Impacts of irrigation on a precipitation event during GRAINEX in the High Plains Aquifer Region
Impacts of irrigation on a precipitation event during GRAINEX in the High Plains Aquifer Region
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DOI：
10.1016/j.agrformet.2023.109854
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发表时间：
2024-02
影响因子：
6.2
通讯作者：
Daniel Whitesel;Rezaul Mahmood;Paul Flanagan;E. Rappin;U. Nair;R. A. Pielke Sr.;Michael Hayes
中科院分区：
文献类型：
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作者：
Daniel Whitesel;Rezaul Mahmood;Paul Flanagan;E. Rappin;U. Nair;R. A. Pielke Sr.;Michael Hayes
土地利用土地覆盖的变化，包括灌溉，影响天气和气候。本文对大平原灌溉试验（GRAINEX） 2018年7月23日上午发生的一次降水事件进行了研究。基于气象与研究预报（WRF）模型进行了6项试验，涉及灌溉农田土壤水分增加或减少5%至15%。这些变化近似于土壤含水量对不同灌溉水平的响应。另一项试验是将灌溉土地利用改为草地，以捕捉灌溉前的土地利用及其影响。结果表明，无论灌溉强度如何，降水都有所减少。此外，该模型没有计算出非灌溉土地上的降水。当草地取代灌溉农业时，估计降水增加。随着灌水量的增加，潜热通量较对照模拟增大，随灌水量的减少而减小。另一方面，随着灌水量的增加，感热通量比对照减小。灌溉土地利用的行星边界层比非灌溉土地利用的浅，草地土地利用的行星边界层比灌溉土地利用的高，但比非灌溉土地利用的低。降水、地表能量平衡和行星边界层的变化提醒人们灌溉对大气的复杂影响。对GRAINEX期间其他降水事件的进一步分析将有助于更好地了解灌溉的影响。
Land use land cover change, including irrigation, impacts weather and climate. In this paper a precipitation event that occurred on the morning of 23 July 2018 during the Great Plains Irrigation Experiment (GRAINEX) is investigated. Six Weather and Research Forecasting (WRF) model-based experiments were conducted, which involved the increase or decrease of soil moisture by 5 % and up to 15 % over the irrigated croplands. These changes approximated soil moisture content in response to different levels of irrigation applications. An additional experiment, where irrigated land use was changed to grassland, was conducted to capture pre-irrigation land use and its impacts. It was found that regardless of strength of irrigation, precipitation decreased. In addition, the model did not produce precipitation over non-irrigated land use. When grassland replaced irrigated agriculture, increases in precipitation were estimated. With increased irrigation, latent heat flux increased compared to the control simulation and decreased when irrigation decreased. On the other hand, sensible heat flux was decreased compared to control when irrigation increased. The planetary boundary layer over irrigated land use was shallower than over non-irrigated land use while over grassland it was higher than irrigated but lower than non-irrigated land use. The changes in precipitation, the surface energy balance, and the planetary boundary layer served as a reminder of irrigation's complex effects on the atmosphere. Additional analysis of other precipitation events during GRAINEX would be helpful to better understand the effects of irrigation.