在耦合建模框架中研究陆地-大气相互作用和反馈对灌溉空间表示的响应

IF 5.7 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
P. Lawston-Parker, Joseph A. Santanello Jr., N. Chaney
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引用次数: 0

摘要

摘要水、热量和动量从地表到大气的传输在一定程度上取决于陆地表面的特征。随着模型物理、参数化方案和参数的应用,陆地数据集确定了陆地表面状态(即土壤湿度和温度)和通量的空间变异性。尽管这些数据集很重要,但它们往往是出于方便或受区域限制而选择的,没有对其对模型结果的影响进行适当评估。灌溉是一种人为形式的土地异质性,已被证明会改变地表能量平衡、环境天气和局部环流。因此,随着数据可用性和参数化方案复杂性的快速发展,灌溉方案在天气和气候模型中越来越普遍。因此,为了解决与灌溉建模相关的实际问题,本研究使用高分辨率的区域耦合建模系统,利用大平原灌溉实验(GRAINEX)实地活动的一项案例研究,研究灌溉数据集选择对土地-大气(L–A)耦合的影响。模拟是在灌溉区域与非灌溉区域、灌溉梯度上的子区域以及粗尺度模型中的子网格尺度过程表示的背景下进行评估的。结果表明,L–A耦合对灌溉数据集和解决方案的选择很敏感,灌溉对地表通量和近地表气象的影响可能是主导的,取决于灌溉图的细节(例如边界和异质性),或者是最小的。几项分析的一致发现是,即使灌溉部分的比例很低(即4 %–16 %) 可能会对局部和下游大气产生重大影响(例如,较低的平面边界层、PBL、高度),这表明灌溉区域内边界和异质区域的代表性对于该模型中灌溉对大气的影响建模尤为重要。当将这里给出的模拟视为地球系统模型尺度网格框中“理想”瓷砖的近似值时,结果表明,一些“瓷砖”将达到临界非线性湿度和PBL阈值,这可能对云和对流很重要,这意味着在新的子网格L–A交换参数化中应考虑灌溉产生的异质性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the response of land–atmosphere interactions and feedbacks to spatial representation of irrigation in a coupled modeling framework
Abstract. The transport of water, heat, and momentum from the surface to the atmosphere is dependent, in part, on the characteristics of the land surface. Along with the model physics, parameterization schemes, and parameters employed, land datasets determine the spatial variability in land surface states (i.e., soil moisture and temperature) and fluxes. Despite the importance of these datasets, they are often chosen out of convenience or owing to regional limitations, without due assessment of their impacts on model results. Irrigation is an anthropogenic form of land heterogeneity that has been shown to alter the land surface energy balance, ambient weather, and local circulations. As such, irrigation schemes are becoming more prevalent in weather and climate models, with rapid developments in dataset availability and parameterization scheme complexity. Thus, to address pragmatic issues related to modeling irrigation, this study uses a high-resolution, regional coupled modeling system to investigate the impacts of irrigation dataset selection on land–atmosphere (L–A) coupling using a case study from the Great Plains Irrigation Experiment (GRAINEX) field campaign. The simulations are assessed in the context of irrigated vs. nonirrigated regions, subregions across the irrigation gradient, and sub-grid-scale process representation in coarser-scale models. The results show that L–A coupling is sensitive to the choice of irrigation dataset and resolution and that the irrigation impact on surface fluxes and near-surface meteorology can be dominant, conditioned on the details of the irrigation map (e.g., boundaries and heterogeneity), or minimal. A consistent finding across several analyses was that even a low percentage of irrigation fraction (i.e., 4 %–16 %) can have significant local and downstream atmospheric impacts (e.g., lower planetary boundary layer, PBL, height), suggesting that the representation of boundaries and heterogeneous areas within irrigated regions is particularly important for the modeling of irrigation impacts on the atmosphere in this model. When viewing the simulations presented here as a proxy for “ideal” tiling in an Earth-system-model-scale grid box, the results show that some “tiles” will reach critical nonlinear moisture and PBL thresholds that could be important for clouds and convection, implying that heterogeneity resulting from irrigation should be taken into consideration in new sub-grid L–A exchange parameterizations.
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来源期刊
Hydrology and Earth System Sciences
Hydrology and Earth System Sciences 地学-地球科学综合
CiteScore
10.10
自引率
7.90%
发文量
273
审稿时长
15 months
期刊介绍: Hydrology and Earth System Sciences (HESS) is a not-for-profit international two-stage open-access journal for the publication of original research in hydrology. HESS encourages and supports fundamental and applied research that advances the understanding of hydrological systems, their role in providing water for ecosystems and society, and the role of the water cycle in the functioning of the Earth system. A multi-disciplinary approach is encouraged that broadens the hydrological perspective and the advancement of hydrological science through integration with other cognate sciences and cross-fertilization across disciplinary boundaries.
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