管理中应考虑到灌溉的气候反馈引起的 ET0 的相关变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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