Climate Change Increases Evaporative and Crop Irrigation Demand in North America

IF 7.3 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Earths Future Pub Date : 2025-07-02 DOI:10.1029/2025EF005931
Emily L. Williams, John T. Abatzoglou
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引用次数: 0

Abstract

Across North America, warmer temperatures have increased reference evapotranspiration (ETo), taxing water resources. This problem is especially pronounced for semi-arid regions with large amounts of irrigated agriculture, such as California's Central Valley. In this region, increased ETo has increased irrigation demand, but the role of anthropogenic climate change (ACC) in driving this increase has not yet been quantified. Here, we quantified the influence of ACC on ETo and how these changes have translated into increased irrigation demand. We calculated observational ETo from ERA5-Land and counterfactual ETo that removes the forced changes simulated by 20 models from the Coupled Model Intercomparison Project Phase 6 from the observational records. At the scale of North America, we found that ACC drove a 64 mm increase in annual ETo from 1980 to 2022, compared to the observed 54 mm increase. The largest observed increases in ETo were found in the southwestern and central regions, where ACC has likely exacerbated trends linked to natural climate variability. The largest ACC contributor to increased ETo was increased vapor pressure deficit, while decreased solar radiation has tempered increased ETo. Finally, we found that ACC has increased annual crop irrigation demand in the Central Valley by 0.76 km3 during 1980–2022, with cumulative increased irrigation demand of 9.2 km3, equivalent to ∼11% of the region's groundwater loss during this time. Our findings suggest that ACC is accelerating demand for water in this already water-limited region, and this phenomenon is likely occurring in other semi-arid agricultural regions of North America.

Abstract Image

气候变化增加了北美的蒸发和作物灌溉需求
在整个北美,气温升高增加了参考蒸散量(ETo),对水资源造成了负担。这个问题在拥有大量灌溉农业的半干旱地区尤其明显,比如加州的中央山谷。在该地区,ETo的增加增加了灌溉需求,但人为气候变化(ACC)在推动这一增长中的作用尚未被量化。在这里,我们量化了ACC对ETo的影响,以及这些变化如何转化为灌溉需求的增加。我们计算了ERA5-Land的观测ETo和从观测记录中去除耦合模式比对项目第6阶段20个模式模拟的强迫变化的反事实ETo。在北美的尺度上,我们发现从1980年到2022年,ACC驱动的年ETo增加了64 mm,而观测到的年ETo增加了54 mm。观测到的ETo增幅最大的是西南和中部地区,在这些地区,ACC可能加剧了与自然气候变率相关的趋势。ACC对ETo增加的最大贡献是蒸汽压赤字的增加,而太阳辐射的减少缓和了ETo的增加。最后,我们发现,在1980-2022年期间,ACC使中央山谷的年作物灌溉需求增加了0.76 km3,累计增加的灌溉需求为9.2 km3,相当于该地区在此期间地下水损失的11%。我们的研究结果表明,ACC正在加速这个已经缺水的地区对水的需求,这种现象很可能发生在北美其他半干旱的农业地区。
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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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